CN217282934U - Radio frequency front end module and system - Google Patents

Description

A radio frequency front-end module and system

technical field

The utility model relates to the technical field of communications, in particular to a radio frequency front-end module and a system.

Background technique

As mobile communications enter the 5G NR era, three new frequency bands have been added to the 5G and 6G frequency ranges, including n77 (3300-4200MHz), n78 (3300-3800MHz) and n79 (4400-5000MHz).

From the perspective of the number of transceiver antennas, there are mainly three types of RF front-end solutions in the prior art: 1T2R, 1T4R and 2T4R, where T represents the transmitting antenna and corresponding circuit, and R represents the receiving antenna and corresponding circuit. For wireless terminals that support 5G NR, the 1T2R scheme is used in the low frequency range (less than 960MHz, such as B5/8, etc.); the 1T4R scheme is mainly used in the intermediate frequency (1700-2180MHz), high frequency (2300-2690MHz) and new frequency bands (n77) /78/79); 2T4R scheme is mainly used for n41/77/78/79. The RF solution that combines the existing frequency band (ie, the re-farming frequency band) and the newly added frequency band increases the design complexity of the RF front-end module and circuit.

The existing solution is relatively complex, requires more devices, increases the circuit cost and size, and cannot realize mutual switching between any ports. Therefore, an RF front-end module with high integration is urgently needed.

Utility model content

The purpose of the present invention is to provide a radio frequency front-end module and system in view of the above-mentioned deficiencies in the prior art, so as to solve the problems in the prior art that the solution is relatively complicated and the ports cannot be switched freely.

To achieve the above purpose, the technical solutions adopted in the embodiments of the present application are as follows:

In a first aspect, an embodiment of the present application provides a radio frequency front-end module, the radio frequency front-end module includes: multiple groups of radio frequency channels and antenna switches, wherein each group of radio frequency channels includes: radio frequency processing circuits of multiple frequency bands, each The first end of the radio frequency processing circuit of the frequency band is used to connect the corresponding radio frequency interface on the radio frequency transceiver, and the second end of the radio frequency processing circuit of the multiple frequency bands is connected to the multiple connection ends of the first side in the antenna switch, so the The multiple connection terminals on the second side of the antenna switch are respectively used to connect multiple antenna units in the antenna module.

Optionally, the multiple groups of radio frequency channels include: multiple radio frequency transceiver channels, wherein each radio frequency transceiver channel includes: a transceiver processing circuit of the multiple frequency bands, a multi-band combiner, and a coupler;

The first end of the transceiver processing circuit of each frequency band is used to connect the transmitting interface and the receiving interface of the corresponding frequency band on the radio frequency transceiver, and the second end of the transceiver processing circuit of the multiple frequency bands is connected to the multi-band combiner. The first ends corresponding to the multiple frequency bands, the second end of the multi-band combiner is connected to the first target connection end of the first side on the antenna switch through the coupler, and the first target The connection end is the connection end corresponding to the transceiver antenna unit in the antenna module.

Optionally, the transceiver processing circuit of the first frequency band in the plurality of frequency bands includes: a power amplifier, a low noise amplifier, and a switch;

The input end of the power amplifier is used to connect to the transmitting interface of the first frequency band in the radio frequency transceiver, the output end of the power amplifier is connected to the first end of the switch, and the output end of the low noise amplifier is used for is connected to the receiving interface of the first frequency band in the radio frequency transceiver, the input end of the low noise amplifier is connected to the second end of the switch, and the third end of the switch is connected to the multi-band combiner the connection terminal corresponding to the first frequency band.

Optionally, a bandpass filter corresponding to the first frequency band is integrated in the multi-band combiner.

Optionally, the transceiver processing circuit of the second frequency band in the plurality of frequency bands includes: a power amplifier, a low noise amplifier, a plurality of duplexers, a plurality of transmit filters, a plurality of receive filters, a single frequency band combiner, a first switch, a second switch and a third switch;

The input end of the power amplifier is used to connect to the transmitting interface of the second frequency band in the radio frequency transceiver, the output end of the power amplifier is connected to one end of the first switch, and multiple other ends of the first switch are connected. one end is respectively connected to one connection end of the third switch on the first side through the plurality of transmit filters;

The output end of the low-noise amplifier is used to connect to the receiving interface of the second frequency band in the radio frequency transceiver, the input end of the low-noise amplifier is connected to one end of the second switch, and the multiple terminals of the second switch are connected. The other ends of the third switches are respectively connected to the plurality of connection ends of the third switch on the first side through the plurality of receiving filters;

The two connecting ends of the third switch on the second side are respectively connected to the two connecting ends on the first side of the single-band combiner, and the connecting ends of the single-band combiner on the second side are connected to the A connection end corresponding to the second frequency band on the multi-band combiner.

Optionally, a low-pass filter corresponding to the second frequency band is integrated in the multi-band combiner.

Optionally, the multiple groups of radio frequency channels include: multiple radio frequency receiving channels, wherein each radio frequency receiving channel includes: receiving and processing circuits of multiple frequency bands and a multi-band combiner;

The first end of the receiving processing circuit of each frequency band is used to connect to the receiving interface of the corresponding frequency band on the radio frequency transceiver, and the second end of the receiving processing circuit of the multiple frequency bands is connected to all of the multi-band combiners. the first terminals corresponding to the multiple frequency bands, the second terminal of the multi-band combiner is connected to the second target connection terminal on the first side of the antenna switch, and the second target connection terminal is the antenna The connection terminal corresponding to the receiving antenna unit in the module.

Optionally, the receiving and processing circuit of the first frequency band in the plurality of frequency bands includes: a low noise amplifier;

The output end of the low-noise amplifier is used to connect to the receiving interface of the first frequency band in the radio frequency transceiver, and the input end of the low-noise amplifier is connected to the multi-band combiner corresponding to the first frequency band. first end.

Optionally, the receiving processing circuit of the second frequency band in the plurality of frequency bands includes: a low noise amplifier, a plurality of receiving filters, a single frequency band combiner, a first switch and a second switch;

The output end of the low noise amplifier is used to connect to the receiving interface of the second frequency band in the radio frequency transceiver, the input end of the low noise amplifier is connected to one end of the first switch, and the multiple terminals of the first switch are connected. The other ends of the second switches are respectively connected to the plurality of connection ends of the second switch on the first side through the plurality of receiving filters;

The two connecting ends of the second switch on the second side are respectively connected to the two connecting ends on the first side of the single-band combiner, and the connecting ends of the single-band combiner on the second side are connected to the A connection end corresponding to the second frequency band on the multi-band combiner.

In a second aspect, an embodiment of the present application provides a radio frequency system, including: a radio frequency front-end module, a radio frequency transceiver, and an antenna module according to any one of the above-mentioned first aspects;

The multiple radio frequency interfaces on the radio frequency transceiver are respectively connected to the radio frequency processing circuits of multiple frequency bands in each group of radio frequency channels in the radio frequency front-end module, and the antenna switches in the radio frequency front-end module are connected to the radio frequency processing circuits in the antenna module. multiple antenna units.

Compared with the prior art, the present application has the following beneficial effects:

A radio frequency front-end module and system provided by an embodiment of the present application, the radio frequency front-end module includes: multiple groups of radio frequency channels and antenna switches, wherein each group of radio frequency channels includes: multiple frequency bands of radio frequency processing circuit, the first end of the radio frequency processing circuit of each frequency band is used to connect the corresponding radio frequency interface on the radio frequency transceiver, the second end of the radio frequency processing circuit of multiple frequency bands is connected to the multiple connection ends of the first side in the antenna switch, the antenna The multiple connection terminals on the second side of the switch are respectively used for connecting multiple antenna units in the antenna module. Therefore, through the connection relationship between multiple groups of radio frequency channels and antenna switches, the port switching function of the radio frequency front-end module is expanded, the structural complexity of the radio frequency front-end module is reduced, and the cost of the radio frequency front-end module is reduced.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings that need to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention. Therefore, it should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained from these drawings without any creative effort.

1 is a schematic structural diagram of a radio frequency front-end module according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a radio frequency transceiver channel provided by an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a transceiver processing circuit provided by an embodiment of the present application;

FIG. 4 is a schematic structural diagram of another transceiver processing circuit provided by an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a radio frequency receiving channel provided by an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a receiving and processing circuit provided by an embodiment of the present application;

FIG. 7 is a schematic structural diagram of another receiving and processing circuit provided by an embodiment of the present application;

8 is a schematic structural diagram of a radio frequency system;

FIG. 9 is a schematic structural diagram of a 2T4R radio frequency front-end module provided by an embodiment of the present application.

Icons: 100-RF front-end module, 200-RF transceiver, 300-Antenna module, 110-RF channel, 120-Antenna switch, 111-Transceiver processing circuit, 112-Multi-band combiner, 113-Coupler, 114 - Power Amplifier, 115-Low Noise Amplifier, 116-Switch, 117-Duplexer, 118-Transmit Filter, 119-Receive Filter, 121-Single Band Combiner, 122-First Switch, 123-Second Switch, 124-third switch, 125-receive processing circuit.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described implementation Examples are some, but not all, embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In addition, where the terms "first", "second" and the like appear, they are only used to differentiate the description, and should not be construed as indicating or implying relative importance.

It should be noted that the features in the embodiments of the present invention may be combined with each other under the condition of no conflict.

In order to improve the integration degree of the radio frequency front-end module, the present application provides a radio frequency front-end module and system, which can reduce the cost of the radio frequency front-end module while improving the integration degree of the radio frequency front-end module. A radio frequency front-end module provided by the embodiment of the present application is explained below through specific examples.

FIG. 1 is a schematic structural diagram of a radio frequency front-end module according to an embodiment of the present application. As shown in Figure 1, the RF front-end module includes: multiple groups of RF channels and antenna switches.

Wherein, each group of radio frequency channels 110 includes: radio frequency processing circuits of multiple frequency bands, the first end of the radio frequency processing circuit of each frequency band is used to connect the corresponding radio frequency interface on the radio frequency transceiver 200, and the first end of the radio frequency processing circuit of multiple frequency bands is used to connect Both terminals are connected to the multiple connection terminals on the first side of the antenna switch 120 , and the multiple connection terminals on the second side of the antenna switch 120 are respectively used to connect multiple antenna units in the antenna module 300 .

Multiple groups of radio frequency channels 110 can implement radio frequency transmission/reception, and are connected to multiple antenna units through the antenna switch 120 . For example, the number of groups of radio frequency channels 110 is consistent with the number of antenna units. If the number of groups of radio frequency channels 110 and the number of antenna units are both N, then the antenna switch 120 is an NPNT switch (multi-pole multi-throw switch), Among them, N is a positive integer greater than or equal to 2. The NPNT antenna switch 120 can realize any connection between the N input pins and the N output pins, so as to realize the antenna selection and switching functions. Each antenna unit in the antenna unit is connected to expand the port switching function of the RF front-end module. In addition, multiple groups of radio frequency channels are connected to multiple antenna units through one NPNT switch, which reduces the structural complexity of the radio frequency front-end module and reduces the cost of the radio frequency front-end module.

Exemplarily, the plurality of frequency bands include frequency bands in signals such as 2G, 3G, 4G, 5G, and 6G, for example, frequency bands such as n77 (3300-4200MHz), n78 (3300-3800MHz), and n79 (4400-5000MHz). However, this application does not limit the specific frequency band range, and may also be other communication frequency bands.

To sum up, a radio frequency front-end module provided by an embodiment of the present application includes: multiple sets of radio frequency channels and antenna switches, wherein each set of radio frequency channels includes: radio frequency processing circuits of multiple frequency bands, and a radio frequency processing circuit of each frequency band. The first end of the radio frequency processing circuit is used to connect to the corresponding radio frequency interface on the radio frequency transceiver, and the second end of the radio frequency processing circuit of multiple frequency bands is connected to the multiple connection ends of the first side of the antenna switch, and the second end of the antenna switch The multiple connection ends are respectively used for connecting multiple antenna units in the antenna module. Therefore, through the connection relationship between multiple groups of radio frequency channels and antenna switches, the port switching function of the radio frequency front-end module is expanded, the structural complexity of the radio frequency front-end module is reduced, and the cost of the radio frequency front-end module is reduced.

FIG. 2 is a schematic structural diagram of a radio frequency transceiver channel provided by an embodiment of the present application. As shown in FIG. 2 , the multiple groups of radio frequency channels include: multiple radio frequency transceiver channels, wherein each radio frequency transceiver channel includes: multiple frequency band transceiver processing circuits, multi-frequency band combiners, and couplers.

The first end of the transceiver processing circuit 111 of each frequency band is used to connect the transmit interface and the receive interface of the corresponding frequency band on the radio frequency transceiver, and the second end of the transceiver processing circuit 111 of multiple frequency bands is connected to multiple frequency bands in the multi-band combiner 112 The corresponding first end, the second end of the multi-band combiner 112 is connected to the first target connection end on the first side of the antenna switch 120 through the coupler 113, and the first target connection end is the connection corresponding to the transceiver antenna unit in the antenna module. end.

Each of the multiple radio frequency transceiver channels can both transmit radio frequency signals and receive radio frequency signals. The multi-band combiner 112 combines the signals of multiple frequency bands input by the multiple radio frequency transceiver channels to output, and the multi-band combiner 112 has connection terminals corresponding to the multiple frequency bands. The coupler 113, also known as a power distribution component, can couple a multi-mode signal into a single-mode signal, for example, couple a radio frequency transmit signal and a radio frequency receive signal into one signal. The radio frequency signal is transmitted to the antenna unit through the transceiver processing circuit 111 , the multi-band combiner 112 , the coupler 113 and the antenna switch 120 for transmission. receive radio frequency signals. By setting a combiner and a coupler, the multi-channel multi-band transceiver signals can be coupled to realize the common input or output of the multi-channel signals, which reduces the number of components and reduces the structural complexity in the RF transceiver channel. Reduce the cost of RF front-end modules.

To sum up, in this embodiment, the multiple groups of radio frequency channels include: multiple radio frequency transceiver channels, wherein each radio frequency transceiver channel includes: a transceiver processing circuit of multiple frequency bands, a multi-band combiner, and a coupler; each frequency band The first end of the transceiver processing circuit is used to connect the transmitting interface and the receiving interface of the corresponding frequency band on the radio frequency transceiver, and the second end of the transceiver processing circuit of multiple frequency bands is connected to the first end corresponding to the multiple frequency bands in the multi-band combiner, The second end of the multi-band combiner is connected to the first target connection end on the first side of the antenna switch through the coupler, and the first target connection end is the connection end corresponding to the transceiver antenna unit in the antenna module. Therefore, by arranging the combiner and the coupler, the common input or output of multiple signals is realized, the number of components is reduced, the structural complexity in the radio frequency transceiver channel is reduced, and the cost of the radio frequency front-end module is reduced.

FIG. 3 is a schematic structural diagram of a transceiver processing circuit according to an embodiment of the present application. As shown in FIG. 3 , the transceiver processing circuit of the first frequency band among the multiple frequency bands includes: a power amplifier, a low noise amplifier, and a switch.

The input end of the power amplifier 114 is used to connect to the transmitting interface of the first frequency band in the radio frequency transceiver 200 , the output end of the power amplifier 114 is connected to the first end of the switch 116 , and the output end of the low noise amplifier 115 is used to connect to the radio frequency transceiver 200 For the receiving interface of the first frequency band, the input end of the low noise amplifier 115 is connected to the second end of the switch 116 , and the third end of the switch 116 is connected to the connection end corresponding to the first frequency band on the multi-band combiner 112 .

The switch 116 is a SPDT switch, and the multi-band combiner 112 is connected to the power amplifier 114 or the low noise amplifier 115 by controlling the SPDT switch. The power amplifier 114 is used to amplify the radio frequency signal transmitted by the transmitting interface of the first frequency band of the radio frequency transceiver 200, and transmit the amplified radio frequency signal to the switch 116 corresponding to the first frequency band on the switch multi-band combiner 112. The connection end constitutes a radio frequency transmitting circuit. The low-noise amplifier 115 is used to improve the signal-to-noise ratio of the output signal, receives the radio frequency signal transmitted by the connection terminal corresponding to the first frequency band on the multi-band combiner 112 through the switch 116, and performs low-noise amplification on the radio frequency signal to improve the signal-to-noise ratio, and transmit the low-noise amplified radio frequency signal to the receiving interface of the first frequency band in the radio frequency transceiver 200 to form a radio frequency receiving circuit. By arranging the power amplifier 114 and the low noise amplifier 115, the transmission and reception of the radio frequency signal are made more accurate, and the identification is facilitated.

For example, the first frequency band may be frequency bands such as n77 (3300-4200MHz), n78 (3300-3800MHz), and n79 (4400-5000MHz).

To sum up, in the embodiment of the present application, the transceiver processing circuit of the first frequency band in the multiple frequency bands includes: a power amplifier, a low noise amplifier, and a switch; the input end of the power amplifier is used to connect to the transmission interface of the first frequency band in the radio frequency transceiver , the output end of the power amplifier is connected to the first end of the switch, the output end of the low noise amplifier is used to connect the receiving interface of the first frequency band in the radio frequency transceiver, the input end of the low noise amplifier is connected to the second end of the switch, the third end of the switch The terminal is connected to the connection terminal corresponding to the first frequency band on the multi-band combiner. Therefore, by setting the power amplifier and the low noise amplifier, the transmission and reception of the radio frequency signal are more accurate and easy to identify.

Continuing to refer to FIG. 3 , the multi-band combiner 112 is integrated with a band-pass filter corresponding to the first frequency band. For example, when the first frequency band includes n77 (3300-4200MHz) and n78 (3300-3800MHz), the filters corresponding to the n77 (3300-4200MHz) and n78 (3300-3800MHz) frequency bands are bandpass filters; When the frequency band includes n79 (4400-5000MHz), the filter corresponding to the n79 (4400-5000MHz) frequency band can be either a band-pass filter or a high-pass filter. For example, filters such as SAW, TC_SAW, IHP SAW, BAW, LTCC, IPD, and combinations thereof.

FIG. 4 is a schematic structural diagram of another transceiver processing circuit according to an embodiment of the present application. As shown in FIG. 4 , the transceiver processing circuit of the second frequency band in the multiple frequency bands includes: a power amplifier, a low noise amplifier, multiple duplexers, multiple transmit filters, multiple receive filters, a single-band combiner, A first switch, a second switch, and a third switch.

The input end of the power amplifier 114 is used to connect to the transmit interface of the second frequency band in the radio frequency transceiver 200 , the output end of the power amplifier 114 is connected to one end of the first switch 122 , and the other ends of the first switch 122 pass through a plurality of transmit filters respectively. The switch 118 is connected to a connection terminal of the third switch 124 on the first side. The output end of the low noise amplifier 115 is used to connect to the receiving interface of the second frequency band in the radio frequency transceiver 200 , the input end of the low noise amplifier 115 is connected to one end of the second switch 123 , and the other ends of the second switch 123 pass through a plurality of The receive filter 119 is connected to the plurality of connection terminals of the third switch 124 on the first side. The two connecting ends of the third switch 124 on the second side are respectively connected to the two connecting ends on the first side of the single-band combiner 121 , and the connecting end of the single-band combiner 121 on the second side is connected to the multi-band combiner The connection terminal corresponding to the second frequency band on 112.

There are multiple sub-bands in the second frequency band, and different sub-bands correspond to different transmit filters 118 and receive filters 119 , so multiple transmit filters 118 and multiple receive filters 119 are required. A plurality of duplexers 117 are also connected between the first switch 122 and the third switch 124. The first switch 122 is a single-pole, multi-throw switch. Through the first switch 122, the power amplifier 114 and different transmit filters 118 or Duplexer 117 is connected. The second switch 123 is also connected to the third switch 124 through a plurality of duplexers 117 . The second switch 123 is a single-pole, multi-throw switch. Through the second switch 123 , the low-noise amplifier 115 and different receiving filters 119 or dual The worker 117 is connected. The single-band combiner 121 is connected to the transmit filter 118 or the receive filter 119 or the duplexer 117 through the third switch 124, so as to realize the function of transmitting and receiving radio frequency corresponding to the transceiver processing circuit 111 of the second frequency band. Amplification processing makes the transmitted and received RF signals more accurate.

For example, the second frequency band is a frequency band corresponding to 2G, 3G, and 4G. If the sub-frequency band is FDD (Frequency Division Duplexing), both the first switch 122 and the second switch 123 need to be connected to the duplexer 117. The duplexer The device 117 is composed of two filters, and the two filters work simultaneously; if the sub-band is TDD (Time Division Duplexing, Time Division Duplexing), the first switch 122 is connected to the transmit filter 118, and the second switch 123 is connected to the receive filter 119, The transmit filter 118 and the receive filter 119 work in time division and do not need to work at the same time.

To sum up, in the embodiment of the present application, the transceiver processing circuit of the second frequency band in the multiple frequency bands includes: a power amplifier, a low noise amplifier, multiple duplexers, multiple transmit filters, multiple receive filters, a single frequency band a combiner, a first switch, a second switch and a third switch; the input end of the power amplifier is used to connect to the transmitting interface of the second frequency band in the radio frequency transceiver, the output end of the power amplifier is connected to one end of the first switch, the first switch The other ends of the plurality of are respectively connected to one connection end of the third switch on the first side through a plurality of transmit filters; the output end of the low noise amplifier is used to connect the receiving interface of the second frequency band in the radio frequency transceiver, and the input end of the low noise amplifier The terminal is connected to one end of the second switch, and the other terminals of the second switch are respectively connected to the connection terminals of the third switch on the first side through a plurality of receiving filters; the two connection terminals of the third switch on the second side are respectively The two connection terminals on the first side of the single-band combiner are connected, and the connection terminal on the second side of the single-band combiner is connected to the connection terminal corresponding to the second frequency band on the multi-band combiner. Therefore, through filtering and amplifying processing, the transmitted and received radio frequency signals are more accurate.

Continuing to refer to FIG. 4 , the multi-band combiner is integrated with a low-pass filter corresponding to the second frequency band. For example, filters such as SAW, TC_SAW, IHP SAW, BAW, LTCC, IPD, and combinations thereof.

FIG. 5 is a schematic structural diagram of a radio frequency receiving channel according to an embodiment of the present application. As shown in FIG. 5 , the multiple groups of radio frequency channels include: multiple radio frequency receiving channels, wherein each radio frequency receiving channel includes: a receiving processing circuit 125 of multiple frequency bands and a multi-band combiner 112 .

The first end of the receiving and processing circuit 125 of each frequency band is used to connect to the receiving interface of the corresponding frequency band on the radio frequency transceiver, and the second end of the receiving and processing circuit 125 of the multiple frequency bands is connected to the first end of the multi-band combiner 112 corresponding to the multiple frequency bands. One end, the second end of the multi-band combiner 112 is connected to the second target connection end on the first side of the antenna switch 120 , and the second target connection end is the connection end corresponding to the receiving antenna unit in the antenna module 300 .

Each radio frequency receiving channel in the plurality of radio frequency transmitting and receiving channels can receive radio frequency signals. The multi-band combiner 112 separates the multi-band radio frequency signals transmitted by the receiving antenna unit, and then transmits them to the receiving processing circuits 125 corresponding to the multiple frequency bands. By setting up a combiner, the multi-band RF signals are separated to realize the common output of multi-band signals, which reduces the number of components, reduces the structural complexity of the RF transceiver channel, and reduces the cost of the RF front-end module.

To sum up, in the embodiments of the present application, the multiple groups of radio frequency channels include: multiple radio frequency receiving channels, wherein each radio frequency receiving channel includes: a receiving processing circuit and a multi-band combiner for multiple frequency bands; The first end of the processing circuit is used to connect the receiving interface of the corresponding frequency band on the radio frequency transceiver, and the second end of the receiving and processing circuit of multiple frequency bands is connected to the first end corresponding to the multiple frequency bands in the multi-band combiner, and the multi-band combiner The second end of the antenna switch is connected to the second target connection end on the first side of the antenna switch, and the second target connection end is the connection end corresponding to the receiving antenna unit in the antenna module. Therefore, by setting up a combiner, the multi-band radio frequency signals are separated to realize the common output of multi-band signals, which reduces the number of components, reduces the structural complexity in the radio frequency transceiver channel, and reduces the cost of the radio frequency front-end module.

FIG. 6 is a schematic structural diagram of a receiving processing circuit according to an embodiment of the present application. As shown in FIG. 6 , the receiving processing circuit of the first frequency band among the multiple frequency bands includes: a low noise amplifier 115 .

The output end of the low noise amplifier 115 is connected to the receiving interface of the first frequency band in the radio frequency transceiver 200 , and the input end of the low noise amplifier 115 is connected to the first end corresponding to the first frequency band in the multi-band combiner 112 .

The low-noise amplifier 115 is used to improve the signal-to-noise ratio of the output signal, receive the radio frequency signal transmitted by the connection terminal corresponding to the first frequency band on the multi-band combiner 112, perform low-noise amplification on the radio frequency signal to improve the signal-to-noise ratio, and reduce the low noise. The radio frequency signal amplified by the noise is transmitted to the receiving interface of the first frequency band in the radio frequency transceiver 200 to form a radio frequency receiving circuit. By setting the low noise amplifier 115, the reception of the radio frequency signal is made more accurate, and the identification is facilitated.

For example, the first frequency band may be frequency bands such as n77 (3300-4200MHz), n78 (3300-3800MHz), and n79 (4400-5000MHz).

To sum up, in this embodiment, the receiving processing circuit of the first frequency band in the multiple frequency bands includes: a low noise amplifier; the output end of the low noise amplifier is used to connect to the receiving interface of the first frequency band in the radio frequency transceiver, and the low noise amplifier The input end is connected to the first end corresponding to the first frequency band in the multi-band combiner. Therefore, by setting the low-noise amplifier, the reception of the radio frequency signal is made more accurate and easy to identify.

FIG. 7 is a schematic structural diagram of another receiving processing circuit provided by an embodiment of the present application. As shown in FIG. 7 , the receiving processing circuit of the second frequency band among the multiple frequency bands includes: a low noise amplifier, a plurality of receiving filters, a single frequency band combiner, a first switch and a second switch.

The output end of the low noise amplifier 115 is used to connect to the receiving interface of the second frequency band in the radio frequency transceiver 200 , the input end of the low noise amplifier 115 is connected to one end of the first switch 122 , and the other ends of the first switch 122 respectively pass through a plurality of other ends. The receive filter 119 is connected to the plurality of connection terminals of the second switch 123 on the first side.

The two connecting ends of the second switch 123 on the second side are respectively connected to the two connecting ends of the single-band combiner 121 on the first side, and the connecting ends of the single-band combiner 121 on the second side are connected to the multi-band combiner The connection terminal corresponding to the second frequency band on 112.

There are multiple sub-bands in the second frequency band, and different sub-bands correspond to different receiving filters 119 , so multiple receiving filters 119 are required. The first switch 122 is a single-pole multi-throw switch, and the low-noise amplifier 115 can be connected to different receiving filters 119 through the first switch 122 . The second switch 123 is a single-pole multi-throw switch, and the single-band combiner 121 can be connected to different receiving filters 119 through the second switch 123 . Through filtering and amplifying processing, the function of receiving radio frequency corresponding to the receiving processing circuit 125 of the second frequency band is realized, and the accuracy of receiving radio frequency signals is improved. For example, the second frequency band is a frequency band corresponding to 2G, 3G, and 4G.

To sum up, in this embodiment, the receiving processing circuit of the second frequency band in the multiple frequency bands includes: a low noise amplifier, a plurality of receiving filters, a single frequency band combiner, a first switch and a second switch; The output end is used to connect the receiving interface of the second frequency band in the radio frequency transceiver, the input end of the low noise amplifier is connected to one end of the first switch, and the other ends of the first switch are respectively connected to the second switch through a plurality of receiving filters. a plurality of connection terminals on one side; the two connection terminals of the second switch on the second side are respectively connected to the two connection terminals on the first side of the single-band combiner, and the connection terminals of the single-band combiner on the second side are connected The connection terminal corresponding to the second frequency band on the multi-band combiner. Therefore, through filtering and amplifying processing, the accuracy of receiving the radio frequency signal is improved.

On the basis of any of the embodiments described above in FIG. 1 to FIG. 7 , an embodiment of the present application further provides a radio frequency system. FIG. 8 is a schematic structural diagram of a radio frequency system. As shown in FIG. 8 , the radio frequency system includes: a radio frequency front-end module, a radio frequency transceiver and an antenna module.

The multiple radio frequency interfaces on the radio frequency transceiver 200 are respectively connected to the radio frequency processing circuits of multiple frequency bands in each group of radio frequency channels 110 in the radio frequency front-end module 100 , and the antenna switch 120 in the radio frequency front-end module 100 is connected to the multiple frequency bands in the antenna module 300 . antenna unit.

Through the multiple sets of radio frequency channels 110 and the antenna switches 120 in the radio frequency front-end module 100, the multiple sets of radio frequency channels in the radio frequency front-end module 100 are connected to multiple antenna units in the antenna module through the antenna switch 120 in turn, so as to expand The port switching function of the RF front-end module 100 is provided, so that the RF system has wider applicability.

In order to describe the solution of this application more clearly, the following uses a 2T4R (2 transmit channels, 4 receive channels) radio frequency front-end module as an example to explain the 2T4R radio frequency front-end module provided in this application. FIG. 9 is a schematic structural diagram of a 2T4R radio frequency front-end module provided by an embodiment of the present application. As shown in FIG. 9 , the 2T4R RF front-end module includes: two RF transceiver channels, two RF reception channels, and an antenna switch 120 .

The first frequency band includes frequency band B and frequency band C, and the second frequency band includes frequency band A. Correspondingly, each radio frequency transceiver channel includes: a transceiver processing circuit 111 of frequency band A, a transceiver processing circuit 111 of frequency band B, a transceiver processing circuit 111 of frequency band C, a multi-band combiner 112 and a coupler 113 . Each radio frequency receiving channel includes: a receiving and processing circuit 125 in frequency band A, a receiving and processing circuit 125 in frequency band B, a receiving and processing circuit 125 in frequency band C, and a multi-band combiner 112 . The multi-band combiner 112 integrates: a filter fA corresponding to the frequency band A, a filter fB corresponding to the frequency band B, and a filter fC corresponding to the frequency band C. The transceiver processing circuit 111 of the first frequency band includes: a power amplifier 114 , a low noise amplifier 115 and a switch 116 ; the reception processing circuit 125 of the first frequency band includes: a low noise amplifier 115 . The antenna switch 120 is a 4P4T (four-pole, four-throw) switch, and the antenna switch 120 is correspondingly connected to four antenna units (ANT1, ANT2, ANT3, ANT4). Through the switching of the 4P4T switch, the arbitrary switching connection between the four radio frequency channels 110 and the four antenna units can be realized.

The transmitting ends (Tx1_A, Tx2_A) of the transceiver processing circuit 111 of the frequency band A, the transmitting ends (Tx1_B, Tx2_B) of the transceiver processing circuit 111 of the frequency band B, and the transmitting ends (Tx1_C, Tx2_C) of the transceiver processing circuit 111 of the frequency band C are all connected to The transmitter interface of the corresponding frequency band on the radio frequency transceiver; the transceiver processing circuit 111 of the frequency band A, the receiving end (Rx1_A, Rx2_A, Rx3_A, Rx4_A) of the receiving processing circuit 125, the transceiver processing circuit 111 of the frequency band B, and the transmitting end of the receiving processing circuit 125 ( Tx1_B, Tx2_B, Rx3_B, Rx4_B), the transceiver processing circuit 111 of the frequency band C, and the transmitting end (Tx1_C, Tx2_C, Rx3_C, Rx4_C) of the receiving processing circuit 125 are all connected to the receiving interface of the corresponding frequency band on the radio frequency transceiver. For example, frequency band A may be a frequency band corresponding to 2G, 3G, and 4G, frequency band B may be n77 (3300-4200 MHz), and frequency band C may be n79 (4400-5000 MHz).

For radio frequency signals in frequency bands B and C, when transmitting radio frequency signals, power amplifier 114 can be used to amplify the radio frequency signals; when receiving radio frequency signals, low noise amplifier 115 can be used to improve the signal-to-noise ratio of the radio frequency signals. For the entire 2T4R RF front-end module provided in this application, only four combiners and two combiners are used. Compared with the existing 2T4R RF front-end module, the structure is simple and the cost is low. At the same time, the RF front-end is expanded. The port switching function of the module realizes the SRS (Sounding Reference Signal, sounding reference signal) signal antenna rotation function.

In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

Claims (10)

1. a radio frequency front-end module, is characterized in that, described radio frequency front-end module comprises: multiple groups of radio frequency channels, antenna switches, wherein, each group of radio frequency channels comprises: the radio frequency processing circuit of multiple frequency bands, the radio frequency of each frequency band The first end of the processing circuit is used to connect to the corresponding radio frequency interface on the radio frequency transceiver, and the second ends of the radio frequency processing circuits of the multiple frequency bands are all connected to the multiple connection ends of the first side of the antenna switch, and the antenna switch The plurality of connection ends on the second side of the middle are respectively used to connect a plurality of antenna units in the antenna module. 2 . The module according to claim 1 , wherein the multiple groups of radio frequency channels include: multiple radio frequency transceiver channels, wherein each radio frequency transceiver channel includes: transceiver processing circuits of the multiple frequency bands, multiple Band combiners and couplers; The first end of the transceiver processing circuit of each frequency band is used to connect the transmitting interface and the receiving interface of the corresponding frequency band on the radio frequency transceiver, and the second end of the transceiver processing circuit of the multiple frequency bands is connected to the multi-band combiner. The first ends corresponding to the multiple frequency bands, the second end of the multi-band combiner is connected to the first target connection end of the first side on the antenna switch through the coupler, and the first target The connection end is the connection end corresponding to the transceiver antenna unit in the antenna module. 3. The module according to claim 2, wherein the transceiver processing circuit of the first frequency band in the plurality of frequency bands comprises: a power amplifier, a low noise amplifier and a switch; The input end of the power amplifier is used to connect to the transmitting interface of the first frequency band in the radio frequency transceiver, the output end of the power amplifier is connected to the first end of the switch, and the output end of the low noise amplifier is used for is connected to the receiving interface of the first frequency band in the radio frequency transceiver, the input end of the low noise amplifier is connected to the second end of the switch, and the third end of the switch is connected to the multi-band combiner the connection terminal corresponding to the first frequency band. 4 . The module according to claim 3 , wherein a bandpass filter corresponding to the first frequency band is integrated in the multi-band combiner. 5 . 5. The module according to claim 2, wherein the transceiver processing circuit of the second frequency band in the plurality of frequency bands comprises: a power amplifier, a low noise amplifier, a plurality of duplexers, a plurality of transmit filters, a plurality of receive filters, a single-band combiner, a first switch, a second switch and a third switch; The input end of the power amplifier is used to connect to the transmitting interface of the second frequency band in the radio frequency transceiver, the output end of the power amplifier is connected to one end of the first switch, and multiple other ends of the first switch are connected. one end is respectively connected to one connection end of the third switch on the first side through the plurality of transmit filters; The output end of the low-noise amplifier is used to connect to the receiving interface of the second frequency band in the radio frequency transceiver, the input end of the low-noise amplifier is connected to one end of the second switch, and the multiple terminals of the second switch are connected. The other ends of the third switches are respectively connected to the plurality of connection ends of the third switch on the first side through the plurality of receiving filters; The two connecting ends of the third switch on the second side are respectively connected to the two connecting ends on the first side of the single-band combiner, and the connecting ends of the single-band combiner on the second side are connected to the A connection end corresponding to the second frequency band on the multi-band combiner. 6 . The module according to claim 5 , wherein a low-pass filter corresponding to the second frequency band is integrated in the multi-band combiner. 7 . 7. The module according to claim 1, wherein the multiple groups of radio frequency channels include: multiple radio frequency receiving channels, wherein each radio frequency receiving channel includes: receiving and processing circuits of multiple frequency bands, router; The first end of the receiving processing circuit of each frequency band is used to connect to the receiving interface of the corresponding frequency band on the radio frequency transceiver, and the second end of the receiving processing circuit of the multiple frequency bands is connected to all of the multi-band combiners. the first terminals corresponding to the multiple frequency bands, the second terminal of the multi-band combiner is connected to the second target connection terminal on the first side of the antenna switch, and the second target connection terminal is the antenna The connection terminal corresponding to the receiving antenna unit in the module. 8. The module according to claim 7, wherein the receiving and processing circuit of the first frequency band in the plurality of frequency bands comprises: a low noise amplifier; The output end of the low-noise amplifier is used to connect to the receiving interface of the first frequency band in the radio frequency transceiver, and the input end of the low-noise amplifier is connected to the multi-band combiner corresponding to the first frequency band. first end. 9 . The module according to claim 7 , wherein the receiving and processing circuit of the second frequency band in the plurality of frequency bands comprises: a low noise amplifier, a plurality of receiving filters, a single frequency band combiner, a first switch and a second switch; The output end of the low noise amplifier is used to connect to the receiving interface of the second frequency band in the radio frequency transceiver, the input end of the low noise amplifier is connected to one end of the first switch, and the multiple terminals of the first switch are connected. The other ends of the second switches are respectively connected to the plurality of connection ends of the second switch on the first side through the plurality of receiving filters; The two connecting ends of the second switch on the second side are respectively connected to the two connecting ends on the first side of the single-band combiner, and the connecting ends of the single-band combiner on the second side are connected to the A connection end corresponding to the second frequency band on the multi-band combiner. 10. A radio frequency system, comprising: a radio frequency front-end module, a radio frequency transceiver and an antenna module as described in any one of the preceding claims 1-9; The multiple radio frequency interfaces on the radio frequency transceiver are respectively connected to the radio frequency processing circuits of multiple frequency bands in each group of radio frequency channels in the radio frequency front-end module, and the antenna switches in the radio frequency front-end module are connected to the radio frequency processing circuits in the antenna module. multiple antenna units.

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