JPH0440015A - Temperature compensating device and preparing method for temperature compensating data - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a temperature compensation device for temperature compensating the phase of a temperature compensated device such as a receiving device whose phase changes depending on temperature, and the creation of temperature compensation data. It is about the method.

2. Description of the Related Art As the performance of electronic devices has increased in recent years, strict performance has been required in terms of temperature characteristics, and the above-mentioned receiving device is no exception. In conventional temperature compensation, compensation is performed using an analog circuit, and FIG. 5 shows an example in which a conventional temperature compensation device is used in a receiving device.

This temperature compensation device 107 is equipped with a variable phase shifter 105 on the output side of the receiving device 104 for changing the amount of phase shift of the output signal of the receiving device 104, and is measured by a temperature sensor 101 provided around the receiving device 1040. Amplifying device 1 configured to be able to vary the DC offset value and phase of the temperature signal obtained by
02 and amplified by the amplifier 102, the variable phase shifter 105 is configured to adjust the amount of phase shift of the output signal of the receiver 104.

Note that 103 in the figure is an input terminal of the receiving device 104,
106 is an output terminal of the receiving device 104.

By the way, regarding the adjustment of the DC offset value and phase in the amplifying device 102, the receiving device 1040 phase is
For example, when the temperature changes almost linearly with respect to temperature as shown in the straight line 201 in FIG. I have to. Specifically, at all temperatures in the temperature range in which the receiving device 104 is used,
The ratio of the phase of the receiving device 104 to the phase of the entire temperature compensating device 107 is made to match a constant phase value.

Therefore, phase fluctuations of the receiving device 104 can be compensated for, and the phase between the input terminal 103 and the output terminal 106 can be made invariant with respect to temperature as shown by the straight line 203.

Problems to be Solved by the Invention However, in the conventional case, when setting the phase change with respect to the temperature of the entire temperature compensating device 107, the receiving device 10
4, the output voltage of the temperature sensor 101 relative to the temperature, and the conversion phase characteristics of the variable phase shifter 105 must be individually measured in advance, and based on the measured values, the straight line 202 is determined to have the same sign as the straight line 201. It is necessary to adjust the DC offset value and phase of the amplifier 102 so that the characteristics have opposite slopes, and the adjustment is time-consuming and inconvenient. Furthermore, there are also disadvantages in that the number of measurements and the number of adjustment points increases, which may increase costs.

In addition, in order to perform accurate compensation, the temperature sensor 10
1. Amplifying device 102, variable phase shifter 105, receiving device 10
4. Linearity is required for each characteristic, and each circuit becomes complicated in order to achieve this, and there is also the problem that errors from the linearity of each characteristic directly appear as errors in temperature compensation. Ta.

Note that such problems are not limited to the above-mentioned receiving device;
Similar problems occur in other electronic devices that require temperature compensation.

The present invention has been made in view of the above problems, and makes it possible to eliminate the need for adjusting DC offset values and phases, reduce the number of measurements, reduce the number of adjustment points, reduce costs, and achieve high precision even with nonlinear characteristics. The present invention provides a temperature compensation device capable of compensating the phase and a method of creating temperature compensation data.

Means for Solving the Problems In order to solve the above problems, the present invention provides a temperature compensation device for temperature compensating the phase of a temperature compensation device whose phase changes depending on temperature, in which the temperature compensation device is placed. a temperature sensor that measures the ambient temperature and outputs an analog value corresponding to the temperature; an A/D converter that converts the signal input from the temperature sensor into a digital signal and outputs it;
A memory device that outputs the corresponding temperature compensation data based on the signal input from the /D converter and an input/output terminal of the temperature compensation target device, and is installed between the input/output terminal of the temperature compensation target device and outputs the temperature compensation data based on the signal input from the memory device. It is characterized by comprising a variable phase shifter that temperature-compensates the phase of the device.

The memory device has temperature compensation data for all digital signals output from the A/D converter over the entire operating temperature range of the device to be temperature compensated in the storage section;
Temperature compensation data may be selected and output according to the input signal from the converter. Alternatively, data for temperature compensation may be stored in the storage unit for some representative signals of all digital signals output from the A/D converter over the entire operating temperature range of the device to be temperature compensated, and a data interpolation circuit may be used. This data interpolation circuit is
The temperature compensation data may be interpolated upon receiving the temperature signal from the D converter to obtain the temperature compensation data for the temperature signal.

Furthermore, regarding the creation of temperature compensation data, the temperature sensor, the A/D converter, the variable phase shifter, and the temperature compensation target device are each held at the same temperature and a signal of a specified phase is applied to the temperature compensation target device. , while reading the phase of the output signal from the output terminal of the device to be temperature compensated, give a temperature compensation control signal to the variable phase shifter so that the phase of the output signal becomes a predetermined phase; control signal and A/
Temperature compensation data is created by repeatedly determining the temperature output as a digital signal from the D converter while changing the temperature.

According to the above-described configuration, when the temperature signal measured by the temperature sensor is given to the memory device via the A/D converter, the memory device performs temperature compensation for the temperature measured by the temperature sensor. The variable phase shifter inputting this data temperature-compensates the phase of the temperature-compensated device.

In addition, when the memory device stores temperature compensation data for all digital signals output from the A/D converter over the entire operating temperature range of the device to be temperature compensated in its storage section, the A/D Temperature compensation data is selected and output based on the digital signal output from the converter. In addition, if the device is equipped with a data interpolation circuit, when the temperature signal measured by the temperature sensor is given to the data interpolation circuit via an A/D converter, the data interpolation circuit interpolates the temperature compensation data. Then, temperature compensation data regarding the temperature measured by the temperature sensor is obtained and outputted, and the variable phase shifter inputting this data temperature-compensates the phase of the temperature-compensated device.

Furthermore, in creating the temperature compensation data, the temperature sensor, A/D converter and variable phase shifter in the temperature compensation device, and the temperature compensation target device are each configured within the temperature range in which the temperature compensation target device is used. When the temperature is maintained, it is placed in the actual usage environment, and in that state, a signal with a specified phase is given to the temperature-compensated device, and the variable shift is performed while reading the phase of the output signal from the output terminal of the temperature-compensated device. Applying a temperature compensation control signal to the phase converter so that the phase of the output signal becomes a predetermined phase, and determining the temperature compensation control signal and the temperature output as a digital signal from the A/D converter at that time. Then, the measured value can be used as it is as temperature compensation data at that temperature, and if this is repeated at each temperature, temperature compensation data for the required temperature range can be created.

EXAMPLE Hereinafter, a temperature compensation device according to the present invention will be explained based on the drawings.

FIG. 1 is a block diagram showing a case where a temperature compensation device according to the present invention is applied to a receiving device 6. As shown in FIG. This temperature compensation device I8 is installed near the receiving device 6, which is a temperature compensation target device, and includes a temperature sensor l that measures the ambient temperature around the receiving device 6 and outputs an analog value corresponding to the temperature.
An A/D converter 2 that inputs the output of the temperature sensor l, converts it into a digital value, and outputs it; and a memory device 3 that obtains and outputs the corresponding temperature compensation data based on the output of the A/D converter 2. , a D/A converter 41 and a D/A converter 41 that input the output of the memory device 3, convert it into an analog value, and output it.
The variable phase shifter 4 includes a phase shifter 42 that can vary the amount of phase shift based on the output of the receiver 6 . In addition, 5.7 in the figure is an input terminal and an output terminal of the receiving device 6.

The temperature sensor 1 is composed of, for example, a thermistor temperature sensor, and outputs an analog value such as a voltage signal corresponding to the ambient temperature to the A/D converter 2.

The A/D converter 2 includes, for example, a successive approximation type A/D converter, converts the analog signal input from the temperature sensor 1 into a digital value, and outputs the digital value to the memory device 3. Note that the A/D converter 2 is not limited to the above-mentioned successive approximation type A/D converter, but may use one having another circuit configuration.

The memory device 3 includes a data storage section 32 that stores data corresponding to each address, and a data interpolation circuit 31.
The data storage unit 32 stores temperature compensation data for representative temperatures that are part of the total digital signal output from the A/D converter 2 over the entire range of environmental temperatures in which the receiving device 6 is used. Stored. This temperature compensation data includes, for example, an operating temperature of 140"C to +6
For 0°C, -40°C, -20°C, O''Cl2O
It is recommended to store about 6 points of 140°C and 160°C.

Then, the data interpolation circuit 31 performs interpolation processing (described later) based on the digital signal input from the A/D converter 2, obtains temperature compensation data for the corresponding temperature, and outputs it to the variable phase shifter 4. .

The D/A converter 41 is composed of, for example, a parallel D/A converter, and receives temperature compensation data (
When a digital signal (digital signal) is input, it is converted into an analog value such as a voltage signal and output to the phase shifter 42. In addition, D/
The A converter 41 is not limited to the above-mentioned parallel D/A converter, but may use one having another circuit configuration.

The phase shifter 42 is, for example, as shown in FIG.
It is configured to be controlled by. Note that C2 is the control voltage ■. It is the capacitor capacity that cuts. In this circuit configuration, the combined capacitance of C8 and C2 is CI - C1/
It is expressed as (C1+03) and the control voltage ■. By changing the amount of phase shift of the phase shifter 42, the amount of phase shift of the phase shifter 42 is adjusted. Therefore, the amount of phase shift of the output signal from the receiving device 6 can be adjusted. At this time,
The combined capacitance of C2 and 03 is C2・C,/(cz + C3
) = Cff÷(1+(Cs÷Ca)) It is best to use a larger value for Ct than the variable capacitance diode C3 so that the influence of C2 can be ignored. .

Note that as the phase shifter 42, one having another circuit configuration may be used.

By the way, the temperature compensation data is set as follows. As shown in FIG. 3, a control device 13 for creating temperature compensation data is provided in place of the memory device 3, and each device of the temperature compensation device 8 except for the control device 13 and the receiving device 6 are placed in a constant temperature bath. 21 and maintained at a constant temperature. The temperature is -40°C and -20°C as mentioned above.
- of C, O''C, 20''C, 40''C, 60°C
It's good to be quiet. Then, when the temperature reaches -a constant temperature, a signal with a specified phase is given to the receiving device 6 by the signal source 19, and the difference between the phase of the signal and the phase of the output signal from the output terminal 7 is read by the phase difference measuring device 20. , and inputs a signal regarding the difference to the control device 13.

Then, in order to eliminate the phase difference, the control device 13 changes the level of the temperature compensation control signal for determining the amount of phase shift of the phase shifter 42, supplies it to the variable phase shifter 4, and sends it to the variable phase shifter 4.
It is assumed that the ratio of the phase of the output signal from the signal source 19 to the phase of the output signal from the signal source 19, that is, the phase from the input terminal 5 to the output terminal 7, coincides with the straight line 203 in FIG. When this state is reached, the control device 13 uses the temperature compensation control signal as temperature compensation data, and
A temperature signal output from the temperature sensor 1 and converted into a digital quantity by the A/D converter 2 is stored as an address signal for the data.

The above operation was carried out at -40°C, -20°C, 10°Cl
The process is performed for all other temperatures of 20°C, 140°C, and 60°C, and temperature compensation data for each temperature is created. Then, this data is stored in the memory device 3 using, for example, a ROM writer, and then the control device 1
3 is replaced by a memory device 3, resulting in the circuit configuration shown in FIG. In this case, the temperature compensation control data to be set in the memory device can be created in one measurement, and the number of measurements can be significantly reduced compared to the conventional example.

Next, the content of temperature compensation by the temperature compensator 8 configured as described above will be explained. From input terminal 5 to receiving device 6
When a predetermined signal is input to the temperature sensor 1,
The ambient temperature in the vicinity of the receiving device 6 is measured, the measured signal is given to the A/D converter 2 to be converted into a digital value, and the signal is input to the data interpolation circuit 31 of the memory device 3.

When the data interpolation circuit 31 receives a signal from the A/D converter 2, the data interpolation circuit 31 selects, for example, from among typical temperature compensation data stored in the data storage section 32 of the memory device 3 based on the received signal. Two are read out and linear interpolation processing is performed.

Specifically, the temperature t measured by the temperature sensor 1 is stored in the memory device 32 and is a representative temperature T, ≦j < T z
Assuming that the temperature compensation data at each representative temperature T I and T z are KI and 2, respectively, the temperature compensation data k at the temperature t is determined by the following formula.

k=K1 + (t-TI)(K2-,)/(Tz
T1) The temperature compensation data obtained in this way is given to the D/A converter 41 of the variable phase shifter 4, where it is converted to an analog value, and the phase shifter 42 is converted to the analog value. The amount of phase shift is determined based on the temperature compensation data, and the receiving device 6
The phase of the output signal from is shifted by the amount of phase shift. Therefore, even if the receiving device 6 experiences phase fluctuations due to temperature changes, the temperature fluctuations in the phase between the input terminal 5 and the output terminal 7 of the receiving device 6 can be compensated for.

Thereafter, when the ambient temperature around the receiving device 6 changes, the temperature sensor 1 measures the temperature.

Thereby, the temperature compensation described above is performed in the same way.

This means that the temperature compensation control described above is repeated every time the temperature changes. As a result, even if the phase of the receiving device 6 changes due to temperature, the signal output from the receiving device 6 can be
It can be a state in which no phase change has occurred.

In addition, in the above embodiment, the operating temperature is 140°C to +60°C.
For C, -40°C, -20°C10°Cl2O°C
Temperature compensation data is stored for about 6 points of 140°C and 560°C, but if the operating temperature exceeds the above range, temperature compensation data is created in the corresponding temperature range. There is a need to. Also, 20
There is no need to create temperature compensation data every ℃, and the temperature pitch can be controlled accurately using a constant temperature bath.
For example, it is preferable to create temperature compensation data at a pitch of about 5° C. or less, since this allows more accurate control.

FIG. 4 is a block diagram showing another embodiment of the present invention.

In this embodiment, unlike the configuration shown in FIG. 1, the memory device 3 includes only a data storage section, and the data interpolation circuit 3
1 is not provided. This memory device 3 includes
The entire operating temperature range of the receiving device 6, for example -40°C to +
Temperature compensation data for all digital signals output from the A/D converter 2 is stored over the entire range of 60°C. This data can be created as follows.

The temperature signal input from the temperature sensor 1 to the control device 113 described above is used as the address t, and the representative temperatures described above are set as t+, tz...tゎ-++tn (n = positive integer), and the temperature at that time is Compensation data +, kg・
...kn-1, then, based on this measured value, a computer (not shown) calculates the address t and temperature compensation data k for each pitch of the digital signal output from the A/D converter 2 using the following formula. Calculated by

If t, <tit, then = ki + 1XA A = (kj, I - kj ) / (tj, l - t
j) However, j is a positive integer in the range of 1≦j≦n-1, and i is the rank of the address t for each pitchle between t and Lj+1.

In addition, in the case of t1 or less or t7 or more, the following procedure is performed.

If t1≧t: ni=ni, -i XB B= (kg k,)/(tz t+)t11
For ≦t: ni=ni, +1xC C= (kn-ni,,-+)/(t,-11-1
) The address and temperature compensation data thus obtained are stored in the memory device 3 using the above-mentioned ROM writer or the like.

When the memory device 3 receives the digital signal output from the A/D converter 2, it selects the corresponding temperature compensation data using the signal as an address and outputs it to the variable phase shifter 4. This performs temperature compensation.

Thereafter, when the temperature changes, the output value of the temperature sensor 1 changes accordingly, and the optimum phase of the variable phase shifter 4 is determined by the memory device Wt3. By repeating this,
Temperature fluctuations in the phase of the receiving device 6 are constantly compensated for.

Although linear interpolation using one point before and after is used for the above-mentioned interpolation processing, the interpolation processing is not limited to this, and nonlinear interpolation to compensate for nonlinear characteristics of temperature sensors, variable phase shifters, etc. May be used.

Further, in the embodiments shown in FIGS. 1 and 4, the variable phase shifter 4 is provided with a D/A converter 41, but the variable phase shifter 4 is configured to be operated by a digital signal. In this case, the D/A converter 41 may be omitted.

Further, in the above embodiment, temperature compensation is performed on the output side of the receiving device, but the present invention is not limited to this.
It can also be implemented by performing temperature compensation on the input side of the receiving device.

Furthermore, although the above-mentioned embodiment exemplifies a case in which temperature compensation is performed for a receiving device, the present invention is not limited to this, and can of course be similarly applied to other electronic devices that require temperature compensation. .

Effects of the Invention As described above, the present invention provides that when a temperature signal measured by a temperature sensor is directly given to a memory device via an A/D converter, the memory device receives the temperature signal measured by the temperature sensor. Temperature compensation data is then obtained, and the variable phase shifter that inputs this data temperature-compensates the phase of the temperature-compensated device, so even if the phase of the temperature sensor or variable phase shifter has nonlinear characteristics, the memory device Therefore, it is possible to easily provide nonlinearity between the two, and accurate temperature compensation can be performed. In addition, in creating temperature compensation data,
By using the method of the present invention, it is possible to use the measured values as they are, thereby eliminating the need for DC offset value and phase adjustment, which were required in the past. This has the effect of reducing the capacity of the memory device.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the temperature compensation device according to the present invention, Fig. 2 is a configuration diagram showing a phase shifter included in the device, and Fig. 3 is a temperature compensation set in the temperature compensation device. 4 is a block diagram showing another embodiment of the present invention, FIG. 5 is a block diagram of a conventional temperature compensation device, and FIG. 6 is a block diagram of a receiving device and a variable phase shifter. Temperature -
It is a phase characteristic diagram. 1... Temperature sensor, 2... A/D converter, 3...
Memory device, 31... Data interpolation device, 32... Data frame section, 4... Variable phase shifter, 41... D/A converter, 42... Phase shifter, 6...・Receiving device, 8...
Temperature compensation device, 13... Control device, 19... Signal source, 20... Phase difference measuring device, 201... Temperature phase characteristic of receiving device, 202... Temperature phase characteristic of temperature compensation device, 203...Characteristics of the receiving device after temperature compensation.

Claims (4)

[Claims] (1) In a temperature compensation device for temperature-compensating the phase of a temperature-compensated device whose phase changes depending on temperature, the temperature of the atmosphere in which the temperature-compensated device is placed is measured and an analog value corresponding to the temperature is output. A sensor, an A/D converter that converts the signal input from the temperature sensor into a digital signal and outputs it, a memory device that outputs corresponding temperature compensation data based on the signal input from the A/D converter, and a temperature sensor. 1. A temperature compensation device comprising: a variable phase shifter provided between input and output terminals of the device to be compensated, and temperature-compensating the phase of the device to be temperature compensated based on a signal input from a memory device. (2) The memory device has temperature compensation data for all digital signals output from the A/D converter over the entire operating temperature range of the device to be temperature compensated in the storage section,
2. The temperature compensation device according to claim 1, wherein temperature compensation data is selected and outputted according to an input signal from an A/D converter. (3) The memory device stores temperature compensation data regarding a representative signal that is a part of all digital signals output from the A/D converter over the entire operating temperature range of the device to be temperature compensated. In addition to storing data, the data interpolation circuit determines temperature compensation data regarding two representative temperatures within the range based on the temperature signal from the A/D converter. interpolate,
2. The temperature compensation device according to claim 1, wherein temperature compensation data is obtained for the temperature signal. (4) A temperature sensor that measures the ambient temperature in which the temperature compensation target device is placed and outputs an analog value corresponding to the temperature, and an A/D converter that converts the signal input from the temperature sensor into a digital signal and outputs it. , is provided between a memory device that outputs corresponding temperature compensation data based on the signal input from the A/D converter and the input/output terminal of the temperature compensation target device, and based on the signal input from the memory device, A method for creating temperature compensation data in a temperature compensation device comprising a variable phase shifter that temperature-compensates the phase of a device to be temperature compensated, the temperature sensor, the A/D converter, the variable phase shifter, and the temperature Each device to be compensated is held at the same temperature, a signal with a specified phase is given to each device to be compensated for, and a control signal for temperature compensation is sent to the variable phase shifter while reading the phase of the output signal from the output terminal of the device to be compensated for. by changing the temperature so that the phase of the output signal becomes a predetermined phase, and determining the temperature compensation control signal at that time in relation to the temperature output as a digital signal from the A/D converter. A method for creating temperature compensation data characterized by repeatedly performing