CN201294485Y - High-reliability crystal oscillator circuit - Google Patents
High-reliability crystal oscillator circuit Download PDFInfo
- Publication number
- CN201294485Y CN201294485Y CNU200820218859XU CN200820218859U CN201294485Y CN 201294485 Y CN201294485 Y CN 201294485Y CN U200820218859X U CNU200820218859X U CN U200820218859XU CN 200820218859 U CN200820218859 U CN 200820218859U CN 201294485 Y CN201294485 Y CN 201294485Y
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- Prior art keywords
- crystal oscillator
- reliability
- circuit
- oscillation
- improved
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 239000013078 crystal Substances 0.000 title claims abstract description 50
- 239000003990 capacitor Substances 0.000 claims abstract description 7
- 230000010355 oscillation Effects 0.000 abstract description 14
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000003292 diminished effect Effects 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Abstract
The utility model discloses a crystal oscillator circuit that reliability is high has crystal oscillator component and drive circuit, the input of crystal oscillator component, output meet with electric capacity C1, C2 respectively, electric capacity C1, C2's other end ground connection. The structure is simple, two capacitors are connected in parallel at two ends of the crystal oscillator element, so that the equivalent impedance of a crystal oscillator loop is reduced, the oscillation starting condition of the crystal oscillator is reduced, and the oscillation starting reliability is improved; on the other hand, under the condition that the driving capacity of the driving circuit is fixed, the margin between the maximum crystal oscillator load and the driven impedance is increased, the stability of oscillation is improved, and the stable vibration of the crystal oscillator under severe environmental conditions can be fully ensured; the reliability of the whole crystal oscillator circuit is improved.
Description
Technical field:
The utility model relates to a kind of crystal oscillating circuit, especially a kind of simple in structure, crystal oscillating circuit with high reliability.
Background technology:
At present, crystal oscillating circuit (crystal oscillating circuit) has been widely used in colour TV, computer, remote controller and the communication equipment, provides reference signal for the data processing equipment clocking and for particular system.Existing crystal oscillating circuit kind is a lot, common crystal oscillating circuit, voltage type crystal oscillating circuit, temp. compensation type crystal oscillating circuit, thermostatic control formula crystal oscillation and digit compensated crystal oscillating circuit etc. are arranged, but substantially all be to constitute by crystal oscillator element (quartz oscillator etc.) and drive circuit.When drive circuit when crystal oscillator element output meets the drive signal of starting of oscillation requirement, the crystal oscillator element will vibrate, the impedance of promptly supposing the crystal oscillator element is R1, and the maximum crystal oscillator load that drive circuit can drive is R2, the crystal oscillator element can starting of oscillation condition at least be exactly R2 〉=R1, otherwise the crystal oscillator element just can not starting of oscillation.But this basic condition can only guarantee that the crystal oscillator element in theory can starting of oscillation, can not fully guarantee the stability of vibrating.A large amount of test shows, having only poor (surplus) between maximum crystal oscillator load R2 and the driving impedance R1 of institute is under 3～5 times the situation of the driving impedance R1 of institute, can fully guarantee the vibration that crystal oscillator also can be stable under harsh environmental conditions.Yet, be subjected to the restriction of existing drive circuit driving force, make that the reliability of existing crystal oscillating circuit starting of oscillation and stable oscillation stationary vibration is all lower.
Summary of the invention:
The utility model is in order to solve existing in prior technology starting of oscillation and the lower technical problem of stable oscillation stationary vibration reliability, and a kind of simple in structure, crystal oscillating circuit that reliability is high is provided.
Technical solution of the present utility model is: the crystal oscillating circuit that a kind of reliability is high, crystal oscillator element and drive circuit are arranged, and it is characterized in that: the input of described crystal oscillator element, output join with capacitor C 1, C2 respectively, the other end ground connection of capacitor C 1, C2.
The utility model is simple in structure, in the parallel connection of the two ends of crystal oscillator element two electric capacity, the equiva lent impedance in crystal oscillator loop is diminished, reduced the starting condition for oscillation of crystal oscillator, improved the reliability of starting of oscillation; On the other hand, under the certain situation of drive circuit driving force, increase the surplus between maximum crystal oscillator load and the institute's driving impedance, improved the stability of vibration, can fully guarantee the vibration that crystal oscillator also can be stable under harsh environmental conditions; The reliability of whole crystal oscillating circuit is improved.
Description of drawings:
Fig. 1 is the circuit theory diagrams of the utility model embodiment.
Embodiment:
Below in conjunction with description of drawings embodiment of the present utility model.As shown in Figure 1: the same with prior art, the crystal oscillator element is arranged, as quartz oscillator etc., also have the drive circuit that joins with the crystal oscillator element, as existing large scale integrated circuit.Difference from prior art is join respectively capacitor C 1, C2 of input, the output with the crystal oscillator element, the other end ground connection of capacitor C 1, C2, promptly in the parallel connection of the two ends of crystal oscillator element two electric capacity, the equiva lent impedance in crystal oscillator loop is diminished.
Claims (1)
1. the crystal oscillating circuit that reliability is high has crystal oscillator element and drive circuit, it is characterized in that: the input of described crystal oscillator element, output join with capacitor C 1, C2 respectively, the other end ground connection of capacitor C 1, C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820218859XU CN201294485Y (en) | 2008-11-03 | 2008-11-03 | High-reliability crystal oscillator circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820218859XU CN201294485Y (en) | 2008-11-03 | 2008-11-03 | High-reliability crystal oscillator circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201294485Y true CN201294485Y (en) | 2009-08-19 |
Family
ID=41007965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820218859XU Expired - Fee Related CN201294485Y (en) | 2008-11-03 | 2008-11-03 | High-reliability crystal oscillator circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201294485Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102231060A (en) * | 2011-07-18 | 2011-11-02 | 北京航天福道高技术股份有限公司 | General-purpose hardware platform device |
| CN102684601A (en) * | 2012-05-18 | 2012-09-19 | 苏州慧飞信息科技有限公司 | Crystal oscillating circuit |
-
2008
- 2008-11-03 CN CNU200820218859XU patent/CN201294485Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102231060A (en) * | 2011-07-18 | 2011-11-02 | 北京航天福道高技术股份有限公司 | General-purpose hardware platform device |
| CN102684601A (en) * | 2012-05-18 | 2012-09-19 | 苏州慧飞信息科技有限公司 | Crystal oscillating circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090819 Termination date: 20151103 |
|
| EXPY | Termination of patent right or utility model |