CN102739160A - High frequency and low phase noise constant temperature crystal oscillation circuit - Google Patents
High frequency and low phase noise constant temperature crystal oscillation circuit Download PDFInfo
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- CN102739160A CN102739160A CN2012102284371A CN201210228437A CN102739160A CN 102739160 A CN102739160 A CN 102739160A CN 2012102284371 A CN2012102284371 A CN 2012102284371A CN 201210228437 A CN201210228437 A CN 201210228437A CN 102739160 A CN102739160 A CN 102739160A
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Abstract
A high frequency and low phase noise constant temperature crystal oscillation circuit relates to the technical field of crystal oscillators, and aims to solve the technical problems that the current circuit has a difficulty in oscillation starting and has a high phase noise. The circuit comprises a crystal resonator, a low phase noise triode, and an output capacitor. One end of the crystal resonator is connected to the base electrode of the low phase noise triode. The other end of the crystal resonator is connected to an externally outputted voltage-controlled voltage source, and is connected to the ground through a varactor. One end of the output capacitor is connected to the collector electrode of the low phase noise triode. The other end of the output capacitor forms the output terminal of the oscillation circuit. The circuit is characterized by further comprising an auxiliary inductor. The auxiliary inductor is connected with the crystal resonator in parallel. The emitter electrode of the low phase noise triode is connected to the base electrode of the low phase noise triode through an adjustable capacitor, is connected to the ground through another adjustable capacitor, and is connected to the ground through an adjustable inductor and an adjustable resistor successively. The circuit provided by the invention is applicable in the small-size constant temperature crystal oscillator.
Description
Technical field
The present invention relates to the crystal oscillator technology, particularly relate to the technology of the low constant temperature crystal oscillating circuit of making an uproar mutually of a kind of high frequency points.
Background technology
The high frequency points constant-temperature crystal oscillator is a crucial frequency radix parts in radar communication, measurement field of test instrument; Its low phase noise and small size also are the prospects of the market demand, and the equiva lent impedance (ESR) of crystal causes oscillator starting of oscillation difficulty, failure of oscillation greatly but the high frequency points constant-temperature crystal oscillator tends to.
As shown in Figure 2; Can consume certain power during traditional crystal oscillation circuit active load, thereby can cause the Q value of crystal resonator Y11 to reduce, make the stability decreases of crystal resonator Y11; Influenced by peripheral active block; Play pendulum, depressed phenomenon when shaking when occurring, phase noise has also received influence.High frequency constant-temperature crystal oscillator with the 100MHz frequency that adopts traditional oscillator circuit is an example, its crystal resonator starting of oscillation difficulty, and the noise objective consistency is poor; And be unfavorable for volume production, when output frequency was 1KHz, the phase noise index was generally at-135dBc/Hz; When output frequency is 10KHz; Generally at-145dBc/Hz, when output frequency was 100KHz, the phase noise index can reach-150dBc/Hz the phase noise index.
Summary of the invention
To the defective that exists in the above-mentioned prior art, technical problem to be solved by this invention provides a kind of easy starting of oscillation, and the low low constant temperature crystal oscillating circuit of making an uproar mutually of high frequency points of phase noise.
In order to solve the problems of the technologies described above, the low constant temperature crystal oscillating circuit of making an uproar mutually of a kind of high frequency points provided by the present invention comprises crystal resonator, low make an uproar mutually triode, output capacitance;
One of said crystal resonator terminates to the base stage of the low triode of making an uproar mutually, the voltage-controlled voltage of the outside input of another termination, and warp one varactor is received ground;
The base stage of the said low triode of making an uproar is mutually received ground through a biasing resistor, and connects the outside supply power voltage of importing through another biasing resistor, and the collector electrode of the low triode of making an uproar is mutually received the supply power voltage of outside input through a load resistance;
The collector electrode of the low triode of making an uproar mutually of one termination of said output capacitance, the other end constitutes output end of oscillating circuit;
It is characterized in that: also comprise an auxiliary induction, said auxiliary induction is parallelly connected with crystal resonator;
The emitter of the said low triode of making an uproar is mutually received the base stage of hanging down the triode of making an uproar mutually through a control capacittance, receives ground through another control capacittance, and regulates resistance through an adjusting inductance, successively and receive ground.
The low constant temperature crystal oscillating circuit of making an uproar mutually of high frequency points provided by the invention, between the crystal resonator bipod parallel connection auxiliary induction, eliminated the inner direct capacitance C0 value of crystal resonator from the outside; It is littler to make that the internal impedance of crystal resonator is compared the conventional crystal oscillating circuit, is more prone to starting of oscillation, and through regulating inductance, regulating the multiplication factor that resistance and two control capacittances can improve mutual conductance and the electric current of the low triode Q1 that makes an uproar mutually; Make circuit starting of oscillation more easily; And the Q value of crystal resonator is not a greater impact, and noise has also obtained optimization, and the noise objective consistency is better; Can reach about 95%, help a large amount of productions.
Description of drawings
Fig. 1 is the circuit diagram of the low constant temperature crystal oscillating circuit of making an uproar mutually of high frequency points of the embodiment of the invention;
Fig. 2 is the circuit diagram of traditional crystal oscillation circuit.
Embodiment
Below in conjunction with description of drawings embodiments of the invention are described in further detail, but present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar variation thereof all should be listed protection scope of the present invention in.
As shown in Figure 1, the low constant temperature crystal oscillating circuit of making an uproar mutually of a kind of high frequency points that the embodiment of the invention provided comprises crystal resonator Y1, low make an uproar mutually triode Q1, output capacitance C5;
The end of said crystal resonator Y1 is received the base stage of hanging down the triode Q1 that makes an uproar mutually through a capacitor C 1, the voltage-controlled voltage VC of the outside input of another termination, and warp one varactor CR1 receives ground;
The base stage of the said low triode Q1 that makes an uproar is mutually received ground through a biasing resistor R2; And meeting the supply power voltage VCC supply of outside input through another biasing resistor R1, the collector electrode of the low triode Q1 that makes an uproar mutually meets the supply power voltage VCC supply of outside input through a load resistance R3;
The collector electrode of the low triode Q1 that makes an uproar mutually of the termination of said output capacitance C5, the other end constitutes output end of oscillating circuit;
It is characterized in that: also comprise an auxiliary induction L2, said auxiliary induction L2 is parallelly connected with crystal resonator Y1;
The emitter of the said low triode Q1 that makes an uproar is mutually received the base stage of hanging down the triode Q1 that makes an uproar mutually through a control capacittance C2, and C3 receives ground through another control capacittance, and regulates resistance R 4 through an adjusting inductance L 1, successively and receive ground.
In the embodiment of the invention, said crystal resonator Y1 is 5 overtone crystals of 100M AT cut type, and the model of the said low triode Q1 that makes an uproar mutually is BFR92AW, and the model of said varactor CR1 is BB202.
The operation principle of the embodiment of the invention is following:
The voltage-controlled voltage VC of outside input is input to crystal resonator Y1; Under the effect of auxiliary induction L2; Eliminated the inner direct capacitance C0 value of crystal resonator Y1 from the outside; Make that the internal impedance of crystal resonator Y1 is less relatively, be more prone to starting of oscillation, the output of crystal resonator Y1 is exported through output capacitance C5 after low make an uproar mutually triode Q1 mutual conductance and amplification;
Through the capacitance of two control capacittance C2 of suitable adjusting, C3, can improve the multiplication factor of mutual conductance and the electric current of the low triode Q1 that makes an uproar mutually, make circuit starting of oscillation more easily.
The embodiment of the invention is applicable to the constant-temperature crystal oscillator of output frequency in the 50-200MHz scope, can be used for the small size constant-temperature crystal oscillator, is easy to starting of oscillation; The noise objective consistency is better, can reach about 95%, helps a large amount of productions; When output frequency is 1KHz; The phase noise index can reach-145dBc/Hz, and when output frequency was 10KHz, the phase noise index can reach-158dBc/Hz; When output frequency was 100KHz, the phase noise index can reach-162dBc/Hz.
Claims (1)
1. the low constant temperature crystal oscillating circuit of making an uproar mutually of high frequency points comprises crystal resonator, low make an uproar mutually triode, output capacitance;
One of said crystal resonator terminates to the base stage of the low triode of making an uproar mutually, the voltage-controlled voltage of the outside input of another termination, and warp one varactor is received ground;
The base stage of the said low triode of making an uproar is mutually received ground through a biasing resistor, and connects the outside supply power voltage of importing through another biasing resistor, and the collector electrode of the low triode of making an uproar is mutually received the supply power voltage of outside input through a load resistance;
The collector electrode of the low triode of making an uproar mutually of one termination of said output capacitance, the other end constitutes output end of oscillating circuit;
It is characterized in that: also comprise an auxiliary induction, said auxiliary induction is parallelly connected with crystal resonator;
The emitter of the said low triode of making an uproar is mutually received the base stage of hanging down the triode of making an uproar mutually through a control capacittance, receives ground through another control capacittance, and regulates resistance through an adjusting inductance, successively and receive ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102284371A CN102739160A (en) | 2012-07-04 | 2012-07-04 | High frequency and low phase noise constant temperature crystal oscillation circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102284371A CN102739160A (en) | 2012-07-04 | 2012-07-04 | High frequency and low phase noise constant temperature crystal oscillation circuit |
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| CN102739160A true CN102739160A (en) | 2012-10-17 |
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| CN2012102284371A Pending CN102739160A (en) | 2012-07-04 | 2012-07-04 | High frequency and low phase noise constant temperature crystal oscillation circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196647A (en) * | 2017-05-30 | 2017-09-22 | 长沙方星腾电子科技有限公司 | A kind of crystal-oscillator circuit |
| CN113067466A (en) * | 2021-05-19 | 2021-07-02 | 上海鸿晔电子科技股份有限公司 | Voltage source circuit and power management chip |
-
2012
- 2012-07-04 CN CN2012102284371A patent/CN102739160A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196647A (en) * | 2017-05-30 | 2017-09-22 | 长沙方星腾电子科技有限公司 | A kind of crystal-oscillator circuit |
| CN113067466A (en) * | 2021-05-19 | 2021-07-02 | 上海鸿晔电子科技股份有限公司 | Voltage source circuit and power management chip |
| CN113067466B (en) * | 2021-05-19 | 2022-06-24 | 上海鸿晔电子科技股份有限公司 | Voltage source circuit and power management chip |
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Application publication date: 20121017 |