JPH04172005A - Temperature compensating device - Google Patents

Abstract

PURPOSE:To prevent an envelope fluctuation due to a chattering, and to efficiently compensate a temperature by removing the chattering generated in the process of A/D converting a temperature signal including a noise by a hysteresis adding equipment. CONSTITUTION:This device is equipped with a temperature sensor l which measures the atmosphere temperature of an objective equipment 7 whose temperature is to be compensated, and whose gain fluctuates according to the temperature, and outputs an analog signal corresponding to the temperature, an A/D converter 2 which converts the output signal into a digital signal, and a hysteresis adding equipment 3 which adds a hysteresis characteristic to the digital signal. And also, this device is equipped with a memory device 4 which outputs data for compensating the temperature based on the output signal of the hysteresis adding equipment 3, and a variable gain equipment 5 which is serially connected with the equipment 7, and which compensates the gain of the equipment 7 based on the output signal of the memory device 4. That is, the chattering is removed from the digital data including the chattering due to the noise by the hysteresis adding equipment 3. Thus, a temperature compensating device 9 in which the envelope fluctuation due to the chattering due to the noise is not generated, can be obtained.

Description

Detailed Description of the Invention Industrial Application Fields of the Invention The present invention relates to molds whose gain changes with temperature. Technology As the performance of electronic devices has improved in recent years, strict performance is also required for the temperature characteristics of their gains, and the above receiver is no exception, but conventional temperature compensation is performed using analog circuits. Its performance was limited and its compensation accuracy was poor. Efforts to improve this problem By introducing temperature compensation using a digital circuit instead of temperature compensation using an analog circuit, non-linear characteristics could be achieved without adjustment. We have already proposed a temperature compensation device that can compensate the gain with high precision4.
Below, with reference to the drawings, we will explain an example in which a conventional temperature compensation device using an analog circuit is applied to a receiving device, and an example in which a temperature compensation device using a digital circuit, which has already been proposed, is applied to a receiving device. This is a block diagram of an application example of a temperature compensation device using a conventional analog circuit.
09 is equipped with a variable gain device 105 on the output side of the receiving device 107 to attenuate or amplify the output signal of the receiving device 107.
A temperature signal measured by a temperature sensor 101 provided around a receiving device 107 is applied to an amplifier 104 configured to be able to vary a DC offset value and a gain, and the signal amplified by this amplifier 104 is used to Variable gain device 105
10 in the figure.
6 is an input terminal of the receiving device 107, and 108 is an output terminal of the receiving device 107. By the way, the amplifier device 1
Regarding the adjustment of the DC offset value and gain in 04, the gain power statement of the receiver 107 For example, the straight line 2 in FIG.
01, when the gain changes almost linearly with respect to temperature, even if the change in gain with respect to temperature of the entire temperature compensator 109 becomes a straight line 202 having an opposite slope to the straight line 201, specifically 1. In all the temperature ranges in which the receiver 107 is used, the ratio of the gain of the receiver 107 to the gain of the entire temperature compensator 109 can be made to match a constant gain value, thereby reducing the gain fluctuations of the receiver 107. The gain between the input terminal 106 and the output terminal 108 can be made invariant with respect to temperature as shown by the straight line 203. When setting up the receiving device 1
It is necessary to individually measure the output voltage characteristics of the temperature sensor 101 and the conversion gain characteristics of the variable gain device 105 in advance. It is necessary to adjust the DC offset value and gain of the amplifier 104 so that the sign has a characteristic with an opposite slope, which has the problem of increasing the number of measurements, increasing the number of adjustment points, and thereby increasing the cost. In order to perform accurate compensation, linearity is required for each characteristic of the temperature sensor 101, amplifier 104, variable gain unit 105, and receiver 107, and in order to achieve this, each circuit becomes complicated.
In order to solve these problems, errors from the linearity of each characteristic directly appear as errors in temperature compensation. Although a temperature compensation device has already been proposed that can compensate for the gain with high precision even with nonlinear characteristics without adjustment by introducing temperature compensation, Fig. This temperature compensation device 309ζ is also shown in the block diagram.A temperature sensor 301 is installed near the receiving device 307, which is a device to be compensated for, and measures the ambient temperature around the receiving device 307 and outputs an analog value corresponding to the temperature. and an A/D converter 3 that inputs the output of the temperature sensor 301, converts it into a digital value, and outputs it.
02, a memory device 304 that outputs corresponding temperature compensation data based on the output of the A/D converter 302, and a D/A converter 351 that inputs the output of the memory device 304, converts it into an analog value, and outputs it. and a variable gain device 305 consisting of a variable attenuator 352 that can vary the amount of attenuation depending on the output of the D/A converter 351, and the variable attenuator 352 is provided on the output side of the receiving device 307. 3
06 and 3°8 are the input terminals of the receiving device 307, respectively.
The memory device 304 also includes a data storage section 342 that stores data corresponding to each address.
It has a data interpolation circuit 341 and its data storage section 34.
2 stores temperature compensation data for a representative temperature that is part of the total digital signal output from the A/D converter 302 over the entire range of environmental temperatures in which the receiving device 307 is used. Compensation data 1 6th
It satisfies the relationship of straight line 202 in the figure, for example, when the operating temperature is -40°C to +60°C -40'tA -2
Store about 6 points: 0t% Ot, 20't=40t, and 60°C. Then, the data interpolation circuit 34
14; t, performs interpolation processing, which will be described later, based on the digital signal input from the A/D converter 302, obtains temperature compensation data for the corresponding temperature, and outputs it to the variable gain unit 305.
The operation of the temperature compensation device 309 configured in this manner will be explained below.When a predetermined signal is input from the input terminal 306 to the receiving device 307, the temperature sensor 301 detects the atmosphere near the receiving device 307. Measure the temperature, give the measurement signal to the A/D converter 302, convert it into a digital value,
The signal is inputted to the data interpolation circuit 341 of the memory device 304. When the signal is given from the data interpolation circuit 341 and the GLA/D converter 3゜2, it is stored in the data storage section 342 of the memory device 304 based on the given signal. For example, two of the representative temperature compensation data are read out and subjected to linear interpolation processing. Specifically &yo Temperature sensor 3
The temperature measured at 01 is stored in the force t data storage section 342, which is the representative temperature T.

Assuming that it is in the range of ≦t<Tt, and the temperature compensation data at each representative temperature T1 and T is 1 and Km, respectively, the temperature compensation data k at the temperature t can be calculated using the following formula. + +(t −T+) (+ to Kg −)
/(Tt - Tt) The temperature compensation data obtained in this way is given to the D/A converter 351 of the zeta variable gain unit 305, where it is converted to an analog value, and the variable attenuator 352 converts it to the analog value. Determine the amount of attenuation based on the temperature compensation data L
The output signal from the receiving device 307 is attenuated, so that the receiving device 307 experiences gain fluctuations due to temperature changes.
Variable attenuator 352 can compensate for temperature fluctuations in gain between
Although the series of temperature compensation operations up to the determination of the attenuation amount are repeatedly performed at a cycle sufficiently faster than the change in the ambient temperature, this causes the gain of the receiving device 307 to fluctuate depending on the temperature.
The signal output from the receiving device 307 can be made into a state in which no gain fluctuation has occurred.
Characteristic 40 of Figure 8(a)
1, the output of the temperature sensor 301 may contain noise superimposed on the normal signal. A/D converter 30 shown in FIG. 8(b)
2. Even though the vibration (hereinafter referred to as chattering) of the converted data due to the superimposed noise shown in FIG. The memory device 3 shown in FIG. 8(c)
Similar chattering occurs in the output of 04 as shown at 404 in the same figure.As mentioned above, the attenuation amount of the variable attenuator 352 is determined by the output of this memory device 304.
In addition, the output waveform of the output terminal 308 shown in FIG. 8(d) is
Envelope fluctuations due to the above-mentioned chattering occur and become a type of noise, degrading reception characteristics such as bit error rate.
Even if the same problem occurs in other electronic devices that require temperature compensation, the present invention and friends have been made in view of the above problems,
In addition to eliminating the need to adjust DC offset values and gain, and being able to compensate for gain with high precision even with nonlinear characteristics,
An object of the present invention is to provide a temperature compensating device in which no envelope fluctuations due to chattering occur as described above.Means for Solving the ProblemsTo solve the above problems, the present invention ζ provides a temperature compensated device whose gain varies with temperature. an A/D converter that converts the signal input from the temperature sensor into a digital signal and outputs it, and an input signal from the A/D converter. a hysteresis adding device that adds a hysteresis characteristic to the digital signal and outputting the resultant digital signal; a memory device that outputs corresponding temperature compensation data based on the signal input from the hysteresis adding device; and a memory device that is connected in series to the temperature compensation target device. a variable gain device that temperature-compensates the gain of the temperature-compensated device based on a signal input from the memory device; a. Temperature compensation data for all digital signals output from the hysteresis adding device may be stored in a storage section, and temperature compensation data corresponding to the input signal from the hysteresis adding device may be selected and output. % good! Temperature compensation data for a representative signal that is a part of all digital signals output from the hysteresis adding device over the entire operating temperature range of the temperature compensation target device is stored in the storage section. The configuration includes a data interpolation circuit, and this data interpolation circuit determines temperature compensation data regarding two representative temperatures within the range based on the temperature signal from the hysteresis adding device, and interpolates the temperature signal. Temperature compensation data may also be obtained (°C) Effect of the present invention With the above-described configuration, a temperature signal containing noise measured by a temperature sensor is converted into digital data containing chattering by an A/D converter. When the temperature signal is applied to the hysteresis adding device, this hysteresis adding device removes this chattering.The temperature signal from which chattering has been removed is input to the memory device, and based on this temperature signal, the memory device ζ outputs temperature compensation data. The variable gain device that inputs this data temperature-compensates the gain of the temperature-compensated device. When storing temperature compensation data for all digital signals to be used, the data for temperature compensation is selected and output based on the digital signal output from the hysteresis adding device. When the temperature signal measured by the temperature sensor is given to the data interpolation circuit via the A/D converter and the hysteresis adding device, the data interpolation circuit power (by interpolating the stored temperature compensation data, the temperature signal is The variable gain device inputting this data calculates and outputs temperature compensation data regarding the temperature measured by the temperature compensation device, and temperature compensates for the gain fluctuation of the temperature compensation target device. This will be explained based on FIG. A temperature sensor 1 that measures the ambient temperature around the receiving device 7 and outputs an analog value corresponding to the temperature, and an A/D converter 2 that inputs the output of the temperature sensor 1, converts it into a digital value, and outputs it. , a hysteresis adding device 3 that adds hysteresis characteristics to the digital signal input from the A/D converter 2 to remove chattering contained in the input signal, and a corresponding temperature based on the signal input from the hysteresis adding device 3. A memory device 4 that outputs compensation data, a D/A converter 51 that inputs the output of the memory device 4, converts it to an analog value, and outputs it, and a variable device that can vary the amount of attenuation depending on the output of the D/A converter 51. It is equipped with a variable gain device 5 consisting of an attenuator 52, and the variable attenuator 52 is
6 in the figure, which is provided on the output side of the receiving device 7.
8 are the input terminal and output terminal of the receiving device 7, respectively, and the temperature sensor 1? & For example, this A/D consists of a thermistor temperature sensor, etc., and outputs an analog value such as a voltage signal corresponding to the ambient temperature to the A/D converter 2.
The converter 2 is composed of, for example, a successive approximation type A/D converter, and converts the analog signal input from the temperature sensor 1 into a digital value and outputs this to the hysteresis adding device 3.The hysteresis adding device 3ζ and its input value Hi
(k), and its output value is Ho (k). For example, the following hysteresis operation is not performed\ A hysteresis characteristic with a dead band of -1 to +1 is added to the input value. (i A/D converter 2
represents the time series of converted data by sampling.

Ho (k) = Hi (k) −1: H
i (k)−Ho (k−1) ≧2Ha (
k)=Ho (k-1) : 1≧Hi (k)-Ho (k'-1) ≧
−IHo (k)=Hi (k)+1: −2≧Hi (k)−Ho (k−1) In other words, the current input value Hi(k) is the previous output value Ho(k−
If it is 2 or more larger than 1), the input value Hi (k)
The value obtained by subtracting 1 from the current output value Ho (k) is output. Also, the difference between the current input value and the previous output value <
, 1.0, -1 (L The previous output value is maintained and the output does not change (~ Also, the current input value Hi
If (k) is less than or equal to 12 compared to the previous output value Ho (k-1), the value obtained by adding 1 to the input value Hi (k) will be output as the current output value Ho (k). As shown in the input waveform 61 and output waveform 62 of the hysteresis adding device in Fig. 2, it is possible to remove the chattering superimposed on the input signal. Even if it can be done
It can also be realized by software.Memory device 4
ζ has a data storage section 42 that stores data corresponding to each address, and a data interpolation circuit 41. Even if the temperature compensation data for the representative temperature, which is a part of the total digital signal to be output, is stored, the gain variation with respect to the temperature of the receiving device 7 can be expressed as the characteristic curve 71 in FIG.
By temperature-compensating the gain, the gain between the input terminal 6 and the output terminal 8 can be made into a straight line 73 in the same figure, which is constant with respect to temperature. This temperature compensation data stored in the data storage section 42 is a characteristic curve 72 obtained by folding 71 symmetrically with respect to the straight line 73. Yes, for example, if the operating temperature is -40℃ to +60℃, -40℃
-20-〇-20＼ 40＼It is good to store 60 degrees at 60°C. Then, the data interpolation circuit 41 performs interpolation processing, which will be described later, based on the digital signal input from the hysteresis adding device 3. , obtains temperature compensation data for the relevant temperature and outputs it to the variable gain unit 5.
The D/A converter 5 consists of a parallel D/A converter, for example, and when the temperature compensation data output from the memory device 4 is input, it converts it into an analog value such as a voltage signal and converts it into a variable attenuator. Output sumo to 52 This variable attenuator 52 is, for example, l! It can be configured with a π-type attenuator using a well-known PIN diode, and the gain of the output signal from the receiver 7 can be adjusted by using the output signal from the D/A converter 51 as a control signal. The content of temperature compensation by the configured temperature compensator 9 will be explained below.The temperature sensor 1 measures the ambient temperature near the receiver 7 and converts the measurement signal into an A/D converter.
The input to the hysteresis adding device 3 includes chattering due to noise as shown in the input waveform 61 in FIG. (Here, by performing the above-mentioned hysteresis calculation, this chattering can be removed as shown in the output waveform 62 in the same figure.)
The signal CL from which chattering has been removed by the hysteresis adding device 3 is input to the data interpolation circuit 41 of the memory device 4. For example, two of the typical temperature compensation data stored in the data storage unit 42 are read out and linear interpolation processing is performed. Specifically, the temperature t measured by the temperature sensor l (stored in the data storage unit 42) is assumed to be in the range of representative temperature T1≦t<Tt, and the temperature compensation data at each representative temperature T+, T* is 1 and Kg for each, calculate the temperature compensation data k at temperature t using the following formula.
/(Ts - T+) The temperature compensation data obtained in this way is given to the D/A converter 51 of the variable gain unit 5, where it is converted to an analog value, and the variable attenuator 52 is converted to the analog value. The attenuation amount is determined based on the temperature compensation data obtained.The output signal from the receiving device 7 is attenuated by the attenuation amount.
If the receiving device 7 causes gain fluctuations due to temperature changes, it may be possible to compensate for the temperature fluctuations in the gain when the input terminal 6 and output terminal 8 of the receiving device 7 are open.However, if the ambient temperature around the receiving device 7 changes, , the temperature sensor l measures the temperature, and the above-mentioned temperature compensation is also performed.
This temperature compensation is repeated each time the temperature changes.
As a result, the gain of the receiving device 7 changes depending on the temperature, so that the signal output from the receiving device 7 can be in a state where no change in gain occurs. It is not limited to , you can use other ones as well.
~ Also, the A/D converter k, the successive approximation type A/D
It is not limited to converters; you can also use other things (
~ Also, the D/A converter is not limited to the parallel type D/A converter, and those with other circuit configurations may be used.1. % In addition, the variable attenuator k is limited to the π-type attenuator using the PIN diode. Other circuit configurations capable of attenuation or amplification may also be used (~ Also, in the above embodiment, the operating temperature 140
For temperatures between ℃ and +60℃: -40--20℃ 0kan 2Qt,
List of 40 Forces that allow temperature compensation data to be stored for about 6 points at 60°C (not limited to this,
The temperature interval may be increased or decreased depending on the gain-temperature characteristics of the device subject to temperature compensation. Figure 4 is a block diagram showing another embodiment of the present invention. Unlike the configuration shown in FIG. 1, the memory device 4IJ<, only the data storage section is marked with a @ circle, and the memory device 4 is not equipped with the data interpolation circuit 41 described above.
The entire operating temperature range of the receiver 7 For example -
Even if temperature compensation data is stored for all digital signals output from the hysteresis adding device 3 over the entire range of 40°C to +60°C, this temperature compensation data
Such a memory device 4 may also be one in which the change in gain with respect to temperature of the variable gain device 5 is as shown in the characteristic curve 72 shown in FIG.
When the digital signal output from the hysteresis adding device 3 is input, the corresponding temperature compensation data is selected using the signal as an address and output to the variable gain unit 5, and the variable gain unit 5 performs temperature compensation accordingly. However, when the temperature changes, the output value of the temperature sensor 1 changes accordingly, and the memory device 4 determines the optimum gain of the variable gain unit 5. By repeating this, temperature fluctuations in the gain of the receiving device 7 are constantly compensated for. Part 1 @ The reason why the variable gain unit 5 is provided with the D/A converter 51 in the embodiment shown in FIG. 4 (when the variable gain unit 5 is configured to operate with a digital signal) j! The D/A converter 51 may be omitted (~ Also, the hysteresis characteristic of the hysteresis adding device 3 is designed to have a dead band of -1 to +1. However, the output of the temperature sensor I is not limited to this. If the noise superimposed on the receiver is large, it may be possible to widen the width of the dead zone described above.Also, in the embodiment described above, the power to perform temperature compensation on the output side of the receiver (the present invention is not limited to this) However, the present invention is not limited to this, and the present invention is not limited to this, but the present invention is not limited to this. It goes without saying that it can be similarly applied to other electronic devices that require When applied to a hysteresis adding device, this hysteresis adding device removes chattering generated during the A/D conversion process of a temperature signal containing noise. Temperature signal from which chattering has been removed 1
This memory device stores data for temperature compensation regarding the temperature measured by the temperature sensor.The variable gain unit inputting this data temperature-compensates the gain of the device to be temperature-compensated, so temperature compensation is performed. Even if the output of the target device has non-linear characteristics in the gain of the temperature sensor, variable gain device, etc., it is easy to eliminate non-linearity between the two using the memory device. Furthermore, by simply measuring the temperature compensation data, there is no need to adjust the DC offset value and gain, which were required in the past.More Memory By adding a data interpolation circuit to the device, the capacity of the memory device can be reduced.

[Brief explanation of drawings]

Figure 1 shows a block diagram showing an embodiment of the temperature compensator according to the present invention. Figure 2 shows input/output waveform diagram of the hysteresis adding device. FIG. 5 shows a block diagram showing another embodiment of the present invention; and FIG. 6 shows a block diagram of a conventional temperature compensator.
Figure 7 shows the temperature gain characteristics of the receiver variable gain device. Figure 8 shows the block diagram of the already proposed temperature compensation device.
The waveform diagram of each part of the temperature compensator that has already been proposed is shown below.
・Temperature sensor, 2...A/D converter 3...Hysteresis addition equipment [4...Memory device ff, 41...
・Data interpolation circuit 42...Data storage a 5...
Variable gain unit 51...D/A converter 52...Variable attenuation switch 7...Receiving device t61...Input wave of hysteresis adding device 62...Output wave of hysteresis adding device 71. ...Temperature gain characteristics of receiving device 72
...Temperature gain characteristics of the temperature compensation device Name of special agent after temperature compensation of the 73 river receiving device Patent attorney Akira Okaji and two others Fig. 1 q tivs practice U Fig. 2 Examination Fig. 3! 1 114 Figure 5 Crane 6 ifi Figure 7 3Df 5li) 184&1

Claims (1)

[Scope of Claims] (1) A temperature sensor that measures the ambient temperature of a temperature-compensated device whose gain varies depending on temperature and outputs an analog signal corresponding to the temperature, and converts the signal input from the temperature sensor into a digital signal. an A/D converter that converts and outputs the signal; a hysteresis adding device that adds hysteresis characteristics to the digital signal input from the A/D converter and outputs the same; and appropriate temperature compensation based on the signal input from the hysteresis adding device. and a variable gain device that is connected in series to the temperature compensation target device and temperature compensates the gain of the temperature compensation target device based on the signal input from the memory device. temperature compensation device. (2) The memory device has temperature compensation data for all digital signals output from the hysteresis adding device over the entire operating temperature range of the device to be temperature compensated, and 2. The temperature compensation device according to claim 1, wherein the temperature compensation data is selected and outputted accordingly. (3) The memory device stores temperature compensation data for a representative signal that is a part of all digital signals output from the hysteresis adding device over the entire operating temperature range of the device to be temperature compensated. and a data interpolation circuit, which determines and interpolates temperature compensation data regarding two representative temperatures within the range based on the temperature signal from the hysteresis adding device, and interpolates the temperature compensation data for two representative temperatures within the range. Claim 1 characterized in that temperature compensation data for the signal is obtained.
Temperature compensation device as described in section.