JPH069362B2 - Low power consumption method for signal transmitter / receiver - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a low power consumption method in a signal transmitting / receiving apparatus, and more particularly to a low power consumption method suitable for reducing power consumption in a ping-pong transmission type signal transmitting / receiving apparatus. It is a thing.

Prior art and problems The ping-pong transmission method is generally used in data transmission devices and the like, and when station A and station B which are opposite to each other exchange information with each other, station A is transmitting during transmission. B station only receives and does not transmit until B ends.
During the transmission of the station, station A performs only reception, and communication is performed by alternately performing transmission and reception.

As described above, in the ping-pong transmission type signal transmitting / receiving apparatus, the transmitting circuit and the receiving circuit are alternately operating in time, and the circuit on the non-operating side is in the dormant state during that time. A method in which power is supplied in the same manner as during operation is generally used. Therefore, wasteful power was consumed, but there has been no proposal to improve this in the past.

An object of the present invention is to solve the problems of the prior art as described above, and an object of the present invention is to provide a signal transmission / reception device that performs ping-pong transmission by alternately switching transmission and reception in time. It is an object of the present invention to provide a method capable of preventing wasteful power consumption and reducing power consumption by alternately supplying power to the transmission circuit and the reception circuit according to respective operations and pauses.

Configuration of the invention A method for reducing power consumption of a signal transmitting / receiving apparatus of the present invention is a signal transmitting / receiving apparatus that includes a transmitting circuit and a receiving circuit, and performs ping-pong transmission by alternately switching between transmission and reception in time, A switching signal that alternately gives two signal levels (0 or 1) corresponding to the operation section of the transmitting circuit and the receiving circuit, and a first reference current (I ₁ ) according to the signal level of one of the switching signals. A first element (R ₆ ) for flowing a current, a second element (R ₅ ) for flowing a _second reference current (I ₂ ) according to the other signal level of the switching signal, and the first reference current A constant current source for reception (aI ₂ , bI ₁ , cI ₁ ) for supplying power to the receiving circuit according to (I ₁ ) and power for the transmitting circuit according to the _second reference current (I ₂ ). transmitting a constant current source for (dI ₂₎ and provided with a switch to alternately said switching signal temporally It is, it is characterized in that automatically switch the power supply to the transmitting circuit and the receiving circuit.

Embodiment of the Invention FIG. 1 shows the configuration of an embodiment of the low power consumption system of the present invention. This figure illustrates a transmission / reception circuit in the ping-pong transmission system. Q _{1 to} Q ₁₀ are transistors, D _{1 to} D ₆ are diodes, ZD is a constant voltage diode, R _{1 to} R ₈ are resistors, C is a capacitor, and T is a transformer. , E is a power source for level shift, aI ₁ ,
bI ₁ , cI ₁ , and dI ₂ are constant current sources, 1 is a transmission input terminal, 2 is a reception output terminal, and 3 is a switching signal terminal.

At the time of transmission, the transmission input is applied from the terminal 1 to the base of the transistor Q ₁ , amplified, further amplified by the transistor Q ₂ , passed through the transformer T, and sent to the lines L ₁ and L ₂ . At this time, the constant current source dI ₂ supplies the collector current of the transistor Q ₁ and the power supply of the base bias circuit of the transistor Q ₂ . The circuit consisting of the diodes D ₁ and D ₂ and the resistors R ₁ and R ₂ clamps the base potential of the transistor Q ₂ to a constant value to prevent the transistor Q ₂ from saturating and slowing the operating speed. . Although not shown in FIG. 1, another set of similar transmission circuits is provided, and its output is coupled to the opposite polarities through the transformer T, so that the lines L ₁ and L ₂ are connected to the bipolar filters. It can send signals.

At the time of reception, the reception signal composed of the bipolar signals from the lines L ₁ and L ₂ passes through the transformer T and is transferred to the transistor.
Added to the base of Q _3, Q _4, generates an output emitter connected in common is full-wave rectified. This output is applied to the base of the transistor Q ₅ through the diode D _3, D _4, whereby it produces an output to the load resistor R _3, R ₄ connected to the emitter of the transistor Q _5, parallel with the resistor R ₄ Since the capacitor C is connected to and the time constant is selected to be sufficiently larger than the bit rate of the input signal, the input signal is smoothed and an output of about half the input peak value is generated across the resistor R _4. . This output is applied to the base of transistor Q ₈ . On the other hand, the outputs of the emitters of the transistors Q ₃ and Q ₄ are applied to the base of the transistor Q ₇ via the diode D ₃ . Transistors Q ₇ and Q ₈ share a constant current source cI ₁
The output of the emitters of the transistors Q ₃ and Q ₄ are identified by the level held in the capacitor C and are shaped into the collector of the transistor Q ₈ as they are connected to the RZ. Generate an output consisting of a signal. By inputting this signal to the common base, the transistors Q ₉ and Q ₁₀ are connected to the common emitter terminal 2 via the TTL.
Generate a level output signal.

Thus, in the transmitting / receiving circuit of FIG. 1, different circuit portions alternately operate during transmission and during reception. At the time of reception, the switching signal at the terminal 3 becomes high level, which turns on the transistor Q ₆ and the constant voltage diode Z.
The reference current I ₁ flows through the resistor R ₆ through D and the diode D ₆ .
As a result, the constant current sources aI ₁ , bI ₁ , cI ₁ are in the operating state,
The current value of the transistors Q ₃ and Q ₄ is determined from the difference between the constant current sources aI ₁ and bI ₁ , and the current is supplied and the constant current source cI ₁
The currents of the transistors Q ₇ and Q ₈ are supplied from the transistor, and the receiving circuit is activated.

On the other hand, at the time of transmission, the switching signal at the terminal 3 becomes low level, and the reference current I ₂ flows through the resistor R ₅ . As a result, the constant current source dI ₂ operates, the collector current of the transistor Q ₁ and the power of the base bias circuit of the transistor Q ₂ are supplied, and the transmission circuit is activated.

As described above, in the transmission / reception circuit of FIG. 1, the switching signal of the terminal 3 changes to the high level and the low level at the time of reception and at the time of transmission respectively, so that the constant current sources aI ₁ , bI ₁ , cI are respectively generated.
₁ or the constant current source dI ₂ operates to operate either the transmission circuit or the reception circuit, so that transmission / reception is switched, and power is not supplied to the circuit on the unused side.

2 and 3 show an example of the configuration of the constant current source in the transceiver circuit of FIG. FIG. 2 shows the configuration of a constant current source connected to the negative power source side, and includes R _{10 to} R ₁₄
Is a resistor, Q _{11 to} Q ₁₃ are transistors, D ₁₁ is a diode, R
_L1 to R _L3 is the load resistance. In FIG. 2, the resistor R ₁₁ and the diode D ₁₁ are respectively the resistor R ₆ and the diode R _{11 in} FIG.
It corresponds to the diode D ₆ and its current I _R corresponds to the current I ₁ . Further, R ₁₀ represents a portion of the circuit for flowing the current I ₁ in FIG. ₁ excluding the resistor R ₆ and the diode D ₆ . Now, the forward voltage V _D of diode D ₁₁ and transistor Q
_The relationship of V _BE = V _D (1) is maintained between the base emitter voltage V _{BE of 11 and} the base current i of the transistor Q _11.
B is assumed to be negligible compared to the current I _R. The base voltage v ₁ of the transistor Q ₁₁ is arbitrarily set by the values of the resistors R ₁₀ and R ₁₁ , and if the voltage v ₁ is constant, then the transistor Q 11
The emitter voltage v _{2 of 11} is stable at a value lower than the base voltage v ₁ by the base emitter voltage V _BE . This value is determined by the difference between the voltage v ₂ and the power supply voltage −5V, the resistance R ₁₂ and the load current I _L1 , and the following equation holds.

v ₁ ＝ R ₁₁ × I _R ＋ V _D ＝ R ₁₂ × I _L1 ＋ V _BE (2) Therefore, from the relations of equations (1) and (2) Therefore, if the reference current I _R is determined, the constant current I _L1 can be determined by the ratio of the resistors R ₁₁ and R ₁₂ . Thus transistor Q ₁₁ ,
In order to make the circuit composed of the resistor R ₁₃ correspond to the constant current source aI ₁ in FIG. ₁ , the resistance ratio R ₁₁ / R ₁₂ may be made equal to the current ratio a. Of entirely same for the constant current source cI _1, in a transistor Q ₁₂ which is connected to the transistor Q ₁₁ and the base common resistor R ₁₃ Metropolitan resistance ratio The constant current source cI ₁ can be configured by selecting

FIG. 3 shows the configuration of a constant current source connected to the positive power source side, where A is a current mirror circuit and R _L is a load. Constant current source bI connected to the negative power supply in FIG.
₁ can be configured by the circuit of FIG. In Fig. 2, the circuit consisting of resistor R ₁₃ , transistor Q ₁₃ and resistor R ₁₄ is The constant current source bI ₁ is formed as described above by selecting. The current mirror circuit A has a constant current bI on the base side.
_{When 1} is applied, the constant current bI ₁ of the same value is applied to the load _RL in the emitter circuit, so that the constant current source bI ₁ connected to the positive power supply in FIG. ₁ can be formed. In the same way, the constant current source dI ₂ connected to the positive power supply in FIG.
By applying the I _2, by the choice of the resistance ratio to form a constant current source dI _2, by applying this to the current mirror circuit of FIG. 3, it can be constructed.

As described above, according to the low power consumption system of the signal transmitting / receiving apparatus of the present invention, a ping-pong transmission is provided by temporally alternately switching between transmission and reception with a transmission circuit and a reception circuit. A signal transmitting / receiving apparatus for performing, in accordance with an operating period of the transmitting circuit and the receiving circuit, a switching signal that alternately gives two signal levels (0 or 1), and a first signal according to one signal level of the switching signal. A first element (R ₆ ) for flowing the reference current (I ₁ ) of No. 2 and a second element (R ₅ ) for flowing the second reference current (I ₂ ) according to the other signal level of the switching signal. , the receiving constant-current source for supplying power to the receiving circuit in accordance with the first reference current (I ₁₎ and (aI _2, bI _1, cI _1), according to the second reference current (I ₂₎ transmitting a constant current source for supplying power to the transmission circuit Te (dI ₂₎ and wherein the switching signal It is characterized by automatically switching the power supply to the transmitting circuit and the receiving circuit by alternately switching in time, thus preventing power from being unnecessarily supplied to the non-operation circuit, It is possible to reduce the power consumption of the signal transmission / reception device.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a low power consumption system of a signal transmitting / receiving apparatus of the present invention, FIG. 2 is a diagram showing a configuration example of a constant current source connected to a negative power source side, and FIG. FIG. 3 is a diagram showing a configuration example of a constant current source connected to the positive power source side. Q ₁ ~Q ₁₄ ...... _{transistor, D 1 ~D 6, D 11} ...... diodes, ZD ...... constant voltage _{diode, R 1 ~R 8, R 10} ~R 14 ...... resistance, R _L, R _L1 ~R _L3: load resistance, C: capacitor, T
...... Transformer, E …… Level shift power supply, aI ₁ , bI ₁ , cI
₁ , dI ₂ …… Constant current source, 1 …… Sending input terminal, 2 …… Reception output terminal, 3 …… Switching signal terminal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hajime Kamata 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (56) References JP-A-57-92955 (JP, A) JP-A-55-110453 (JP, A) Actually developed 54-181810 (JP, U)

Claims (1)

[Claims] 1. A signal transmission / reception apparatus comprising a transmission circuit and a reception circuit for alternately switching transmission and reception in time to perform ping-pong transmission, which corresponds to an operation section of the transmission circuit and the reception circuit. A switching signal for alternately providing two signal levels (0 or 1), and a first element (R ₆ ) for flowing a _first reference current (I ₁ ) according to one signal level of the switching signal, A second element (R ₅ ) for flowing a _second reference current (I ₂ ) according to the other signal level of the switching signal, and a power supply for the receiving circuit according to the _first reference current (I ₁ ). The receiving constant current source (aI ₂ , bI ₁ , cI ₁ ) for supplying and the transmitting constant current source (dI ₂ ) for supplying power to the transmitting circuit according to the _second reference current (I ₂ ) are provided. The transmission circuit and the reception circuit are automatically provided by alternately switching the switching signal in time. Low power consumption mode of the signal transmitting and receiving apparatus and switches the power supplied to.