CN106911352A - Oscillator signal generative circuit, digital intercom terminal and production method - Google Patents
Oscillator signal generative circuit, digital intercom terminal and production method Download PDFInfo
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- CN106911352A CN106911352A CN201710044934.9A CN201710044934A CN106911352A CN 106911352 A CN106911352 A CN 106911352A CN 201710044934 A CN201710044934 A CN 201710044934A CN 106911352 A CN106911352 A CN 106911352A
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- oscillator signal
- load capacitance
- compensation
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L1/00—Stabilisation of generator output against variations of physical values, e.g. power supply
- H03L1/02—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only
- H03L1/022—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only by indirect stabilisation, i.e. by generating an electrical correction signal which is a function of the temperature
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
Abstract
The invention provides a kind of oscillator signal generative circuit, digital intercom terminal and production method, the circuit includes concussion crystal and load capacitance compensated circuit, and concussion crystal is used to produce oscillator signal；Load capacitance compensated circuit is used for compensation concussion crystal is influenceed the frequency error of caused oscillator signal to change by ambient parameter.So the present invention produces oscillator signal using common concussion crystal, change the actual loading electric capacity of concussion crystal with the change of ambient parameter by load capacitance compensated circuit realiration, influenceed the frequency error of caused oscillator signal to change by ambient parameter to compensate concussion crystal；Thus can be while equipment cost be reduced so that the concussion frequency error of oscillator signal will not change too big, it is ensured that communication quality.
Description
Technical field
The present invention relates to digital intercom field, more particularly to a kind of oscillator signal generative circuit, digital intercom terminal and life
Product method.
Background technology
All include crystal oscillator in existing intercommunication field, intercommunication terminal, that is, shake crystal, the effect of crystal is for circuit is provided
One reference frequency, the frequency required for obtaining system by the frequency multiplication to reference frequency or frequency dividing.And whether reference frequency is smart
Really, the reliability of system is stably directly affected.For intercom, the most important index of reliability effect of reference frequency-
Receiving sensitivity.
But, in actual applications, the cost of the concussion crystal that difference is required is differed, and such as precision is ± 2.5ppm's
TCXO (Temperature Compensate X'tal (crystal) Oscillator) is the temperature-compensation circuit by adding
A kind of quartz oscillator for cutting down the frequency of oscillation variable quantity produced by environment temperature change, its cost is just very high.
It is just improper in some application scenarios, such as toy radio phone, and if directly using common concussion crystal generation oscillator signal, frequency
Rate error changes than larger with ambient parameters such as temperature, influences the experience of user.
The content of the invention
The invention provides a kind of oscillator signal generative circuit, digital intercom terminal and production method, to solve existing number
Word intercom is influenceed larger problem using the frequency error that common concussion crystal is present by ambient parameter change.
The invention provides a kind of oscillator signal generative circuit, including concussion crystal and load capacitance compensated circuit, concussion
Crystal is used to produce oscillator signal；Load capacitance compensated circuit is used for compensation concussion crystal is influenceed caused concussion by ambient parameter
The frequency error change of signal.
Further, the concussion frequency of oscillator signal changes, oscillator signal as the ambient parameter of Run-time scenario changes
The frequency error variation tendency of concussion frequency and target frequency and the ambient parameter variation tendency of Run-time scenario it is corresponding in first
Relation；The concussion frequency of oscillator signal changes with the load capacitance change of concussion crystal, and the frequency error of oscillator signal becomes
Change trend is in the second corresponding relation with load capacitance variation tendency；Load capacitance compensated circuit is used to provide load capacitance, including：
Change-over circuit and compensation circuit, change-over circuit are used to be produced according to the change of ambient parameter the compensation electric signal of change, compensation electricity
The load capacitance that road is used for the compensation electric signal control concussion crystal according to change changes with the change of ambient parameter, controls
Load capacitance variation tendency is in the 3rd corresponding relation, the first corresponding relation and second with the ambient parameter variation tendency of Run-time scenario
Corresponding relation is based on the 3rd corresponding relation, is complementary corresponding relation.
Further, change-over circuit at least includes a thermistor, and compensation circuit at least includes a varactor；
The resistance of thermistor changes according to the change of temperature in ambient parameter, and the change in resistance of thermistor causes varactor
Partial pressure change, the partial pressure change of varactor causes the capacitance variations of varactor.
Further, also including variable resistor and filter capacitor, variable resistor is used for regulating load capacitor compensating circuit
Compensation range size and the compensation linearity, filter capacitor are used for the compensation range value of regulating load capacitor compensating circuit.
Further, the load capacitance compensated reference edge for being electrically connected to shake crystal.
The invention provides a kind of digital intercom terminal, it includes the oscillator signal that digital intercom chip and the present invention are provided
Generative circuit, the oscillator signal processing data that digital intercom chip is exported according to oscillator signal generative circuit.
The invention provides a kind of production method of digital intercom terminal, the digital intercom end for producing present invention offer
End, digital intercom terminal includes digital intercom chip and oscillator signal generative circuit, and oscillator signal generative circuit includes that concussion is brilliant
Body and load capacitance compensated circuit, load capacitance compensated circuit include change-over circuit and compensation circuit；Production method includes：
The Run-time scenario of simulation concussion crystal, the concussion frequency and target frequency of the oscillator signal of detection concussion crystal output
Frequency error；
Between the frequency error variation tendency and the ambient parameter variation tendency of Run-time scenario of acquisition oscillator signal first
Corresponding relation；
Obtain the second corresponding relation between the frequency error variation tendency and load capacitance variation tendency of oscillator signal；
Calculate the 3rd corresponding relation for the first corresponding relation and the second corresponding relation is formed complementary corresponding relation, the 3rd
Corresponding relation is the corresponding relation between load capacitance variation tendency and the ambient parameter variation tendency of Run-time scenario；
The type of change-over circuit and compensation circuit is selected according to the 3rd corresponding relation, change-over circuit is used for according to ambient parameter
Change produce change compensation electric signal, compensation circuit be used for according to change compensation electric signal control concussion crystal load
Electric capacity changes with the change of ambient parameter, the ambient parameter variation tendency of control load capacitance variation tendency and Run-time scenario
In the 3rd corresponding relation.
Further, the first corresponding relation is the frequency error of oscillator signal as the rising of temperature in ambient parameter is to negative
Direction offsets, as the reduction of temperature in ambient parameter offsets to positive direction；Second corresponding relation is missed for the frequency of oscillator signal
Difference offsets with the increase of load capacitance to negative direction, as the reduction of load capacitance offsets to positive direction；3rd corresponding relation
For load capacitance reduces with the rising of temperature in ambient parameter, increase with the reduction of temperature in ambient parameter.
Further, change-over circuit at least includes a thermistor, and compensation circuit at least includes a varactor；
The resistance of thermistor changes according to the change of temperature in ambient parameter, and the change in resistance of thermistor causes varactor
Partial pressure change, the partial pressure change of varactor causes the capacitance variations of varactor.
Further, also include：Compensation range size and the compensation linearity according to load capacitance compensated circuit are set can
Become resistance；Compensation range value according to load capacitance compensated circuit sets filter capacitor；Variable resistor is used for regulating load electric capacity
The compensation range size and the compensation linearity of compensation circuit, filter capacitor are used for the compensation range of regulating load capacitor compensating circuit
Value.
Beneficial effects of the present invention：
The invention provides a kind of new oscillator signal generative circuit, it uses common concussion crystal to produce concussion letter
Number, change the actual loading electric capacity of concussion crystal with the change of ambient parameter by load capacitance compensated circuit realiration, with
Compensation concussion crystal is influenceed the frequency error of caused oscillator signal to change by ambient parameter；Thus can reduce equipment into
This while so that the concussion frequency error of oscillator signal will not change too big, it is ensured that communication quality.
Brief description of the drawings
The structural representation of the oscillator signal generative circuit that Fig. 1 is provided for first embodiment of the invention；
Fig. 2 is the performance diagram of thermistor of the present invention；
Fig. 3 is the performance diagram of varactor of the present invention；
The circuit connection diagram of the oscillator signal generative circuit that Fig. 4 is provided for third embodiment of the invention.
Specific embodiment
The further annotation explanation of output is now done to the present invention by way of specific embodiment combination accompanying drawing.
First embodiment：
The structural representation of the oscillator signal generative circuit that Fig. 1 is provided for first embodiment of the invention, as shown in Figure 1,
In the present embodiment, the oscillator signal generative circuit that the present invention is provided includes：Concussion crystal 11 and load capacitance compensated circuit 12, shake
Crystal 11 is swung for producing oscillator signal；Load capacitance compensated circuit 12 is used for compensation concussion crystal to be influenceed to cause by ambient parameter
Oscillator signal frequency error change.
In certain embodiments, the concussion frequency of the oscillator signal in above-described embodiment is with the ambient parameter of Run-time scenario
Change and change, the ambient parameter of the concussion frequency of oscillator signal and the frequency error variation tendency of target frequency and Run-time scenario
Variation tendency is in the first corresponding relation；The concussion frequency of oscillator signal changes with the load capacitance change of concussion crystal, shakes
The frequency error variation tendency and load capacitance variation tendency for swinging signal are in the second corresponding relation；Load capacitance compensated circuit is used for
Load capacitance is provided, including：Change-over circuit 121 and compensation circuit 122, change-over circuit are used to be produced according to the change of ambient parameter
The compensation electric signal of change, compensation circuit is used for the load capacitance of the compensation electric signal control concussion crystal according to change with ring
The change of border parameter and change, the ambient parameter variation tendency of control load capacitance variation tendency and Run-time scenario is in the 3rd corresponding
Relation, the first corresponding relation and the second corresponding relation are based on the 3rd corresponding relation, are complementary corresponding relation.
In certain embodiments, the change-over circuit in above-described embodiment at least includes a thermistor, and compensation circuit is extremely
Include a varactor less；The resistance of thermistor changes according to the change of temperature in ambient parameter, thermistor
Change in resistance causes the partial pressure of varactor to change, and the partial pressure change of varactor causes the electric capacity of varactor to become
Change.
In certain embodiments, variable resistor and filter capacitor are also included in above-described embodiment, variable resistor is used to adjust
The compensation range size and the compensation linearity of load capacitance compensated circuit are saved, filter capacitor is used for regulating load capacitor compensating circuit
Compensation range value.
In certain embodiments, the load capacitance compensated reference edge for being electrically connected to shake crystal in above-described embodiment.
Corresponding, the invention provides a kind of digital intercom terminal, it includes what digital intercom chip and the present invention were provided
Oscillator signal generative circuit, the oscillator signal processing data that digital intercom chip is exported according to oscillator signal generative circuit.
It is corresponding, the invention provides a kind of production method of digital intercom terminal, the number for producing present invention offer
Word intercommunication terminal, digital intercom terminal includes digital intercom chip and oscillator signal generative circuit, oscillator signal generative circuit bag
Concussion crystal and load capacitance compensated circuit are included, load capacitance compensated circuit includes change-over circuit and compensation circuit；Production method
Including：
The Run-time scenario of simulation concussion crystal, the concussion frequency and target frequency of the oscillator signal of detection concussion crystal output
Frequency error；
Between the frequency error variation tendency and the ambient parameter variation tendency of Run-time scenario of acquisition oscillator signal first
Corresponding relation；
Obtain the second corresponding relation between the frequency error variation tendency and load capacitance variation tendency of oscillator signal；
Calculate the 3rd corresponding relation for the first corresponding relation and the second corresponding relation is formed complementary corresponding relation, the 3rd
Corresponding relation is the corresponding relation between load capacitance variation tendency and the ambient parameter variation tendency of Run-time scenario；
The type of change-over circuit and compensation circuit is selected according to the 3rd corresponding relation, change-over circuit is used for according to ambient parameter
Change produce change compensation electric signal, compensation circuit be used for according to change compensation electric signal control concussion crystal load
Electric capacity changes with the change of ambient parameter, the ambient parameter variation tendency of control load capacitance variation tendency and Run-time scenario
In the 3rd corresponding relation.
In certain embodiments, the first corresponding relation in above-described embodiment is the frequency error of oscillator signal with environment
The rising of temperature offsets to negative direction in parameter, as the reduction of temperature in ambient parameter offsets to positive direction；Second correspondence is closed
Be for oscillator signal frequency error with load capacitance increase to negative direction offset, as the reduction of load capacitance is to pros
To skew；3rd corresponding relation reduces for load capacitance with the rising of temperature in ambient parameter, with the middle temperature of ambient parameter
The reduction of degree and increase.
In certain embodiments, the change-over circuit in above-described embodiment at least includes a thermistor, and compensation circuit is extremely
Include a varactor less；The resistance of thermistor changes according to the change of temperature in ambient parameter, thermistor
Change in resistance causes the partial pressure of varactor to change, and the partial pressure change of varactor causes the electric capacity of varactor to become
Change.
In certain embodiments, the method in above-described embodiment also includes：Compensation model according to load capacitance compensated circuit
Enclose size and the compensation linearity sets variable resistor；Compensation range value according to load capacitance compensated circuit sets filter capacitor；
Variable resistor is used for the compensation range size and the compensation linearity of regulating load capacitor compensating circuit, and filter capacitor is used to adjust negative
Carry the compensation range value of capacitor compensating circuit.
Further annotation explanation is done to the present invention in conjunction with concrete application scene.
Second embodiment：
The present embodiment is illustrated by taking the concussion crystal for producing 26M to shake frequency as an example.
In actual applications, by with the comprehensive method surveyed in the straight measured frequency error of crystal VCON pin, producing 26M concussions
The concussion crystal of frequency measures frequency error and is offset toward negative direction, as shown in table 1 with the rising of temperature：
Table 1
Increase its load capacitance (C48 or D4) crystal frequency error toward negative offset；Reduce load capacitance (C48 or D4) frequency
Error offsets toward positive direction.
For the thermistor that this hair is related to, in the circuit, selection is negative temperature coefficient (i.e. temperature and resistance negative
Close, temperature gets over that high value is smaller, and temperature more low resistance is bigger) resistance, the type resistance temperature such as schemes with change in resistance curve
Shown in 2.
For the varactor that this hair is related to, in the circuit, selection is 1SV278 diodes, its varactor
Characteristic is as shown in Figure 3.
Because common crystal is unstable with variation of ambient temperature, the total thinking of the present embodiment is：Make crystal load capacitance
Size is varied with temperature, and is changed with this and to be corrected crystal frequency.Can so make common crystal more stable in temperature change；
Specific circuit is as shown in Figure 4.
In the embodiment shown in fig. 4, realize that variation of ambient temperature is converted into crystal load capacitance change main devices and is：
Thermistor RJ1, varactor 1SV278 (or BB181).When environment temperature is low (frequency error toward positive offset), RJ1 becomes
Greatly, the partial pressure of D4 diminishes, and the load capacitance of the Vcon pin of the characteristic crystal Y1 according to varactor becomes big so that frequency error
Retracted toward negative direction；When environment temperature is (frequency error toward negative offset) high, RJ1 diminishes, and the partial pressure of D4 becomes big, the Vcon of crystal Y1
The load capacitance of pin diminishes so that frequency error is retracted toward positive direction.
Adjustable resistance VR1 and D4 realize the adjustable function of frequency error, R33 and RJ1 resistances in the embodiment shown in fig. 4
The size of size influence frequency error adjustable extent and the linearity of compensation；C48 and C17 values determine that can frequency error
+/- scope skew.
In summary, by implementation of the invention, at least there is following beneficial effect：
The invention provides a kind of new oscillator signal generative circuit, it uses common concussion crystal to produce concussion letter
Number, change the actual loading electric capacity of concussion crystal with the change of ambient parameter by load capacitance compensated circuit realiration, with
Compensation concussion crystal is influenceed the frequency error of caused oscillator signal to change by ambient parameter；Thus can reduce equipment into
This while so that the concussion frequency error of oscillator signal will not change too big, it is ensured that communication quality.
The above is only specific embodiment of the invention, any formal limitation is not done to the present invention, it is every
Any simple modification made to embodiment of above according to technical spirit of the invention, equivalent variations, with reference to or modification, still
Belong to the protection domain of technical solution of the present invention.
Claims (10)
1. a kind of oscillator signal generative circuit, it is characterised in that including concussion crystal and load capacitance compensated circuit, the concussion
Crystal is used to produce oscillator signal；The load capacitance compensated circuit is influenceed to lead for compensating the concussion crystal by ambient parameter
The frequency error change of the oscillator signal for causing.
2. oscillator signal generative circuit as claimed in claim 1, it is characterised in that the concussion frequency of the oscillator signal with
The ambient parameter of Run-time scenario changes and changes, and the concussion frequency of the oscillator signal becomes with the frequency error change of target frequency
Gesture is in the first corresponding relation with the ambient parameter variation tendency of the Run-time scenario；The concussion frequency of the oscillator signal is with institute
State the load capacitance change of concussion crystal and change, frequency error variation tendency and the load capacitance of the oscillator signal become
Change trend is in the second corresponding relation；The load capacitance compensated circuit is used to provide the load capacitance, including：Change-over circuit and
Compensation circuit, the change-over circuit is used to be produced according to the change of the ambient parameter compensation electric signal of change, the compensation
Circuit is used for the load capacitance of the compensation electric signal control concussion crystal according to the change with the ambient parameter
Change and change, control the load capacitance variation tendency corresponding in the 3rd with the ambient parameter variation tendency of the Run-time scenario
Relation, first corresponding relation is based on the 3rd corresponding relation with second corresponding relation, is complementary corresponding relation.
3. oscillator signal generative circuit as claimed in claim 2, it is characterised in that the change-over circuit at least includes a heat
Quick resistance, the compensation circuit at least includes a varactor；The resistance of the thermistor is according to the ambient parameter
The change of middle temperature and change, the change in resistance of the thermistor causes the partial pressure of the varactor to change, the change
The partial pressure change for holding diode causes the capacitance variations of the varactor.
4. oscillator signal generative circuit as claimed in claim 2, it is characterised in that also including variable resistor and filter capacitor,
The variable resistor is used to adjust the compensation range size and the compensation linearity of the load capacitance compensated circuit, the filtered electrical
Hold the compensation range value for adjusting the load capacitance compensated circuit.
5. the oscillator signal generative circuit as described in any one of Claims 1-4, it is characterised in that described load capacitance compensated
It is electrically connected to the reference edge of the concussion crystal.
6. a kind of digital intercom terminal, it is characterised in that including digital intercom chip and as described in any one of claim 1 to 5
Oscillator signal generative circuit, the oscillator signal treatment that the digital intercom chip is exported according to the oscillator signal generative circuit
Data.
7. a kind of production method of digital intercom terminal, it is characterised in that for producing digital intercom as claimed in claim 5
Terminal, the digital intercom terminal includes digital intercom chip and oscillator signal generative circuit, the oscillator signal generative circuit
Including concussion crystal and load capacitance compensated circuit, the load capacitance compensated circuit includes change-over circuit and compensation circuit；Institute
Stating production method includes：
The Run-time scenario of the simulation concussion crystal, detects the concussion frequency and target of the oscillator signal of the concussion crystal output
The frequency error of frequency；
Obtain between the frequency error variation tendency of the oscillator signal and the ambient parameter variation tendency of the Run-time scenario
First corresponding relation；
Obtain the second corresponding pass between the frequency error variation tendency of the oscillator signal and the load capacitance variation tendency
System；
The 3rd corresponding relation for causing first corresponding relation that complementary corresponding relation is formed with second corresponding relation is calculated,
3rd corresponding relation is between the load capacitance variation tendency and the ambient parameter variation tendency of the Run-time scenario
Corresponding relation；
The type of the change-over circuit and compensation circuit is selected according to the 3rd corresponding relation, the change-over circuit is used for basis
The change of the ambient parameter produces the compensation electric signal of change, and the compensation circuit is used for the compensation telecommunications according to the change
The load capacitance of number control concussion crystal changes with the change of the ambient parameter, controls load capacitance change
Trend is in the 3rd corresponding relation with the ambient parameter variation tendency of the Run-time scenario.
8. production method as claimed in claim 7, it is characterised in that first corresponding relation is the frequency of the oscillator signal
Rate error with temperature in the ambient parameter rising to negative direction offset, with temperature in the ambient parameter reduction to
Positive direction offsets；Second corresponding relation is the frequency error of the oscillator signal as the increase of the load capacitance is to negative
Direction offsets, as the reduction of the load capacitance offsets to positive direction；3rd corresponding relation be the load capacitance with
The rising of temperature in the ambient parameter and reduce, increase with the reduction of temperature in the ambient parameter.
9. production method as claimed in claim 7, it is characterised in that the change-over circuit at least includes a thermistor,
The compensation circuit at least includes a varactor；The resistance of the thermistor is according to temperature in the ambient parameter
Change and change, the change in resistance of the thermistor causes the partial pressure of the varactor to change, the varactor
Partial pressure change cause the capacitance variations of the varactor.
10. the production method as described in any one of claim 7 to 9, it is characterised in that also include：According to the load capacitance
The compensation range size and the compensation linearity of compensation circuit set variable resistor；According to the compensation of the load capacitance compensated circuit
Value range sets filter capacitor；The variable resistor is used to adjust the compensation range size and benefit of the load capacitance compensated circuit
The linearity is repaid, the filter capacitor is used to adjust the compensation range value of the load capacitance compensated circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710044934.9A CN106911352A (en) | 2017-01-19 | 2017-01-19 | Oscillator signal generative circuit, digital intercom terminal and production method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710044934.9A CN106911352A (en) | 2017-01-19 | 2017-01-19 | Oscillator signal generative circuit, digital intercom terminal and production method |
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Family
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| CN201710044934.9A Pending CN106911352A (en) | 2017-01-19 | 2017-01-19 | Oscillator signal generative circuit, digital intercom terminal and production method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112422084A (en) * | 2019-08-20 | 2021-02-26 | Oppo广东移动通信有限公司 | Temperature compensation method and device for crystal oscillator, electronic device and storage medium |
| CN112422084B (en) * | 2019-08-20 | 2024-04-19 | Oppo广东移动通信有限公司 | Temperature compensation method and device for crystal oscillator, electronic equipment and storage medium |
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| CN1411288A (en) * | 2001-10-10 | 2003-04-16 | 德金通电讯（深圳）有限公司 | Intercom crystal oscillator digital temperature compensating method and its system |
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| CN201243273Y (en) * | 2008-07-08 | 2009-05-20 | 广州市天马电讯科技有限公司 | Temperature complement voltage-control constant temperature crystal oscillator |
| CN102176654A (en) * | 2010-12-27 | 2011-09-07 | 北京遥测技术研究所 | Broadband, high-linearity and low-phase noise frequency modulation (FM) modulator |
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| CN1411288A (en) * | 2001-10-10 | 2003-04-16 | 德金通电讯（深圳）有限公司 | Intercom crystal oscillator digital temperature compensating method and its system |
| CN2511047Y (en) * | 2001-12-20 | 2002-09-11 | 华中科技大学 | Microcomputer temperature-compensated crystal oscillator |
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| CN201243273Y (en) * | 2008-07-08 | 2009-05-20 | 广州市天马电讯科技有限公司 | Temperature complement voltage-control constant temperature crystal oscillator |
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| CN112422084A (en) * | 2019-08-20 | 2021-02-26 | Oppo广东移动通信有限公司 | Temperature compensation method and device for crystal oscillator, electronic device and storage medium |
| CN112422084B (en) * | 2019-08-20 | 2024-04-19 | Oppo广东移动通信有限公司 | Temperature compensation method and device for crystal oscillator, electronic equipment and storage medium |
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