CN203896309U - Low-noise crystal oscillator circuit - Google Patents
Low-noise crystal oscillator circuit Download PDFInfo
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- CN203896309U CN203896309U CN201420335909.8U CN201420335909U CN203896309U CN 203896309 U CN203896309 U CN 203896309U CN 201420335909 U CN201420335909 U CN 201420335909U CN 203896309 U CN203896309 U CN 203896309U
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- 239000013078 crystal Substances 0.000 title claims abstract description 40
- 239000003990 capacitor Substances 0.000 claims abstract description 28
- 230000010355 oscillation Effects 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 abstract description 3
- 239000000284 extract Substances 0.000 abstract 1
- 230000003321 amplification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
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Abstract
The utility model discloses a low-noise crystal oscillator circuit, which comprises a crystal resonator Y1, a main oscillation circuit connected with one end of the crystal resonator Y1 and an amplifying circuit connected with the other end of the crystal resonator Y1. The amplifying circuit comprises a triode Q2, a resistor R3, a capacitor C4, a capacitor C6, a capacitor C5 and an inductor L2, wherein a base electrode of the triode Q2 is connected with the crystal resonator Y1, one ends of the resistor R3 and the capacitor C4, which are mutually connected in parallel, are connected with an emitting electrode of the triode Q2, the other ends are grounded, one end of the capacitor C6 is connected with a collector electrode of the triode Q2, the other end of the capacitor C6 outputs oscillation signals, and one ends of the capacitor C5 and the inductor L2, which are mutually connected in parallel, are connected with the collector electrode of the triode Q2, and the other ends are connected to a power supply. Compared with other circuits, the low-noise crystal oscillator circuit disclosed by the utility model extracts signals from the crystal resonator directly, and makes full use of narrow-band filtering characteristics of the resonator, thereby being capable of acquiring extremely low phase noises. Meanwhile, the crystal triode amplifying circuit with a common-emitter structure is adopted, thereby being capable of acquiring harmonic waves conveniently so as to realize low-noise frequency multiplication.
Description
Technical field
The utility model relates to crystal oscillator field, particularly relates to a kind of low noise crystal oscillator circuit.
Background technology
In traditional crystal oscillator circuit, conventional circuit form mainly contains Pierre Si (Pierce) circuit, Cole's pieze (Colpitts) circuit etc., and in these class circuit, crystal resonator is equivalent to inductance.Conventional Butler oscillating circuit and Driscoll circuit etc. in low noise oscillator circuit design, in such circuit form, crystal resonator works in series resonance pattern.In current oscillator product, low-frequency range crystal oscillator generally adopts Colpitts circuit and distortion thereof, at high band, generally adopts series resonant circuit.
In some application scenario, the highly stable frequency signal that needs upper frequency, these signals are produced through frequency multiplication by the low frequency constant-temperature crystal oscillator (as OCXO such as 5MHz, 10MHz) with very high short steady index and long steady index conventionally, and multiple frequency phase noise is pressed 20logN and worsened.Current crystal oscillator can only produce the single frequency that equals resonant frequency conventionally, when needing frequency multiplication, must adopt special frequency multiplier circuit, and such application makes circuit structure become more complicated.
Conventional frequency-doubling method has phase-locked loop, Schottky diode frequency multiplication mode.Frequency multiplication of phase locked loop circuit arrangement is simple, but the components and parts kind needing in circuit is more, and is not easy to realize the low noise of signal.Diode frequency multiplication mode can realize low noise frequency-multiplication, but circuit more complicated, frequency multiplication loss ratio is larger, has larger harmonic component, higher to the requirement of filter and amplifications at different levels.
Utility model content
For above-mentioned problems of the prior art, the utility model provide a kind of reasonable in design, simple in structure, low-frequency range, debugging simple, use flexibly, low noise crystal oscillator circuit that can direct frequency doubling.
To achieve these goals, the technical solution adopted in the utility model is as follows:
A kind of low noise crystal oscillator circuit, comprise crystal resonator Y1, the main vibration circuit being connected with crystal resonator Y1 one end, the amplifying circuit being connected with the crystal resonator Y1 other end, wherein, amplifying circuit comprises the triode Q2 that base stage is connected with crystal resonator Y1, rear one end parallel with one another is connected with triode Q2 emitter and resistance R 3 and the capacitor C 4 of other end ground connection, one end is connected with triode Q2 collector electrode and the capacitor C 6 of other end outputting oscillation signal, and rear one end parallel with one another is connected with triode Q2 collector electrode and capacitor C 5 and the inductance L 2 of other end access power supply.
Further, described main vibration circuit comprises the triode Q1 that base stage is connected with crystal resonator Y1, the capacitor C 2 that two ends are connected with emitter with the base stage of triode Q1 respectively, rear one end parallel with one another is connected with triode Q1 emitter and resistance R 2 and the capacitor C 3 of other end ground connection, one end is connected with triode Q1 base stage and the inductance L 1 of other end ground connection, and the resistance R 1 and the capacitor C 1 that are all connected with triode Q1 collector electrode, wherein, capacitor C 1 ground connection, resistance R 1 access power supply.
Key of the present utility model is, oscillator signal directly takes out from crystal resonator, compares traditional Colpitts circuit and Pierce circuit, can obviously improve signal to noise ratio, effectively reduces the phase noise of output signal.And from common cobasis amplify scheme different be, in the utility model, amplifying stage triode adopts cascode connected mode, by the LC frequency-selective network of collector electrode, can realize easily first-harmonic output or frequency multiplication is exported, when for frequency multiplication, only need increase and amplify one-level filter and amplification in rear class.
Compared with prior art, the utlity model has following beneficial effect:
The utility model is compared with other circuit, signal is directly drawn from crystal resonator, take full advantage of the narrow-band filtering characteristic of resonator, thereby can obtain extremely low phase noise, simultaneously, owing to having adopted the transistor amplifying circuit of common-emitter configuration, can obtain easily harmonic wave to realize low noise frequency-multiplication, there is substantive distinguishing features and progress, and the utility model is simple in structure, reasonable in design, noise is low, debugging is simple, use flexibly, there is market application foreground widely, be applicable to applying, especially in highly stable frequency signal generation field, there is higher application value.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of single-frequency output in prior art.
Fig. 2 be can frequency multiplication in prior art the circuit theory diagrams of output.
Fig. 3 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail, and execution mode of the present utility model includes but not limited to the following example.
Embodiment
If Fig. 1 and Fig. 2 as shown in are respectively the oscillating circuit of single-frequency output in prior art and oscillating circuit that can frequency multiplication output, shown in Fig. 3 is circuit of the present utility model, i.e. this low noise crystal oscillator circuit, mainly comprise crystal resonator Y1, and main vibration circuit and amplifying circuit that this crystal resonator Y1 two ends are set respectively.Wherein, amplifying circuit comprises the triode Q2 that base stage is connected with crystal resonator Y1, rear one end parallel with one another is connected with triode Q2 emitter and resistance R 3 and the capacitor C 4 of other end ground connection, one end is connected with triode Q2 collector electrode and the capacitor C 6 of other end outputting oscillation signal, and rear one end parallel with one another is connected with triode Q2 collector electrode and capacitor C 5 and the inductance L 2 of other end access power supply.So triode Q2 is adopted to cascode connected mode, by the LC frequency-selective network of collector electrode, can realize easily first-harmonic output or frequency multiplication is exported, when for frequency multiplication, can increase and amplify one-level filter and amplification in rear class.
Main vibration circuit comprises the triode Q1 that base stage is connected with crystal resonator Y1, the capacitor C 2 that two ends are connected with emitter with the base stage of triode Q1 respectively, rear one end parallel with one another is connected with triode Q1 emitter and resistance R 2 and the capacitor C 3 of other end ground connection, one end is connected with triode Q1 base stage and the inductance L 1 of other end ground connection, and the resistance R 1 and the capacitor C 1 that are all connected with triode Q1 collector electrode, wherein, capacitor C 1 ground connection, resistance R 1 access power supply.So take full advantage of the narrow-band filtering characteristic of crystal resonator, thereby can obtain extremely low phase noise.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
According to above-described embodiment, just can realize well the utility model.What deserves to be explained is; under prerequisite based on said structure design; for solving same technical problem; even if some that make on the utility model are without substantial change or polishing; the essence of the technical scheme adopting is still consistent with the utility model, also should be in protection range of the present utility model.
Claims (2)
1. a low noise crystal oscillator circuit, it is characterized in that, comprise crystal resonator Y1, the main vibration circuit being connected with crystal resonator Y1 one end, the amplifying circuit being connected with the crystal resonator Y1 other end, wherein, amplifying circuit comprises the triode Q2 that base stage is connected with crystal resonator Y1, rear one end parallel with one another is connected with triode Q2 emitter and resistance R 3 and the capacitor C 4 of other end ground connection, one end is connected with triode Q2 collector electrode and the capacitor C 6 of other end outputting oscillation signal, and rear one end parallel with one another is connected with triode Q2 collector electrode and capacitor C 5 and the inductance L 2 of other end access power supply.
2. a kind of low noise crystal oscillator circuit according to claim 1, it is characterized in that, described main vibration circuit comprises the triode Q1 that base stage is connected with crystal resonator Y1, the capacitor C 2 that two ends are connected with emitter with the base stage of triode Q1 respectively, rear one end parallel with one another is connected with triode Q1 emitter and resistance R 2 and the capacitor C 3 of other end ground connection, one end is connected with triode Q1 base stage and the inductance L 1 of other end ground connection, and the resistance R 1 and the capacitor C 1 that are all connected with triode Q1 collector electrode, wherein, capacitor C 1 ground connection, resistance R 1 access power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420335909.8U CN203896309U (en) | 2014-06-23 | 2014-06-23 | Low-noise crystal oscillator circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420335909.8U CN203896309U (en) | 2014-06-23 | 2014-06-23 | Low-noise crystal oscillator circuit |
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| Publication Number | Publication Date |
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| CN203896309U true CN203896309U (en) | 2014-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420335909.8U Expired - Lifetime CN203896309U (en) | 2014-06-23 | 2014-06-23 | Low-noise crystal oscillator circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106201968A (en) * | 2016-07-22 | 2016-12-07 | 溧阳市华鹏电力仪表有限公司 | A kind of UART communication interface automatic adjusting method |
| CN107666284A (en) * | 2017-11-10 | 2018-02-06 | 广东圣大电子有限公司 | A kind of high frequency crystal oscillator |
| CN114545998A (en) * | 2022-04-27 | 2022-05-27 | 成都世源频控技术股份有限公司 | Self-adaptive protection temperature control circuit of constant temperature crystal oscillator and implementation method |
-
2014
- 2014-06-23 CN CN201420335909.8U patent/CN203896309U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106201968A (en) * | 2016-07-22 | 2016-12-07 | 溧阳市华鹏电力仪表有限公司 | A kind of UART communication interface automatic adjusting method |
| CN107666284A (en) * | 2017-11-10 | 2018-02-06 | 广东圣大电子有限公司 | A kind of high frequency crystal oscillator |
| CN114545998A (en) * | 2022-04-27 | 2022-05-27 | 成都世源频控技术股份有限公司 | Self-adaptive protection temperature control circuit of constant temperature crystal oscillator and implementation method |
| CN114545998B (en) * | 2022-04-27 | 2022-07-19 | 成都世源频控技术股份有限公司 | Self-adaptive protection temperature control circuit of constant temperature crystal oscillator and implementation method |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 610000, Sichuan, Wuhou District Province, four Xing Road, No. 7, building 2, 166, 1, 4, 5, 2, 3, 4, 5, 6,, 7 Patentee after: CHENGDU SHIYUAN FREQUENCY CONTROL TECHNOLOGY CO.,LTD. Address before: 610000, B, unit 3, 5, 6, 7, No. 166, No. four, Wu Xing Road, 7, Sichuan, Chengdu, Wuhou District, China Patentee before: CHENGDU SHIYUAN FREQUENCY CONTROL TECHNOLOGY Co.,Ltd. |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Low-noise crystal oscillator circuit Effective date of registration: 20170527 Granted publication date: 20141022 Pledgee: Chengdu SME financing Company Limited by Guarantee Pledgor: CHENGDU SHIYUAN FREQUENCY CONTROL TECHNOLOGY CO.,LTD. Registration number: 2017510000028 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20220209 Granted publication date: 20141022 Pledgee: Chengdu SME financing Company Limited by Guarantee Pledgor: CHENGDU SHIYUAN FREQUENCY CONTROL TECHNOLOGY CO.,LTD. Registration number: 2017510000028 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141022 |