CN1705222A - Temperature-compensating method for quartz crystal oscillator - Google Patents

Temperature-compensating method for quartz crystal oscillator Download PDF

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Publication number
CN1705222A
CN1705222A CN 200410022680 CN200410022680A CN1705222A CN 1705222 A CN1705222 A CN 1705222A CN 200410022680 CN200410022680 CN 200410022680 CN 200410022680 A CN200410022680 A CN 200410022680A CN 1705222 A CN1705222 A CN 1705222A
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frequency
temperature
signal
compensating
compensation
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CN100471035C (en
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黄显核
黎敏强
付玮
谭锋
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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Abstract

A temperature compensation method for quartz crystal oscillator, the temperature sensor and compensation frequency generation circuit producing a compensation frequency signal having equal absolute value and opposite sign with the deviation frequency value produced by uncompensated quartz crystal oscillator, said compensation frequency signal mixed and outputted with the uncompensated frequency signal after wave shaping, obtaining compensated frequency signal after filtering by filter, said invention has low phase noise and can make effective temperature compensation to high frequency overtone quartz crystal oscillator.

Description

A kind of quartz oscillator temperature compensation
Technical field
The invention belongs to electronic technology field, it is particularly related to the quartz oscillator technique for temperature compensation.
Background technology
At present, two kinds of the quartz oscillator temperature compensation mainly contains analog (thermistor network control variable capacitance diode such as Fig. 1) and computer compensations, wherein analog ripe basically, its deficiency is that productivity is too poor.The method of microcomputer temperature compensating crystal oscillator (as shown in Figure 2) is by microprocessor output bucking voltage, give the device of the transfiguration in the oscillation circuit this bucking voltage again, when the bucking voltage change, thereby the capacitance of transfiguration device changes the purpose that the output frequency of oscillator reaches control frequency thereupon.Thereby these two kinds of methods all are to utilize variable capacitance diode or change tank capacitance control frequency (following Fig. 1, shown in Figure 2) by the switching capacity battle array that (Fig. 1 comes from Zhao Shengheng work, publishing house of Hunan University, " quartz oscillator "; Fig. 2 comes from volume the 5th phase supplementary issue " novel computer compensation crystal oscillator " in " Chinese journal of scientific instrument " October the 23rd in 2002).When high frequency overtone crystal oscillator is compensated because narrower (the Δ f/n of connection in series-parallel frequency interval 2) and need the method for coilloading to expand the connection in series-parallel frequency, perhaps adopt methods such as frequency multiplication, so just caused the frequency stability index to reduce, make an uproar mutually big.And current electronic technology demand for development reduces volume, reduces power consumption, reduces the frequency multiplication number of times, has brought the trend of high frequency development; Existing compensation method can not adapt to the needs of high frequency development trend.
It is F that quartz oscillator produces frequency 1The signal of=F+ Δ f (T), wherein, frequency F 1Be not compensate and the frequency of needs compensation, F is the stable frequency values that expectation obtains, and Δ f (T) is the deviation frequency that is caused by variations in temperature.Test the frequency values that can measure under the different temperatures by doing frequency temperature, utilize the method for curve fit to obtain Δ f (T) then, it is a function, and its variable is a temperature T; The method of the concrete Δ f (T) of generation function is seen document: roll up " Chinese journal of scientific instrument " October the 23rd in 2002 such as the 5th phase supplementary issue " novel computer compensation crystal oscillator ", author's bang rosy clouds etc.
Summary of the invention
The invention provides a kind of quartz oscillator temperature compensation, this method has the low characteristics of making an uproar mutually to the result of quartz oscillator compensation, can carry out the effective temperature compensation to high frequency overtone quartz oscillator.
The invention provides a kind of quartz oscillator temperature compensation, it is characterized in that the following step of its employing realizes:
Step 1: producing frequency by quartz oscillator is F 1The pure oscillation signal of=F+ Δ f (T), wherein, frequency F 1Be not compensate and need the frequency of compensation, F is the stabilized frequency of expectation quartz oscillator output, and Δ f (T) is the frequency shift (FS) that is caused by variations in temperature, and it is a function, varies with temperature and changes;
Step 2: determine Δ f (T) function.By temperature experiment, obtain the frequency-temperature characteristics of the quartz crystal of not compensated, obtain Δ f (T) function through curve fit;
Step 3: obtain current temperature value T by temperature sensor 1
Step 4: is T by step 2 and step 3 gained result through the Current Temperatures that calculates 1The time deviation frequency value Δ f (T 1); Can obtain Current Temperatures thus is T 1The time the compensating frequency value :-Δ f (T 1); Producing frequency by compensating frequency generation circuit is F 2=-Δ f (T 1) the compensating frequency signal;
Step 5: the frequency that step 4 is obtained is F 2Signal be input in the whole wave circuit and obtain being suitable for F 1The sine wave signal of mixing, the constant F that is still of its frequency 2
Step 6: with the frequency of step 1 gained is F 1Sine wave and the frequency of step 5 gained be F 2Sine wave be input to mixing in the frequency mixer simultaneously, the frequency mixer output packet contains frequency and is respectively F 3And F 4Sine wave;
F wherein 3Be frequency F 1With frequency F 2And frequently, its calculation expression is:
F 3=F 1+ F 2=F+ Δ f (T 1)-Δ f (T 1)=F, F promptly are the compensating frequencies that last expectation obtains;
F 4Be frequency F 1With frequency F 2Difference frequency, its calculation expression is:
F 4＝F 1-F 2＝F+Δf(T 1)-[-Δf(T 1)]＝F+2Δf(T 1)；
Step 7: the frequency that includes by step 6 gained is F 3And F 4Signal be input in the filter, this filter is a band pass filter, it can rejection frequency be F 4And the pairing signal of other unwanted sideband frequencies, get the F of the compensating frequency signal that expectation to the end obtains;
Step 8: the frequency that repeating step 3～7 just can obtain obtaining under another temperature to compensate is the signal of F, and the rest may be inferred, just can realize the real-time temperature compensation to the high frequency quartz oscillator.
According to the hardware model that the inventive method is formed, as shown in Figure 3, it comprises: quartz oscillator, frequency mixer, temperature sensor, compensating frequency generation circuit, whole wave circuit, filter.Quartz oscillator is a kind of quartz crystal piezoelectric effect frequency stabilization that utilizes, and produces the device of fixed frequency; Frequency mixer be finish two or more frequencies with frequently with the device of difference frequency; Temperature sensor is that current temperature value is converted into the device that can measure the signal of telecommunication; Compensating frequency generation circuit is the device that produces compensating frequency; Whole wave circuit is that square wave is become sinusoidal wave circuit; Filter is to be used for the circuit of filtering interfering sideband frequency.Their connected mode is as follows: the output of quartz oscillator is connected with an input of frequency mixer; The output of temperature sensor is connected with the input of compensating frequency generation circuit; The output of compensating frequency generation circuit is connected with the input of whole wave circuit; The output of whole wave circuit is connected with the another one input of frequency mixer; The output of frequency mixer is connected with the input of filter; The desired frequency that obtains of filter output.
Essence of the present invention is: produce an opposite compensating frequency signal of deviation frequency absolute value equal symbol that produces with quartz oscillator by temperature sensor and compensating frequency generation circuit, the signal behind the whole ripple of the whole wave circuit of this compensating frequency signal process and the not compensating frequency signal mixing output of quartz oscillator output, the signal that compensates the back frequency through obtaining behind the filter filtering expecting obtaining again, thus reach the purpose of temperature-compensating.
At present domestic and international used temperature compensation all is the information generation bucking voltages by temperature sensor, come the variable capacitance diode in the control generator, the control frequency or produce compensated information by temperature sensor by changing electric capacity is adjusted frequency thereby control switch electric capacity battle array changes electric capacity.The present invention compares with existing temperature compensation, has the following advantages:
Overcome high frequency overtone crystal oscillator because the too narrow inherent shortcoming of bringing in connection in series-parallel interval of overtone crystal is achieved the temperature-compensating of high frequency overtone crystal oscillator; Overcome the phase jitter that certainly exists in the use of varactor and switching capacity battle array; This method is suitable integrated equally simultaneously.Can adapt to compensation of high frequency overtone and the low active demand of making an uproar mutually and compensating that electronic system requires.
Description of drawings
Fig. 1 is existing analog compensation mode schematic diagram
Wherein, compensating network is made up of elements such as thermistor and variable capacitance diodes; R1, R2 are resistance; CRYSTAL is a quartz crystal; DIONDE VARACTOR is a variable capacitance diode; Oscillator is to produce to need compensation and the circuit of uncompensated frequency;
Fig. 2 is existing digital compensation mode schematic diagram
Wherein, temperature sensor is the device that Current Temperatures is transformed into the signal of telecommunication that can survey; Microprocessor can be devices such as single-chip microcomputer, DSP; Compensating circuit mainly is to control variable capacitance diode with the square wave of microprocessor output to come the output frequency of control oscillation circuit; Oscillating circuit is to produce to need compensation and the circuit of uncompensated frequency;
Fig. 3 is a theory diagram of the present invention
Wherein, quartz oscillator is a kind of quartz crystal piezoelectric effect frequency stabilization that utilizes, and produces the device of fixed frequency; Frequency mixer be finish two or more frequencies with frequently with the circuit of difference frequency; Temperature sensor is that current temperature value is converted into the device that can measure the signal of telecommunication; Compensating frequency generation circuit is the device that produces compensating frequency; Whole wave circuit is that square wave is become sinusoidal wave circuit; Filter is to be used for the circuit of filtering interfering sideband frequency;
Fig. 4 is a specific embodiment of the invention circuit theory diagrams
R1, R2, R3 are resistance, and span is: 2K～5K Ω;
R4 is a resistance, and its span is: 200～400 Ω;
NPN is a triode;
TRANS3 is a transformer, and its no-load voltage ratio all is 1: 1;
C1 is an electric capacity, and its value is: 0.11 μ F;
C3 is an electric capacity, and its value is: 15F;
C4 is an electric capacity, and its value is: 30pF;
C5, C6 are electric capacity, and its value is: 20pF;
INDUCTOR1, INDUCTOR2, INDUCTOR3 are inductance, and its span is: 5～10mH; C7, C8, C9 are electric capacity, and its span is: 200～400pF;
DIODE is a diode;
AD μ 814 is microprocessors, and it has temperature sensor;
Also have in addition+the 5V power supply, two natural frequencys all are 5 overtone quartz crystals of 100MHz.
Embodiment
The method according to this invention, we form a kind of 100MHz, 5 overtone temperature compensating crystal oscillators, and its schematic diagram is as shown in Figure 4.
In Fig. 4,
By R1, R2, R3, R4, C1, C2, C3, C4, NPN triode, natural frequency be 100MHz 5 overtone quartz crystals ,+devices such as 5V power supply have constituted quartz oscillator;
Constituted frequency mixer by two diode DIODE, two devices such as transformer TRANS3;
By C5, C6, natural frequency is that 5 devices such as overtone quartz crystal of 100MHz have constituted filter;
Constituted whole wave circuit by devices such as C7, C8, C9, INDUCTOR1, INDUCTOR2, INDUCTOR3;
Constituted compensating frequency generation circuit by AD μ 814; Wherein, AD μ 814 is microprocessors, and it has temperature sensor, can produce a compensating frequency signal by the method for software programming.
The element span is:
Resistance:
R1、R2、R3：2K～5KΩ；R4：200～400Ω
Electric capacity:
C1：0.11μF；C3：15pF；C4：30pF；C5、C6：20pF；C7、C8、C9：200～400pF
Inductance:
INDUCTOR1、INDUCTOR2、INDUCTOR3：5～10mH。

Claims (1)

  1. Step 1: producing frequency by quartz oscillator is F 1The pure oscillation signal of=F+ Δ f (T), wherein, frequency F 1Be not compensate and need the frequency of compensation, F is the stabilized frequency of expectation quartz oscillator output, and Δ f (T) is the frequency shift (FS) that is caused by variations in temperature, and it is a function, varies with temperature and changes;
    Step 2: determine Δ f (T) function; By temperature experiment, obtain the frequency-temperature characteristics of the quartz crystal of not compensated, obtain Δ f (T) function through curve fit;
    Step 3: obtain current temperature value T by temperature sensor 1
    Step 4: is T by step 2 and step 3 gained result through the Current Temperatures that calculates 1The time deviation frequency value Δ f (T 1); Can obtain Current Temperatures thus is T 1The time the compensating frequency value :-Δ f (T 1); Producing frequency by compensating frequency generation circuit is F 2=-Δ f (T 1) the compensating frequency signal;
    Step 5: the frequency that step 4 is obtained is F 2Signal be input to the sine wave signal that obtains in the whole wave circuit being suitable for the F1 mixing, the constant F that is still of its frequency 2
    Step 6: with the frequency of step 1 gained is F 1Sine wave and the frequency of step 5 gained be F 2Sine wave be input to mixing in the frequency mixer simultaneously, the frequency mixer output packet contains frequency and is respectively F 3And F 4Sine wave;
    F wherein 3Be frequency F 1With frequency F 2And frequently, its calculation expression is:
    F 3=F 1+ F 2=F+ Δ f (T 1)-Δ f (T 1)=F, F promptly are the compensating frequencies that last expectation obtains;
    F 4Be frequency F 1With frequency F 2Difference frequency, its calculation expression is:
    F 4＝F 1-F 2＝F+Δf(T 1)-[-Δf(T 1)]＝F+2Δf(T 1)；
    Step 7: the frequency that includes by step 6 gained is F 3And F 4Signal be input in the filter, this filter is a band pass filter, it can rejection frequency be F 4And the pairing signal of other unwanted sideband frequencies, get the F of the compensating frequency signal that expectation to the end obtains;
    Step 8: the frequency that repeating step 3～7 just can obtain obtaining under another temperature to compensate is the signal of F, and the rest may be inferred, just can realize the real-time temperature compensation to the high frequency quartz oscillator.
CNB2004100226803A 2004-06-03 2004-06-03 Temperature-compensating method for quartz crystal oscillator Expired - Fee Related CN100471035C (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101826850A (en) * 2010-03-19 2010-09-08 北京天碁科技有限公司 Method for controlling working frequency of quartz crystal and reference clock based on quartz crystal
CN101958726A (en) * 2009-07-13 2011-01-26 厦门胜华通信技术有限公司 Method and device for eliminating frequency deviation through temperature compensation in WCDMA (Wideband Code Division Multiple Access) frequency selector
CN102082549A (en) * 2010-12-22 2011-06-01 广东大普通信技术有限公司 Voltage control crystal oscillator
CN102931916A (en) * 2012-11-15 2013-02-13 清华大学 Analog-digital mixed temperature compensation crystal oscillating circuit
CN103716042A (en) * 2013-12-26 2014-04-09 北京无线电计量测试研究所 Temperature compensation method used for simulating temperature compensated crystal oscillator
CN103905000A (en) * 2012-12-28 2014-07-02 联芯科技有限公司 Method for adjusting frequency and terminal device
CN105136335A (en) * 2015-08-20 2015-12-09 山西大学 Polymer glass transition temperature measuring device and method based on tuning fork quartz crystal oscillator
CN105201803A (en) * 2015-09-02 2015-12-30 宁波摩米创新工场电子科技有限公司 Automatic constant temperature control system based on frequency stabilization circuit and applied to a circulating water pump
CN107465393A (en) * 2017-07-05 2017-12-12 广州昂宝电子有限公司 Frequency compensated system and method for Real Time Clock System
WO2021057525A1 (en) * 2019-09-23 2021-04-01 中兴通讯股份有限公司 Resonance circuit, frequency offset control method, communication device and storage medium
CN113872527A (en) * 2021-09-26 2021-12-31 北京晨晶电子有限公司 Overtone temperature compensation crystal oscillator and electronic equipment

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CN102545778B (en) * 2010-12-30 2014-08-13 苏州银河龙芯科技有限公司 Closed-loop temperature compensation method and device for clock crystal oscillator
WO2018072195A1 (en) 2016-10-21 2018-04-26 华为技术有限公司 Method and device for sampling and compensating blood pressure detection signal and blood pressure signal acquisition system

Cited By (19)

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Publication number Priority date Publication date Assignee Title
CN101958726A (en) * 2009-07-13 2011-01-26 厦门胜华通信技术有限公司 Method and device for eliminating frequency deviation through temperature compensation in WCDMA (Wideband Code Division Multiple Access) frequency selector
CN101958726B (en) * 2009-07-13 2013-06-05 厦门胜华通信技术有限公司 Method and device for eliminating frequency deviation through temperature compensation in WCDMA (Wideband Code Division Multiple Access) frequency selector
CN101826850A (en) * 2010-03-19 2010-09-08 北京天碁科技有限公司 Method for controlling working frequency of quartz crystal and reference clock based on quartz crystal
CN102082549A (en) * 2010-12-22 2011-06-01 广东大普通信技术有限公司 Voltage control crystal oscillator
CN102931916A (en) * 2012-11-15 2013-02-13 清华大学 Analog-digital mixed temperature compensation crystal oscillating circuit
CN103905000A (en) * 2012-12-28 2014-07-02 联芯科技有限公司 Method for adjusting frequency and terminal device
CN103905000B (en) * 2012-12-28 2017-07-11 联芯科技有限公司 The method and terminal device of frequency adjustment
CN103716042B (en) * 2013-12-26 2016-09-21 北京无线电计量测试研究所 A kind of temperature compensation for crystal oscillator of analog temperature compensation
CN103716042A (en) * 2013-12-26 2014-04-09 北京无线电计量测试研究所 Temperature compensation method used for simulating temperature compensated crystal oscillator
CN105136335B (en) * 2015-08-20 2017-09-26 山西大学 The measurement apparatus and method of polymer glass conversion temperature based on tuning-fork type quartz crystal oscillator
CN105136335A (en) * 2015-08-20 2015-12-09 山西大学 Polymer glass transition temperature measuring device and method based on tuning fork quartz crystal oscillator
CN105201803B (en) * 2015-09-02 2017-03-29 宁波摩米创新工场电子科技有限公司 Water circulating pump constant-temperature automatic control system based on frequency stabilization oscillating circuit
CN105201803A (en) * 2015-09-02 2015-12-30 宁波摩米创新工场电子科技有限公司 Automatic constant temperature control system based on frequency stabilization circuit and applied to a circulating water pump
CN107465393A (en) * 2017-07-05 2017-12-12 广州昂宝电子有限公司 Frequency compensated system and method for Real Time Clock System
US10734947B2 (en) 2017-07-05 2020-08-04 Guangzhou On-Bright Electronics Co., Ltd. Systems and methods for frequency compensation of real-time-clock systems
US11012032B2 (en) 2017-07-05 2021-05-18 Guangzhou On-Bright Electronics Co., Ltd. Systems and methods for frequency compensation of real-time-clock systems
WO2021057525A1 (en) * 2019-09-23 2021-04-01 中兴通讯股份有限公司 Resonance circuit, frequency offset control method, communication device and storage medium
CN113872527A (en) * 2021-09-26 2021-12-31 北京晨晶电子有限公司 Overtone temperature compensation crystal oscillator and electronic equipment
CN113872527B (en) * 2021-09-26 2022-07-08 北京晨晶电子有限公司 Overtone temperature compensation crystal oscillator and electronic equipment

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