JPH0440007A - Temperature compensator and method of preparing 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 gain of a temperature compensated device such as a receiving device whose gain 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 applied to a receiving device.

This temperature compensator 107 is equipped with a variable gain device 105 on the output side of the receiver 104 that attenuates or amplifies the output signal of the receiver 104. Amplifying bag f102 configured so that the DC offset value and gain of the signal can be varied.
The gain of the variable gain unit 105 is adjusted using the signal amplified by the amplifier 102. Note that in the figure, 103 is an input terminal of the receiving device 104, and 106 is an output terminal of the receiving device 104.

By the way, regarding the adjustment of the DC offset value and gain in the amplifier 102, the gain of the receiving bag W104 is as follows.
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 between the gain of the receiving device f104 and the gain of the entire temperature compensator 107 is made to match a constant gain value. Therefore, gain fluctuations of the receiving device 104 can be compensated for, and the gain 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 gain change with respect to the temperature of the entire temperature compensation device 107, the receiving device 10
It is necessary to individually measure the gain variation with respect to temperature of 4, the output voltage of temperature sensor 101 with respect to temperature, and the conversion gain characteristic of variable gain unit 105, and based on the measured values, the straight line 202 and the straight line 201 are determined to have the same sign. It is necessary to adjust the DC offset value and gain of the amplifier 102 so that the characteristics have the opposite slope, 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 gain unit 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 can eliminate the need for adjusting the DC offset value and gain, reduce the number of measurements, reduce the number of adjustment points, and reduce costs, and also achieves high precision even with nonlinear characteristics. The present invention provides a temperature compensation device capable of compensating the gain 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 gain of a temperature-compensated device whose gain changes depending on temperature, in which the temperature-compensated 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. The device is characterized by comprising a variable gain device that temperature-compensates the gain 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, in order to create temperature compensation data, the temperature sensor, A/D converter, variable gain unit, and temperature compensation target device in the temperature compensation device are maintained at the same temperature, and a specified power is applied to the temperature compensation target device. While reading the output power from the output terminal of the device to be temperature compensated, a temperature compensation control signal is given to the variable gain device so that the output power becomes a predetermined power, and the temperature compensation control signal at that time is ,
Temperature compensation data is created by repeatedly determining the temperature output as a digital signal from the A/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 gain device inputting this data will temperature-compensate the gain 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 a variable gain device inputting this data temperature-compensates the gain of the temperature-compensated device.

Furthermore, in creating the temperature compensation data, the temperature sensor, A/D converter and variable gain device in the temperature compensation device, and the temperature compensation target device are each set at a temperature within the temperature range in which the temperature compensation target device is used. When the device is held in the temperature-compensated state, it is placed in the actual usage environment, and in that state, the specified power is supplied to the temperature-compensated device, and while reading the output power from the output terminal of the temperature-compensated device, temperature compensation is applied to the variable gain device. When the temperature compensation control signal at that time and the temperature output as a digital signal from the A/D converter are determined, the measured value becomes as it is. This can be used 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 the temperature compensation device according to the present invention is applied to a receiving bag W6. This temperature compensation device FB is installed near a receiving device 6, which is a device to be compensated for, and includes a temperature sensor 1 that measures the ambient temperature around the receiving device 6 and outputs an analog value corresponding to the temperature.
An A/D converter 2 which inputs the output of the temperature sensor 1, converts it into a digital value, and outputs it; and a memory device 3 which 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 gain device 4 is provided with a variable attenuator 42 that can vary the amount of attenuation based on the output of the receiver bag W6. 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°C.
For 0°C, -40°C1-20°C10°Cl2O
It is recommended to store about 6 points of 140°C and 160°C.

Then, the data interpolation circuit 31 performs interpolation processing, which will be 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 gain unit 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 is input, it is converted into an analog value such as a voltage signal and output to the variable attenuator 42. In addition,
The D/A converter 41 is not limited to the above-mentioned parallel type D/A converter, but one having another circuit configuration may be used.

The variable attenuator 42 uses, for example, a PIN attenuator configured as shown in FIG. 2. This PIN
When the attenuator changes the control voltage, the PIN
The forward bias current IFI of Dl flowing through diode DI and resistor Rb changes, and as a result, the high-frequency resistance rtll of PIN diode D1 also changes, causing the potential 5 at point b to change. As a result, the forward bias current IF2 flowing through the PIN diode D2D3 to which a fixed voltage Vec is applied changes, and the forward bias current IF2 flowing through the PIN diode D2D3 to which a fixed voltage Vec is applied changes, causing the PMN diode Dz, the DiO high frequency resistor rd2. r
d3 is also configured to change, so that the amount of attenuation can be changed while keeping the input/output impedance constant. Therefore, by using the output signal from the D/A converter 41 as the control voltage Vs, the gain of the output signal from the receiving device 6 can be adjusted. Note that the variable attenuator 42 is not limited to the above-mentioned PIN attenuator that can be attenuated, but other circuit configurations that can be attenuated or amplified 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, -20"C as mentioned above.
It is preferable to set the temperature to one of 20°C, 140"C and 60"C. Then, when the temperature becomes constant, power is supplied to the receiving device 6 from the signal source 19 with the specified input power being obtained at the input terminal 5. and the output power from output terminal 7 is given as
The power is read by a power meter 20 that detects electric power, and the voltage signal is input to the control device 13.

Then, the control device 113 changes the level of the temperature compensation control signal for determining the amount of attenuation of the variable attenuator 42,
The ratio of the output power applied to the variable gain unit 4 from the power meter 20 and the input power at the signal source 19, that is, the gain from the input terminal 5 to the output terminal 7, matches the straight line 203 in FIG. When the state is reached, the control device 113 uses the temperature compensation control signal as temperature compensation data, and outputs the data as an address signal from the temperature sensor 1 and converts it into a digital quantity by the A/D converter 2. Save the temperature signal.

The above operation was carried out at -40°C, -20°C and 10°C.
This is performed for all other temperatures among 120°C, 140"C, and 160°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 memory device 3 is installed in place of the control device 130, and the circuit configuration is as shown in FIG. This makes it possible to significantly reduce the number of measurements compared to the conventional example.

Next, the content of temperature compensation by the temperature compensator 8 configured in this way will be explained. When a predetermined signal is input from the input terminal 5 to the receiving device 6, the temperature sensor 1
measures the ambient temperature near the receiver W6, supplies the measured signal to the A/D converter 2 to convert it into a digital value, and inputs the signal 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, it is assumed that the temperature t measured by the temperature sensor 1 is stored in the memory device 32 and is in the range of representative temperature T, ≦t<Tz, and the temperature compensation at each representative temperature T I and T 2 is performed. Assuming that the data for compensation are 1 and K2, respectively, the temperature compensation data k at the temperature t is obtained using the following formula.

k=to+ + (t T+ ) (Kz K+
)/('rz -T+) The temperature compensation data obtained in this way is given to the D/A converter 41 of the variable gain unit 4, where it is converted to an analog value, and the variable attenuator 42 converts it into an analog value. The amount of attenuation is determined based on the temperature compensation data converted into an analog value, and the output signal from the receiving device 6 is attenuated by the amount of attenuation. Therefore, even if the receiving device 6 experiences gain fluctuations due to temperature changes,
Temperature fluctuations in gain between the input terminal 5 and 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 similarly performed.

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

In addition, in the above embodiment, the operating temperature ranges from 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 60°C, but if the operating temperature exceeds the above range, temperature compensation data is stored in the corresponding temperature range. need to be created. Also, 20°
It is not necessary to create temperature compensation data for every 5°C, but it is more efficient to create temperature compensation data at a temperature pinch where the temperature can be accurately controlled in a constant temperature bath, for example, at 5°C pitch or less. This is preferable because it can be controlled with precision.

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 13 described above is used as the address t, and the representative temperature described above is set as 1. ．． 12...L,,-1,t,.

(n: a positive integer) and the temperature compensation data at that time is , , , −, l , and based on these measured values, a computer (not shown) outputs the output from the A/D converter 2. The address t and temperature compensation data k are calculated by the following formula for each pitch of the digital signal.

If t, <titI, then = kJ + 1XA A = Hcj + i - ) / (tj, + - tJ
) However, j is a positive integer in the range of 1≦j≦n-1, i
is t, ~tJ. Address t for each pitch P between 1
This is the ranking.

In addition, below tl or 1. , In the above case, proceed as follows.

When t1≧t: k = k 1r
, for ≦t: ni = ni, l+1XC C= (k, -, , -+ )/ (tn -tn-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 gain unit 4. Temperature compensation is performed by

Thereafter, when the temperature changes, the output value of the temperature sensor 1 changes accordingly, and the optimum gain of the variable gain unit 4 is determined by the memory device 3. By repeating this, temperature fluctuations in the gain of the receiving device 6 are constantly compensated for.

Although linear interpolation using one point each before and after is used for the interpolation processing described above, the interpolation processing is not limited to this, and nonlinear interpolation is used to compensate for nonlinear characteristics of temperature sensors, variable gain devices, etc. It's okay.

Further, in the embodiments shown in FIGS. 1 and 4, the variable gain unit 4 is provided with a D/A converter 41, but if the variable gain unit 4 is configured to operate with a digital signal, , 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. The variable gain device that inputs this data temperature-compensates the gain of the temperature-compensated device, so even if the gains of the temperature sensor and variable gain device have nonlinear characteristics, the memory device can compensate for both. 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 measured values as they are, thereby eliminating the need to adjust the DC offset value and gain, which were required in the past, and furthermore, it is possible to use a configuration in which a data interpolation circuit is added to the memory device. 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 variable attenuator provided in the device, and Fig. 3 is a temperature compensation set in the temperature compensation device. FIG. 4 is a block diagram showing another embodiment of the present invention, FIG. 5 is a block diagram of a conventional temperature compensator, and FIG. FIG. 3 is a gain characteristic diagram. 1... Temperature sensor, 2... A/D converter, 3...
Memory device, 31... Data interpolation device, 32... Data frame section, 4... Variable gain unit, 41... D/A converter, 42... Variable attenuator, 6... Receiving device, 8.
...Temperature compensation device, 13...Control device, 19...Signal source, 20...Power meter, 201...Temperature gain characteristic of receiving device, 202...Temperature gain 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 gain of a temperature-compensated device whose gain changes depending on temperature, the temperature of the ambient temperature 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 gain device provided between input and output terminals of the device to be compensated, and temperature-compensating the gain 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 gain device that temperature-compensates the gain of a temperature compensation device, the temperature sensor, the A/D converter, the variable gain device, and the temperature compensation device. Each device is maintained at the same temperature, a specified power is supplied to the device to be temperature compensated, and a control signal for temperature compensation is given to the variable gain device while reading the output power from the output terminal of the device to be temperature compensated, so that the output power is The method is characterized in that the temperature compensation control signal at that time and the temperature output as a digital signal from the A/D converter are repeatedly determined by changing the temperature so that the power becomes a predetermined value. How to create temperature compensation data