CN202231673U - High-precision temperature compensated crystal oscillator - Google Patents
High-precision temperature compensated crystal oscillator Download PDFInfo
- Publication number
- CN202231673U CN202231673U CN2011203961750U CN201120396175U CN202231673U CN 202231673 U CN202231673 U CN 202231673U CN 2011203961750 U CN2011203961750 U CN 2011203961750U CN 201120396175 U CN201120396175 U CN 201120396175U CN 202231673 U CN202231673 U CN 202231673U
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- Prior art keywords
- converter
- crystal oscillator
- electrically connected
- microprocessor
- controlled oscillator
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- Expired - Fee Related
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Abstract
The utility model relates to a high-precision temperature compensated crystal oscillator, comprising a crystal oscillator, a temperature sensor, an A/D (Analogue-to-Digital) converter, a microprocessor and a D/A (Digital-to-Analogue) converter, wherein the crystal oscillator is a voltage-controlled oscillator; the temperature sensor is arranged beside the voltage-controlled oscillator; the signal output end of the temperature sensor is electrically connected with the input end of the A/D converter; the output end of the A/D converter is electrically connected with the signal input end of the microprocessor; the signal output end of the microprocessor is electrically connected with the input end of the D/A converter; and the output end of the D/A converter is electrically connected with the voltage-controlled oscillator. The high-precision temperature compensated crystal oscillator has the advantages of small size and high temperature stability in a wide temperature range.
Description
Technical field
The utility model relates to a kind of crystal oscillator that communication equipment, navigation, tester etc. are military, reach consumer consumer electronic product that is applied to, and relates in particular to a kind of high accuracy compensation crystal oscillator of digital compensation.
Background technology
At present, the crystal oscillator of digital compensation has higher frequency stability, and application prospect is better.But, make its application receive bigger restriction because its volume is big, cost is too high.And the like product on the market, its stability is ± 5 * 10
-7, stability is general.
The utility model content
For solving the problems of the technologies described above, the utility model provides a kind of volume little, the high accuracy compensation crystal oscillator that temperature stability is high in wide temperature range.
A kind of high accuracy compensation crystal oscillator of the utility model; Its innovative point is: comprise crystal oscillator, temperature sensor, A/D converter, microprocessor and D/A converter; Said crystal oscillator is a voltage controlled oscillator; Said temperature sensor is arranged on by the voltage controlled oscillator, and the signal output part of said temperature sensor is electrically connected with the input of A/D converter, and the output of said A/D converter is electrically connected with the signal input part of microprocessor; The signal output part of microprocessor is electrically connected with the input of D/A converter, and the output of said D/A converter is electrically connected with voltage controlled oscillator.
Said voltage controlled oscillator is a variable capacitance diode.
Compared with prior art the beneficial effect of the utility model is: temperature sensor is measured the temperature T of crystal resonator; Convert the digital quantity NT that represents this temperature into through A/D; Use NT as the address again; Deliver to D/A converter after from data segment, reading the function of temperature compensation control voltage data Nk that stores this address by microprocessor, change corresponding analog temperature compensation control voltage U K into by D/A converter again and be added to the variable capacitance diode two ends of voltage controlled oscillator.The utility model volume is little, and is low in energy consumption, and in wide temperature range, temperature stability is high.Volume is 20mm * 12mm * 9mm; Power consumption is not more than 50mW.In-40 ℃～+ 85 ℃ temperature ranges, stability is superior to ± and 2 * 10
-7
Description of drawings
Fig. 1 is the structural representation of the utility model.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the embodiment of the utility model is described in further detail.Following examples are used to explain the utility model, but are not used for limiting the scope of the utility model.
As shown in Figure 1; A kind of high accuracy compensation crystal oscillator; Comprise crystal oscillator, temperature sensor 1, A/D converter 2, microprocessor 3 and D/A converter 4, said crystal oscillator is voltage controlled oscillator vctcxo, and said temperature sensor 1 is arranged on by the voltage controlled oscillator vctcxo; The signal output part of said temperature sensor 1 is electrically connected with the input of A/D converter 2; The output of said A/D converter 2 is electrically connected with the signal input part of microprocessor 3, and the signal output part of microprocessor 3 is electrically connected with the input of D/A converter 4, and the output of said D/A converter 4 is electrically connected with voltage controlled oscillator vctcxo.
Said voltage controlled oscillator vctcxo is a variable capacitance diode.
Needed temperature compensation data obtains and writes in the data segment of microprocessor 3 by experiment when on each different temperature points, keeping frequency of oscillation to be nominal frequency f0. and temperature sensor 1 is measured the temperature T of crystal oscillator; Convert the digital quantity NT that represents this temperature into through A/D; Use NT as the address again; Deliver to D/A converter after from data segment, reading the function of temperature compensation control voltage data Nk that stores this address by microprocessor; Change corresponding analog temperature compensation control voltage U K into by D/A converter again and be added to the variable capacitance diode two ends of voltage controlled oscillator VCTCXO, level off to nominal frequency f0 by assigned error with control VCTCXO frequency of oscillation.
The above only is the preferred implementation of the utility model; Should be understood that; For those skilled in the art; Under the prerequisite that does not break away from the utility model know-why, can also make some improvement and modification, these improvement and modification also should be regarded as the protection range of the utility model.
Claims (2)
1. high accuracy compensation crystal oscillator; It is characterized in that: comprise crystal oscillator, temperature sensor (1), A/D converter (2), microprocessor (3) and D/A converter (4); Said crystal oscillator is voltage controlled oscillator (vctcxo); It is other that said temperature sensor (1) is arranged on voltage controlled oscillator (vctcxo); The signal output part of said temperature sensor (1) is electrically connected with the input of A/D converter (2); The output of said A/D converter (2) is electrically connected with the signal input part of microprocessor (3), and the signal output part of microprocessor (3) is electrically connected with the input of D/A converter (4), and the output of said D/A converter (4) is electrically connected with voltage controlled oscillator (vctcxo).
2. high accuracy compensation crystal oscillator according to claim 1 is characterized in that: said voltage controlled oscillator (vctcxo) is a variable capacitance diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203961750U CN202231673U (en) | 2011-10-18 | 2011-10-18 | High-precision temperature compensated crystal oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203961750U CN202231673U (en) | 2011-10-18 | 2011-10-18 | High-precision temperature compensated crystal oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202231673U true CN202231673U (en) | 2012-05-23 |
Family
ID=46082245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203961750U Expired - Fee Related CN202231673U (en) | 2011-10-18 | 2011-10-18 | High-precision temperature compensated crystal oscillator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202231673U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931916A (en) * | 2012-11-15 | 2013-02-13 | 清华大学 | Analog-digital mixed temperature compensation crystal oscillating circuit |
| 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 |
-
2011
- 2011-10-18 CN CN2011203961750U patent/CN202231673U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931916A (en) * | 2012-11-15 | 2013-02-13 | 清华大学 | Analog-digital mixed temperature compensation crystal oscillating circuit |
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Beijing Crystal Electronics Co., Ltd. Document name: Notification to Pay the Fees |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120523 Termination date: 20141018 |
|
| EXPY | Termination of patent right or utility model |