CN115051648A - Crystal oscillator automatic temperature compensation voltage acquisition device and method - Google Patents
Crystal oscillator automatic temperature compensation voltage acquisition device and method Download PDFInfo
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- CN115051648A CN115051648A CN202210782254.8A CN202210782254A CN115051648A CN 115051648 A CN115051648 A CN 115051648A CN 202210782254 A CN202210782254 A CN 202210782254A CN 115051648 A CN115051648 A CN 115051648A
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Abstract
The invention provides a device and a method for acquiring automatic temperature compensation voltage of a crystal oscillator, wherein the acquisition device comprises a high-low temperature test box, a voltage-controlled crystal oscillator, an external high-stability reference crystal oscillator, a first frequency dividing circuit, a second frequency dividing circuit and a phase comparison circuit, wherein the voltage-controlled crystal oscillator is placed in the high-low temperature test box and used for outputting a frequency signal to be compensated, and the external high-stability reference crystal oscillator is used for outputting a reference frequency signal; the first frequency division circuit is used for dividing the frequency of the frequency signal to be compensated so as to output a first frequency division signal; the second frequency dividing circuit is used for dividing the frequency of the reference frequency signal to output a second frequency divided signal; the phase comparison circuit is used for comparing the first frequency-divided signal with the second frequency-divided signal to obtain the phase deviation of the first frequency-divided signal and the second frequency-divided signal, and finally converting the phase deviation into a compensation voltage signal with a corresponding size and outputting the compensation voltage signal. The invention can effectively improve the acquisition efficiency and accuracy of the temperature compensation voltage of the crystal oscillator so as to overcome the technical problems in the prior art.
Description
Technical Field
The invention relates to the technical field of crystal oscillators, in particular to a device and a method for obtaining automatic temperature compensation voltage of a crystal oscillator.
Background
The temperature compensated crystal oscillator (TCXO) has the characteristics of low power consumption, easy miniaturization and the like, can work when being started, is widely applied to the industries of relevant electronic fields such as communication, electronic instruments, aerospace, national defense military industry and the like, and plays a role of a heart in an electronic system.
In practice, the temperature compensated crystal oscillator is formed by combining a compensation voltage generator with temperature dependence and a voltage controlled crystal oscillator (VCXO), in the practical application process, the voltage controlled crystal oscillator is susceptible to the influence of the ambient temperature to cause the output frequency to drift, the relationship between the temperature and the frequency is shown by a temperature-frequency characteristic curve diagram shown in fig. 1, and in general, the temperature-frequency characteristic of the voltage controlled crystal oscillator can be approximated to a high-order curve, which is expressed as:
f(T)＝a 5 (T-T 0 ) 5 +a 3 (T-T 0 ) 3 +a 1 (T-T 0 )+a 0
wherein, a 5 Is a coefficient term of five times a 3 Is a cubic coefficient term of 1 Is a first order coefficient term 0 Is T 0 Frequency of oscillation of time, T 0 Is the reference temperature.
For the voltage-controlled crystal oscillator, the output frequency of the voltage-controlled crystal oscillator can change along with the voltage change of the voltage-controlled input terminal within a certain range, and the linear gain of the voltage-controlled characteristic can be approximately expressed as follows by frequency-voltage-controlled characteristic:
f(VG)＝-G(VC-VC 0 )+f 0
wherein G is the voltage-controlled-frequency gain of the VCXO, VC is the control input voltage of the VCXO, VC 0 Is the central voltage-controlled voltage of VCXO voltage-controlled terminal, f 0 Is input as VC 0 The target oscillation frequency of the time.
Therefore, the equation of the voltage vc (t) for compensating the crystal temperature characteristic can be expressed as:
VC(T)＝A 5 (T-T 0 ) 5 +A 3 (T-T 0 ) 3 +A 1 (T-T 0 )+A 0
at this time, A 5 ＝a 5 /G，A 3 ＝a 3 /G，A 1 ＝a 1 /G，A 0 At a temperature of T 0 The compensation voltage of time.
In order to reduce the output frequency drift of the crystal oscillator caused by temperature, a temperature compensation voltage is required to be generated and loaded on the voltage-controlled end of the voltage-controlled crystal oscillator to perform temperature compensation so as to offset the temperature characteristic of the frequency, so that stable frequency output in a wider temperature range is obtained, and the purpose of temperature compensation is achieved.
At present, there are two main methods for obtaining the temperature compensation voltage required by the temperature compensated crystal oscillator:
first, a conventional manner for manually acquiring the temperature compensation voltage is adopted, and fig. 2 shows a schematic structural diagram of a system for manually acquiring the temperature compensation voltage, which includes the following specific processes: placing a voltage-controlled crystal oscillator to be compensated in a high-low temperature test box, supplying power to the voltage-controlled crystal oscillator by using a first direct-current stabilized power supply, connecting a second direct-current stabilized power supply to a voltage-controlled voltage input end of the voltage-controlled crystal oscillator to be compensated, and connecting an output end of the voltage-controlled crystal oscillator to be compensated to a frequency meter; when the temperature of the high-low temperature test chamber is 25 ℃, the output voltage of the second direct-current stabilized power supply is manually adjusted to enable the output frequency of the voltage-controlled crystal oscillator to be compensated to be the target frequency f 0 Record the voltage-controlled voltage VC at this time 0 And then, changing the temperature of the high-low temperature test box, repeating the steps to obtain corresponding frequency and voltage-controlled voltage at a plurality of different temperature points, and finally obtaining temperature compensation voltage under different temperature conditions in a fitting mode to establish a temperature-compensation voltage data table required by the temperature compensation crystal oscillator.
In the second way, a schematic diagram of a system structure for automatically acquiring the temperature compensation voltage is shown in fig. 3, and specifically, reference may be made to the contents disclosed in two patent documents of the invention in china with publication numbers CN104467674B and CN106603011B, in this way, the high and low temperature test chamber is controlled by a computer, and the voltage-controlled voltage is sequentially output by an ARM control unit, so that the voltage-controlled crystal oscillator to be compensated outputs the target frequency. The specific process comprises the following steps: the voltage controlled crystal oscillator to be compensated is placed in a high-low temperature test box, and the output end of the voltage controlled crystal oscillator to be compensated is connected to a frequency meterThe rate meter is connected to an upper computer, the upper computer controls the high-low temperature test chamber to set the temperature, and the temperature of the high-low temperature test chamber is T 1 Simultaneously controlling the ARM control unit to output the voltage-controlled voltage V 1 Recording frequency meter data f 11 Thereby obtaining a set of ambient temperature, voltage-controlled voltage and output frequency (T) 1 ,V 1 ,f 11 ) Repeating the above steps to change the temperature and voltage of the high-low temperature test chamber, recording the data of the frequency meter, and obtaining the limited group data (T) i ，V j ，f ij ) Then f is obtained by fitting a binary function s And finally, introducing the binary function into the ARM control unit to establish a temperature-compensation voltage data table required by the voltage-controlled crystal oscillator to be compensated for outputting the target frequency.
However, the two methods for obtaining the temperature compensation voltage require to continuously adjust the voltage-controlled voltage at the voltage-controlled end of the voltage-controlled crystal oscillator to be compensated manually or by using an upper computer, which may cause a long time for obtaining the temperature compensation voltage, and both curve fitting and manual adjustment have a problem in accuracy, thereby affecting the final compensation accuracy.
Disclosure of Invention
The invention aims to provide a device and a method for acquiring the automatic temperature compensation voltage of a crystal oscillator, which are used for solving the technical problems of overlong acquisition time, low precision and the like in the process of acquiring the temperature compensation voltage in the prior art, so that the acquisition efficiency and the accuracy of the temperature compensation voltage of the crystal oscillator are improved.
The purpose of the invention is realized by the following technical scheme:
in one aspect, the present invention provides an apparatus for obtaining an automatic temperature compensation voltage of a crystal oscillator, including:
a high and low temperature test chamber;
the voltage-controlled crystal oscillator is placed in the high-low temperature test box and is used for outputting a frequency signal to be compensated;
the external high-stability reference crystal oscillator is used for outputting a reference frequency signal;
the first frequency division circuit is used for receiving a frequency signal to be compensated output by the voltage-controlled crystal oscillator and dividing the frequency signal to be compensated to output a first frequency division signal;
the second frequency dividing circuit is used for receiving a reference frequency signal output by the external high-stability reference crystal oscillator and dividing the frequency of the reference frequency signal to output a second frequency dividing signal; and the number of the first and second groups,
and the phase comparison circuit is used for receiving the first frequency division signal output by the first frequency division circuit and the second frequency division signal output by the second frequency division circuit, comparing the first frequency division signal with the second frequency division signal to obtain the phase deviation of the first frequency division signal and the second frequency division signal, and finally converting the phase deviation into a compensation voltage signal with a corresponding size and outputting the compensation voltage signal.
Optionally, the crystal oscillator automatic temperature compensation voltage obtaining apparatus further includes:
and the low-pass filter is used for receiving the compensation voltage signal output by the phase comparison circuit, filtering the compensation voltage signal and outputting the filtered compensation voltage signal.
Optionally, the crystal oscillator automatic temperature compensation voltage obtaining apparatus further includes:
and the direct-current stabilized voltage supply is used for supplying power to the voltage-controlled crystal oscillator, the external high-stability reference crystal oscillator, the first frequency dividing circuit, the second frequency dividing circuit, the phase comparison circuit and the low-pass filter.
On the other hand, the invention provides a method for obtaining the automatic temperature compensation voltage of the crystal oscillator, which adopts the device for obtaining the automatic temperature compensation voltage of the crystal oscillator and comprises the following steps:
s1, placing a voltage-controlled crystal oscillator inside a high-low temperature test box;
s2, supplying power to the voltage-controlled crystal oscillator, the external high-stability reference crystal oscillator, the first frequency dividing circuit, the second frequency dividing circuit, the phase comparison circuit and the low-pass filter by using a direct-current stabilized power supply;
and S3, sequentially adjusting the high-low temperature test box to different temperatures, and respectively measuring and recording the output voltages of the low-pass filters at different temperatures so as to establish a temperature-compensation voltage data table of the voltage-controlled crystal oscillator in the full temperature range.
Further, step S1 further includes:
and setting the frequency division coefficients of the first frequency division circuit and the second frequency division circuit to ensure that the frequency of the first frequency division signal which is output by the voltage-controlled crystal oscillator and subjected to frequency division by the first frequency division circuit and the frequency of the second frequency division signal which is output by the external high-stability reference crystal oscillator and subjected to frequency division by the second frequency division circuit are equal.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
1. the invention divides the frequency of the frequency signal to be compensated output by the voltage-controlled crystal oscillator by using the first frequency dividing circuit, divides the frequency of the reference frequency signal output by the external high-stability reference crystal oscillator by using the second frequency dividing circuit, compares the frequency-divided signals divided by the first frequency dividing circuit and the second frequency dividing circuit by using the phase comparison circuit to obtain the phase deviation between the two frequency-divided signals, and converts the obtained phase deviation into the compensation voltage signal to obtain the temperature compensation voltage of the voltage-controlled crystal oscillator.
2. According to the invention, the voltage-controlled crystal oscillator is placed in the high-low temperature test box, and the external high-stability reference crystal oscillator, the first frequency dividing circuit, the second frequency dividing circuit, the phase comparison circuit, the low-pass filter and other modules are arranged in an environment with constant external temperature, so that the accuracy of acquiring the temperature compensation voltage can be effectively improved.
Drawings
FIG. 1 is a diagram illustrating an exemplary frequency-temperature characteristic of a conventional VCO;
FIG. 2 is a schematic diagram of a conventional system for manually obtaining a temperature compensation voltage;
FIG. 3 is a schematic diagram of a conventional system for obtaining temperature compensation voltage in an automatic manner;
fig. 4 is a schematic structural diagram of an automatic temperature compensation voltage obtaining apparatus for a crystal oscillator according to an embodiment of the present invention.
Detailed Description
Examples
Referring to fig. 4, the present embodiment provides an apparatus for obtaining an automatic temperature compensation voltage of a crystal oscillator, including a high/low temperature test box, a voltage controlled crystal oscillator, an external high-stability reference crystal oscillator, a first frequency dividing circuit, a second frequency dividing circuit, a phase comparison circuit, a low pass filter, and a dc regulated power supply (not shown in the figure), wherein the voltage controlled crystal oscillator is substantially the crystal oscillator to be compensated, and the dc regulated power supply is configured to provide electric energy required for normal operation for the voltage controlled crystal oscillator, the external high-stability reference crystal oscillator, the first frequency dividing circuit, the second frequency dividing circuit, the phase comparison circuit, and the low pass filter.
In this embodiment, the voltage-controlled crystal oscillator for outputting the frequency signal to be compensated is placed inside the high-low temperature test chamber, so that the voltage-controlled crystal oscillator can operate under various different temperature conditions to simulate the real operating environment of the voltage-controlled crystal oscillator.
In this embodiment, the external high-stability reference crystal oscillator is used to output a reference frequency signal, and it can be understood that the external high-stability reference crystal oscillator is a crystal oscillator with high frequency-temperature stability, and the external high-stability reference crystal oscillator is used as a reference to obtain the temperature compensation voltage of the voltage-controlled crystal oscillator, so that the accuracy of obtaining the temperature compensation voltage can be effectively improved.
In this embodiment, the first frequency-dividing circuit is configured to receive a frequency signal to be compensated output by the voltage-controlled crystal oscillator, and at this time, the frequency signal to be compensated output by the voltage-controlled crystal oscillator can be divided by the first frequency-dividing circuit, so that the first frequency-dividing circuit is used to output a corresponding first frequency-dividing signal.
In this embodiment, the second frequency dividing circuit is configured to receive a reference frequency signal output by the external high-stability reference crystal oscillator, and at this time, the second frequency dividing circuit may be configured to divide the frequency of the reference frequency signal output by the external high-stability reference crystal oscillator, so as to output a corresponding second frequency dividing signal by the second frequency dividing circuit.
In this embodiment, the phase comparison circuit is configured to receive a first frequency-divided signal output by the first frequency-dividing circuit and a second frequency-divided signal output by the second frequency-dividing circuit, and at the same time, the phase comparison circuit can compare the received first frequency-divided signal and the received second frequency-divided signal to obtain a phase deviation between the two frequency-divided signals, and finally convert the phase deviation into a compensation voltage signal with a corresponding magnitude through the phase comparison circuit and output the compensation voltage signal.
Meanwhile, in order to further improve the accuracy of the obtained temperature compensation voltage, the compensation voltage signal output by the phase comparison circuit may be received by a low-pass filter, and the compensation voltage signal is filtered by the low-pass filter and then a corresponding compensation voltage signal is output, at this time, the compensation voltage corresponding to the compensation voltage signal output by the low-pass filter is the temperature compensation voltage of the voltage controlled crystal oscillator under the current temperature condition.
On the other hand, the embodiment further provides a method for obtaining the crystal oscillator automatic temperature compensation voltage, and the method for obtaining the crystal oscillator automatic temperature compensation voltage specifically comprises the following steps:
s1, the voltage-controlled crystal oscillator is placed inside a high-low temperature test box, so that the voltage-controlled crystal oscillator can operate under various different temperature conditions. Meanwhile, the frequency division coefficients of the first frequency dividing circuit and the second frequency dividing circuit are set so as to ensure that the frequency of the first frequency dividing signal which is output by the voltage-controlled crystal oscillator and subjected to frequency division by the first frequency dividing circuit is equal to the frequency of the second frequency dividing signal which is output by the external high-stability reference crystal oscillator and subjected to frequency division by the second frequency dividing circuit, and further improve the accuracy of the finally obtained temperature compensation voltage.
It should be noted that, when the frequency of the reference frequency signal output by the external high-stability reference crystal oscillator is greater than the frequency of the frequency signal to be compensated output by the voltage-controlled crystal oscillator, the frequency division coefficient of the first frequency division circuit corresponding to the voltage-controlled crystal oscillator is set to 1, and at this time, the reference frequency signal output by the external high-stability reference crystal oscillator is frequency-divided only by using the second frequency division circuit; when the frequency of the reference frequency signal output by the external high-stability reference crystal oscillator is equal to the frequency of the frequency signal to be compensated output by the voltage-controlled crystal oscillator, the frequency division coefficients of the first frequency dividing circuit and the second frequency dividing circuit are set to be 1, namely, the reference frequency signal output by the external high-stability reference crystal oscillator and the frequency signal to be compensated output by the voltage-controlled crystal oscillator are not divided.
And S2, respectively supplying power to the voltage-controlled crystal oscillator, the external high-stability reference crystal oscillator, the first frequency dividing circuit, the second frequency dividing circuit, the phase comparison circuit and the low-pass filter by using a direct-current stabilized power supply, so that the voltage-controlled crystal oscillator, the external high-stability reference crystal oscillator, the first frequency dividing circuit, the second frequency dividing circuit, the phase comparison circuit and the low-pass filter can continuously and reliably run normally.
And S3, sequentially adjusting the high-low temperature test box to different temperatures, and respectively measuring and recording the temperature compensation voltage output by the low-pass filter at different temperatures so as to establish a temperature-compensation voltage data table of the voltage-controlled crystal oscillator in the full temperature range. It can be understood that, in the process of obtaining the temperature compensation voltage of the vcxo, the temperature in the external environment should be kept constant (usually, room temperature) to avoid that the external high-stability reference crystal, the first frequency dividing circuit, the second frequency dividing circuit, the phase comparison circuit and the low-pass filter placed in the external environment are affected by the temperature change of the external environment.
Specifically, assume that the temperature range of the voltage controlled crystal oscillator during normal operation is the lowest temperature T min To the maximum temperature T max When obtaining the temperature compensation voltage, the temperature of the high-low temperature test chamber can be adjusted to the lowest temperature T min At the moment, the voltage-controlled crystal oscillator outputs a corresponding frequency signal to be compensated to the first frequency dividing circuit, the first frequency dividing circuit divides the frequency of the frequency signal to be compensated to output a first frequency dividing signal, the external high-stability reference crystal oscillator outputs a corresponding reference frequency signal to the second frequency dividing circuit, and the second frequency dividing circuit divides the frequency of the reference frequency signal to output a second frequency dividing signal; the phase comparison circuit receives the first frequency-divided signal output by the first frequency-dividing circuit and the second frequency-divided signal output by the second frequency-dividing circuitDividing the frequency signals by two, comparing the first frequency-divided signal with the second frequency-divided signal to obtain the phase deviation between the two frequency-divided signals, and finally converting the phase deviation into compensation voltage signals with corresponding sizes and outputting the compensation voltage signals to a low-pass filter; the low-pass filter filters the received compensation voltage signal to obtain the lowest temperature T by measuring the compensation voltage signal min The temperature compensation voltage of the voltage controlled crystal oscillator. And the rest is done in sequence, and the temperature of the high-low temperature test chamber is changed from the lowest temperature T min Adjusted to the maximum temperature T max The minimum temperature T can be obtained min To the maximum temperature T max A series of temperature compensation voltage data of the voltage controlled crystal oscillator in the temperature range (namely, in the full temperature range) can be established, thereby establishing a temperature-compensation voltage data table of the voltage controlled crystal oscillator in the full temperature range.
It should be noted that, when actually obtaining the temperature compensation voltage of the vcxo within the full temperature range, the temperature of the high and low temperature test chamber may be adjusted to the maximum temperature T first max Then, sequentially controlling the temperature of the high-low temperature test chamber from the highest temperature T max Adjusted to the minimum temperature T min The temperature compensation voltage of the voltage-controlled crystal oscillator in the full temperature range can be obtained, and the adjustment sequence of the temperature of the high-low temperature test box is not limited herein.
Therefore, the device and the method for obtaining the automatic temperature compensation voltage of the crystal oscillator provided by the embodiment can be seen in that an external high-stability reference crystal oscillator serving as a reference is additionally arranged, the first frequency dividing circuit, the second frequency dividing circuit and the phase comparison circuit are matched, the first frequency dividing circuit is used for dividing the frequency signal to be compensated output by the voltage-controlled crystal oscillator, the second frequency dividing circuit is used for dividing the frequency signal of the reference frequency output by the external high-stability reference crystal oscillator, the phase comparison circuit is used for comparing the frequency divided signals after frequency division by the first frequency dividing circuit and the second frequency dividing circuit to obtain the phase deviation between the two frequency divided signals, the obtained phase deviation is converted into the compensation voltage signal with the corresponding size to obtain the temperature compensation voltage of the voltage-controlled crystal oscillator, and the voltage-controlled voltage at the voltage-controlled end of the voltage-controlled crystal oscillator does not need to be adjusted manually or by an upper computer in the whole process, therefore, the temperature compensation voltage acquisition efficiency of the voltage-controlled crystal oscillator is effectively improved. Meanwhile, in the whole process of acquiring the temperature compensation voltage, only the voltage-controlled crystal oscillator is placed in the high-low temperature test box, and modules such as an external high-stability reference crystal oscillator, a first frequency dividing circuit, a second frequency dividing circuit, a phase comparison circuit, a low-pass filter and the like are arranged in an environment with constant external temperature, so that the accuracy of acquiring the temperature compensation voltage can be effectively improved.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. An apparatus for obtaining a voltage for automatic temperature compensation of a crystal oscillator, comprising:
a high and low temperature test chamber;
the voltage-controlled crystal oscillator is placed in the high-low temperature test box and is used for outputting a frequency signal to be compensated;
the external high-stability reference crystal oscillator is used for outputting a reference frequency signal;
the first frequency division circuit is used for receiving a frequency signal to be compensated output by the voltage-controlled crystal oscillator and dividing the frequency signal to be compensated to output a first frequency division signal;
the second frequency dividing circuit is used for receiving a reference frequency signal output by the external high-stability reference crystal oscillator and dividing the frequency of the reference frequency signal to output a second frequency dividing signal; and the number of the first and second groups,
and the phase comparison circuit is used for receiving the first frequency division signal output by the first frequency division circuit and the second frequency division signal output by the second frequency division circuit, comparing the first frequency division signal with the second frequency division signal to obtain the phase deviation of the first frequency division signal and the second frequency division signal, and finally converting the phase deviation into a compensation voltage signal with a corresponding size and outputting the compensation voltage signal.
2. The crystal oscillator automatic temperature compensation voltage acquisition device of claim 1, further comprising:
and the low-pass filter is used for receiving the compensation voltage signal output by the phase comparison circuit, filtering the compensation voltage signal and outputting the filtered compensation voltage signal.
3. The crystal oscillator automatic temperature compensation voltage acquisition device of claim 2, further comprising:
and the direct-current stabilized voltage supply is used for supplying power to the voltage-controlled crystal oscillator, the external high-stability reference crystal oscillator, the first frequency dividing circuit, the second frequency dividing circuit, the phase comparison circuit and the low-pass filter.
4. A crystal oscillator automatic temperature compensation voltage obtaining method using the crystal oscillator automatic temperature compensation voltage obtaining apparatus according to any one of claims 1 to 3, comprising the steps of:
s1, placing a voltage-controlled crystal oscillator inside a high-low temperature test box;
s2, supplying power to the voltage-controlled crystal oscillator, the external high-stability reference crystal oscillator, the first frequency dividing circuit, the second frequency dividing circuit, the phase comparison circuit and the low-pass filter by using a direct-current stabilized power supply;
and S3, sequentially adjusting the high-low temperature test box to different temperatures, and respectively measuring and recording the temperature compensation voltage output by the low-pass filter at different temperatures so as to establish a temperature-compensation voltage data table of the voltage-controlled crystal oscillator in the full temperature range.
5. The crystal oscillator automatic temperature compensation voltage obtaining method of claim 4, wherein the step S1 further comprises:
and setting the frequency division coefficients of the first frequency division circuit and the second frequency division circuit to ensure that the frequency of the first frequency division signal which is output by the voltage-controlled crystal oscillator and subjected to frequency division by the first frequency division circuit and the frequency of the second frequency division signal which is output by the external high-stability reference crystal oscillator and subjected to frequency division by the second frequency division circuit are equal.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117353732A (en) * | 2023-11-08 | 2024-01-05 | 武汉非秒迅连科技有限公司 | Constant-temperature crystal oscillator temperature compensation method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117353732A (en) * | 2023-11-08 | 2024-01-05 | 武汉非秒迅连科技有限公司 | Constant-temperature crystal oscillator temperature compensation method and device |
| CN117353732B (en) * | 2023-11-08 | 2024-04-16 | 武汉非秒迅连科技有限公司 | Constant-temperature crystal oscillator temperature compensation method and device |
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