CN1411288A - Intercom crystal oscillator digital temperature compensating method and its system - Google Patents
Intercom crystal oscillator digital temperature compensating method and its system Download PDFInfo
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- CN1411288A CN1411288A CN 01129748 CN01129748A CN1411288A CN 1411288 A CN1411288 A CN 1411288A CN 01129748 CN01129748 CN 01129748 CN 01129748 A CN01129748 A CN 01129748A CN 1411288 A CN1411288 A CN 1411288A
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Abstract
A compensation method and system for interphone crystal oscillator digital temperature is that based on including microcontroller, memory and crystal oscillator system, this invention applies the following steps: a sending temperature value of a crystal oscillator detected by the temperature detecting circuit to A/D converter to be transferred to digital quantity b. the microcontroller of an interphone takes the digital quantity as the address to fetch the corresponding compensation voltage data of the crystal from the memory to be converted to analog voltage by D/A converter to input it into DV1 of the crystal oscillator to further adjust the frequency of the crystal oscillator, which shares microprocessor, memory, A/D with interphone and fully uses the hardware resources in interphone.
Description
Technical field
The present invention relates to the technique for temperature compensation of radio communication device with crystal oscillator, specifically is a kind of crystal oscillator digital temperature compensating method and system thereof of intercom.
Background technology
Owing to be becoming tight frequency resource day, so also more and more higher to the requirement of communication apparatus frequency stabilities such as intercom, general requirement is lower than 2.5PPm.Radio communication device can be divided into direct-type and indirect type two classes with the crystal oscillator frequency temperature-compensating, but all is to realize by the load capacitance that changes crystal.Direct-type is commonly referred to analog (TCXO), and at present, most commercially available temperature-compensating crystal oscillator is direct type.
In non-direct type temperature compensating crystal oscillator, temperature sensing circuit separates with oscillating circuit, changes frequency of oscillation and realizes that by load capacitance control is normally carried out with digital form.As U.S. Pat 5081431 disclosed digital temperature compensated oscillator (DTCXO) etc., adopt modular construction, little outer reason device, D/A, memory, crystal oscillator, temperature sensor etc. are integrated in the module, advantage is that volume is small and exquisite, precision is higher, applied widely, shortcoming is the cost height, and is on the high side.
Chinese patent 98127182.0 provides a kind of improved digital temperature compensated voltage controlled oscillator (TCO), and it directly transfers to the frequency of selected channel, does not need crystal unit (seeing that the 3rd page of 26-28 of specification is capable), and it also is a kind of independently modular structure.
In a word, commercially available temperature compensated oscillator is made a module more at present, exist as an individual components, usually can do volume small and exquisite (5 * 7mm), precision higher (less than 1PPm), but owing to module is made up of application-specific integrated circuit, crystal and ceramic substrate etc., so cost is higher, price is more expensive, is unfavorable for that users accept.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art, a kind of crystal oscillator digital temperature compensating method and system thereof of intercom are provided, to make full use of the existing resource of intercom, satisfy modern communication product low-voltage, small size, low cost and requirement of mass production.
The crystal oscillator digital temperature compensating method of this intercom based on the system that comprises microcontroller, memory and crystal oscillator, is characterized in that taking following steps:
A, the temperature value of the detected crystal oscillator of temperature sensing circuit sent into the A/D converter be converted to digital quantity,
The microcontroller of b, intercom is the crystal correspondence is taken out in the address from memory bucking voltage data with described digital quantity, is exchanged into aanalogvoltage through the D/A converter, the varactor DVI of input crystal oscillator, and then the frequency of regulating crystal oscillator.
In intercom, realize the crystal oscillator digital temperature compensating system of said method, comprise microcontroller, memory and crystal oscillator, it is characterized in that also comprising: the temperature sensing circuit of crystal oscillator, A/D converter and D/A converter; Described microcontroller, memory are the microcontroller and the memories of intercom, microcontroller takes out corresponding bucking voltage data according to the digital temperature amount that detects from memory, be transformed into aanalogvoltage through the D/A converter, and then regulate the frequency of crystal oscillator.
The present invention takes the crystal oscillator of the phase-locked loop circuit of direct compensation intercom, thereby reaches the stable of frequency.Itself and the shared microprocessor of intercom, memory, A/D etc. have made full use of hardware resource such as microcontroller and memory in the intercom, therefore, can reduce cost greatly, dwindle the volume of complete machine.
It combines the main control part of DTCXO part and intercom, and not only the wasting of resources reduces, and satisfied-25 ℃～+ 50 ℃, warm rate stability less than 2.5PPm index condition under, can produce in enormous quantities.
Description of drawings
Fig. 1 is a system principle diagram of the present invention;
Fig. 2 is the temperature frequency characteristic of AT cut type crystal;
Fig. 3 is a temperature frequency normalization characteristic curve;
Fig. 4 is a temperature frequency compensation characteristic curve;
Fig. 5 is the relation curve of voltage and frequency difference;
Fig. 6 is bucking voltage and temperature relation curve.
Embodiment
As shown in Figure 1, the crystal oscillator digital temperature compensating system of intercom, comprise: microcontroller (104), memory (103) and crystal oscillator (101), the temperature sensing circuit of crystal oscillator (102), A/D converter and D/A converter (105); Microcontroller takes out corresponding bucking voltage data according to the digital temperature amount that detects from memory, be transformed into aanalogvoltage through the D/A converter, and then regulates the frequency of crystal oscillator.
During work, under the control of program, microcontroller (104) is according to the detected ambient temperature value of temperature sensing circuit (102), from memory (103), take out corresponding bucking voltage data, be transformed into control voltage through D/A (105), be added to the varactor DVI of crystal oscillator by resistance R 1, make oscillator (101) frequency keep stable.Therefore, just can realize compensating as long as in memory, deposit in advance to the corresponding bucking voltage data of compensated crystal temperature frequency difference.
Wherein, generally also need microcontroller and memory in the intercom, therefore, need not increases microcontroller and memory in addition for the temperature-compensating of crystal oscillator, and, the microcontroller of now a lot of models all is built-in with the A/D converter, can adopt the microcontroller of built-in A/D converter in the specific embodiment.The D/A converter can adopt integrated chip, and the present invention adopts the R-2R resistor network to form because the varactor defeated people that is high impedance, so the output of R-2R network can be directly tuning voltage by way of compensation, need not to connect amplifier output.As for crystal oscillator, can directly form oscillator by crystal and Phase Lock Loop IC internal circuit.In sum since with the intercom common parts, can save cost greatly.
Another outstanding feature of the present invention is exactly the production method of bucking voltage data, and the offset data of general digital temperature compensation crystal oscillistor needs to scan and write down the characteristic of the crystal oscillator in the whole temperature range, thereby produces the corresponding compensation data.Its advantage is that the offset data of each temperature spot is accurate, the output frequency stability height of crystal oscillator, and its shortcoming is to need expensive crystal checker device and relative many testing times.
The present invention is according to AT cut type crystal property, by professional crystal production producer provide-30 ℃ ,-20 ℃ ,+15 ℃ ,+40 ℃ ,+60 ℃ five temperature spot frequency difference values, calculate bucking voltage numerical value.Its advantage is the investment of exempting the crystal checker device of costliness, the test of crystal temperature effect point is finished by professional crystal production producer, usually crystal producer all has crystal checker device preferably, and probe temperature point only needs five, therefore the testing time is short relatively, its weak point is that precision is poor slightly, but is absolute no problem for the standard less than the 2.5PPm frequency stability.
The production method of bucking voltage data is specific as follows:
AT cut type crystal has temperature frequency characteristic as shown in Figure 2, because the variation of cutting angle, each crystal is all inequality in the frequency difference of each temperature spot, but can both use formula (1) to describe, and just each ordered coefficients is different.
Δf/f＝a
0(T-T
0)
4+b
0(T-T
0)
3+c
0(T-T
0)
2+d
0(T-T
0)+e
0 (1)
In the formula: T:(-30 ℃～+ 60 ℃) the arbitrary temp point
T
0: 25 ℃ of reference temperatures
For specific crystal, use that manufacturer provides-20 ℃ ,+15 ℃ ,+40 ℃ ,+60 ℃ five temperature spot frequency difference values, use matrix equation to obtain the coefficient a of this crystal
0～e
0Value, calculate the frequency difference there emerged a the temperature spot correspondence with formula then, as shown in Figure 3 the normalization of drawing (get 25 ℃ of values for reference to null value) curve.Get its anti-value (the frequency difference offset that need provide), as Fig. 4 for frequency difference is equalled zero.Utilize the bucking voltage and the relation formula (2) that compensates frequency difference, Vc=0.0001 (Δ f/f+7) that have recorded again
3+ 0.0006 (Δ f/f+7)
2+ 0.1411 (Δ f/f+7)+0.6061 (2) curve such as Fig. 5 just can calculate the bucking voltage value, as Fig. 6 bucking voltage and temperature relation curve, deposits its quantification in E
2Just finished the compensation work of this crystal among the PROM (103).
More than the process of calculating bucking voltage has been weaved into microcomputer software, during work,, the temperature frequency difference value of corresponding five points of crystal is imported in the microcomputer with keyboard according to the crystal numbering of producer, just can form the offset data of this crystal correspondence, write the E that the people is equipped with the intercom of this crystal by interface then
2Among the PROM (103), just finished compensation work.
Claims (6)
1, a kind of crystal oscillator digital temperature compensating method of intercom based on the system that comprises microcontroller and memory, is characterized in that taking following steps:
A, the temperature value of the detected crystal oscillator of temperature sensing circuit sent into the A/D converter be converted to digital quantity,
The microcontroller of b, intercom is the crystal correspondence is taken out in the address from memory bucking voltage data with described digital quantity, is exchanged into aanalogvoltage through the D/A converter, the varactor DVI of input crystal oscillator and then the frequency of regulating crystal oscillator.
2, according to the crystal oscillator digital temperature compensating method of the described intercom of claim 1, it is characterized in that: the resident bucking voltage tables of data that used crystal oscillator is arranged in the memory.
3. according to the crystal oscillator digital temperature compensating method of claim 2 intercom, it is characterized in that: the bucking voltage tables of data of the used crystal oscillator in the described memory, be according to AT cut type crystal property, by-30 ℃ ,-20 ℃ of used crystal ,+15 ℃ ,+40 ℃ ,+60 ℃ five temperature spot frequency difference values calculate.
4, the crystal oscillator digital temperature bucking-out system of intercom comprises microcontroller, memory and crystal oscillating circuit, it is characterized in that also comprising: the temperature sensing circuit of crystal oscillating circuit, A/D converter and D/A converter; Described microcontroller, memory are the microcontroller and the memories of intercom, microcontroller takes out corresponding bucking voltage data according to the digital temperature amount that detects from memory, be exchanged into aanalogvoltage through the D/A converter, and then regulate the frequency of crystal oscillating circuit.
5, according to the crystal oscillator digital temperature bucking-out system of the described intercom of claim 4, it is characterized in that: described A/D converter is the built-in A/D converter of microcontroller.
6, according to the crystal oscillator digital temperature bucking-out system of the described intercom of claim 4, it is characterized in that: described D/A converter using resistor network converter.
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| CN 01129748 CN1411288A (en) | 2001-10-10 | 2001-10-10 | Intercom crystal oscillator digital temperature compensating method and its system |
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Cited By (9)
| 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 |
| CN102006068A (en) * | 2010-11-30 | 2011-04-06 | 江汉大学 | Improved rubidium atom frequency scale |
| CN102122952A (en) * | 2011-03-30 | 2011-07-13 | 苏州麦格芯微电子有限公司 | Digital temperature compensation crystal oscillator |
| CN102519666A (en) * | 2011-12-29 | 2012-06-27 | 中国燃气涡轮研究院 | Digital temperature compensation system and method |
| CN103036505A (en) * | 2012-12-19 | 2013-04-10 | 同方国芯电子股份有限公司 | High-accuracy temperature compensation crystal oscillator system and operational method thereof |
| CN104467674A (en) * | 2014-12-29 | 2015-03-25 | 电子科技大学 | Voltage-controlled temperature compensation crystal oscillator |
| CN105306056A (en) * | 2014-07-28 | 2016-02-03 | 北京自动化控制设备研究所 | Scale factor temperature compensating method of current frequency conversion circuit |
| CN105991128A (en) * | 2015-03-16 | 2016-10-05 | 精工爱普生株式会社 | Oscillator, electronic apparatus, and moving object |
| CN106911352A (en) * | 2017-01-19 | 2017-06-30 | 力同科技股份有限公司 | Oscillator signal generative circuit, digital intercom terminal and production method |
-
2001
- 2001-10-10 CN CN 01129748 patent/CN1411288A/en active Pending
Cited By (12)
| 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 |
| CN102006068A (en) * | 2010-11-30 | 2011-04-06 | 江汉大学 | Improved rubidium atom frequency scale |
| CN102122952A (en) * | 2011-03-30 | 2011-07-13 | 苏州麦格芯微电子有限公司 | Digital temperature compensation crystal oscillator |
| CN102122952B (en) * | 2011-03-30 | 2012-10-24 | 苏州麦格芯微电子有限公司 | Digital temperature compensation crystal oscillator |
| CN102519666A (en) * | 2011-12-29 | 2012-06-27 | 中国燃气涡轮研究院 | Digital temperature compensation system and method |
| CN103036505A (en) * | 2012-12-19 | 2013-04-10 | 同方国芯电子股份有限公司 | High-accuracy temperature compensation crystal oscillator system and operational method thereof |
| CN105306056A (en) * | 2014-07-28 | 2016-02-03 | 北京自动化控制设备研究所 | Scale factor temperature compensating method of current frequency conversion circuit |
| CN105306056B (en) * | 2014-07-28 | 2019-04-23 | 北京自动化控制设备研究所 | A kind of constant multiplier temperature-compensation method of power frequency conversion circuit |
| CN104467674A (en) * | 2014-12-29 | 2015-03-25 | 电子科技大学 | Voltage-controlled temperature compensation crystal oscillator |
| CN104467674B (en) * | 2014-12-29 | 2017-11-21 | 电子科技大学 | A kind of voltage controlled temperature compensated crystal oscillator |
| CN105991128A (en) * | 2015-03-16 | 2016-10-05 | 精工爱普生株式会社 | Oscillator, electronic apparatus, and moving object |
| CN106911352A (en) * | 2017-01-19 | 2017-06-30 | 力同科技股份有限公司 | Oscillator signal generative circuit, digital intercom terminal and production method |
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