CN108923751A - A kind of crystal oscillator mode suppression circuit - Google Patents
A kind of crystal oscillator mode suppression circuit Download PDFInfo
- Publication number
- CN108923751A CN108923751A CN201810947828.6A CN201810947828A CN108923751A CN 108923751 A CN108923751 A CN 108923751A CN 201810947828 A CN201810947828 A CN 201810947828A CN 108923751 A CN108923751 A CN 108923751A
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- crystal
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- transistor
- inductance
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- 239000013078 crystal Substances 0.000 title claims abstract description 62
- 230000001629 suppression Effects 0.000 title claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims abstract description 34
- 230000010355 oscillation Effects 0.000 claims abstract description 29
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 9
- 230000005764 inhibitory process Effects 0.000 claims description 17
- 230000005669 field effect Effects 0.000 claims description 9
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/02—Details
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
- H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
Abstract
The present invention discloses a kind of crystal oscillator mode suppression circuit, including：Power end, second node, crystal, the first oscillating capacitance, the second oscillating capacitance, inhibits circuit and amplifier element at first node.The present invention provides a kind of crystal oscillator mode suppression circuit, only by adusting inductance L1With capacitor C1, make its resonance at or near the C mould frequency that SC cuts overtone number needed for crystal, so that it may play the role of inhibiting B mould and other overtone frequencies, debugging is simple.Mode suppression is carried out merely with amplitude condition, small on the influence of oscillation phase condition, debugging is convenient, and parameter coupling is small, vibrates the oscillating capacitance C in resonant tank2And C3Can be according to starting condition for oscillation, and increase crystal loaded Q etc. and require separately adjustable, frequency of oscillation stability and oscillator signal quality can be effectively improved, circuit environment is adaptable, high reliablity.
Description
Technical field
The present invention relates to crystal oscillator technologies fields.More particularly, to a kind of crystal oscillator mode suppression circuit.
Background technique
Crystal oscillator is a kind of high stable time and frequency standards, can be widely used for various communications, navigation and measurement and sets
In standby.Crystal is the Primary Component in crystal oscillator, and using different types of crystal, oscillator performance is different.Wherein, it uses
SC cuts the crystal oscillator of crystal, since the Q value that SC cuts crystal is higher, available more excellent phase noise performance.SC
It cuts in crystal comprising A mould, B mould and several vibration modes of C mould and fundamental frequency, several overtone moulds such as overtone, fifth overtone three times
Formula.C mold has the features such as stress compensation effect, good anti-vibration, thermal transient is small, generally cuts crystal using SC in crystal oscillator
C mould mode.In order to need in oscillating circuit through circuit form appropriate and ginseng using the C mould and higher overtone of crystal
Number is to inhibit B mould and low order overtone.Fig. 1 is typically used as the Pierce oscillator circuit that SC cuts crystal, it mainly utilizes oscillating phase
Position condition carries out mode suppression.Wherein inductance Lf, capacitor CfWith inductance LeForm B mould and overtone suppression circuit.SC cuts crystal n times
Overtone number C mould frequency f0It is the frequency of oscillation of oscillating circuit.Crystal n times overtone B mould frequency is fB.The secondary overtone B mould of crystal (N-2)
Frequency is fN-2.Inductance LfWith capacitor CfSeries resonance frequency is f1.Inductance Lf, capacitor CfWith inductance LeParallel resonance frequency is f2,
In frequency f0Place is equivalent to capacitor C ".In order to work normally oscillating circuit in frequency f0Place, inductance Lf, capacitor CfWith inductance Le's
Parameter value needs to meet Equation fB>f1>f0>f2>fN-2.C " should be less than the starting of oscillation capacitor of oscillating circuit.As it can be seen that for determination
Solution obtains suitable parameters value, calculates complicated, direct solution difficulty.It is solved using parameter heuristic, it usually needs sound out repeatedly
Repeatedly, the parametric solution that can be just met the requirements and easily be realized, solution efficiency is low, computationally intensive.Moreover, SC cuts the B mould of crystal
It is close with C mould frequency；As overtone number increases, overtone interval also reduces.So inductance L in Fig. 1f, capacitor CfWith inductance Le
Parameter adjustable range it is small, the minor change of parameter can bring the significant change of equivalence value, significantly affect oscillating condition, that is, vibrate
Circuit is to suppression circuit element inductors Lf, capacitor CfWith inductance LeParameter it is more sensitive.In particular, as frequency of oscillation increases, vibration
It is more sensitive to suppression circuit parameter to swing circuit, inconvenient debugging high to component parameter required precision.When environment temperature etc. because
Element variation when circuit parameter being made to drift about, easily occurs not inhibiting the phenomenon that B mould and other overtone modes, influencing product makes
Use reliability.
Summary of the invention
To solve the above-mentioned problems at least one, the present invention provides a kind of crystal oscillator mode suppression circuit, including：
Power end, first node, second node, crystal, the first oscillating capacitance, the second oscillating capacitance, inhibit circuit and
Amplifier element；
Described crystal one end, the output end of amplifier element and the second oscillating capacitance are connected by first node and power end
It connects；
First oscillating capacitance is connect with the crystal other end and the second node；
The input terminal of the amplifier element is connect with the crystal other end
The inhibition circuit is connect with the common end of the amplifier element and the second node；
Second oscillating capacitance and second node ground connection, so that the crystal, the first oscillating capacitance, the second oscillation
Oscillation circuit is collectively formed in capacitor.
Preferably, the inhibition circuit includes：
First connect with the common end of amplifier element inhibits inductance, the inhibition capacitor with the inductance connection；
Wherein, the inhibition capacitor is connect with the second node.
Preferably, the circuit further comprises：
Second be connected between the power end and the first node inhibits inductance or resistance.
Preferably, the inhibition circuit further comprises：
With the first inhibition inductance and the resistance for inhibiting capacitor to be connected in parallel.
Preferably, the amplifier element is transistor.
Preferably, the transistor is bipolar junction transistor and field-effect tube.
Preferably, the transistor is field-effect tube, and the field-effect tube includes PMOS transistor and NMOS transistor.
Preferably, the transistor is bipolar junction transistor, and the bipolar junction transistor includes PNP transistor and NPN brilliant
Body pipe.
Preferably, the crystal is that SC cuts crystal.
Beneficial effects of the present invention are as follows：
The present invention provides a kind of crystal oscillator mode suppression circuit, only by adusting inductance L1With capacitor C1, make its resonance
It is cut at or near crystal C mould frequency in SC, so that it may play the role of inhibiting B mould and other overtone frequencies, debugging is simple.Inductance
L1With capacitor C1The B mould and overtone suppression circuit of composition are separated with oscillation resonant tank, and it is short that exchange is played at C mode oscillation frequency
The function on road has substantially no effect on oscillation resonant tank parameter, i.e., mode suppression is carried out merely with amplitude condition, to oscillation phase item
Part influence is small, and debugging is convenient, and parameter coupling is small.Vibrate the oscillating capacitance C in resonant tank2And C3Can according to starting condition for oscillation, with
And increase crystal loaded Q etc. and require separately adjustable, frequency of oscillation stability and oscillator signal quality can be effectively improved.Inductance L1
With capacitor C1The resonant network of composition has certain bandwidth, to inductance L1With capacitor C1Parameters precision it is of less demanding, when crystal shake
The variation of device working environment is swung when causing parameter drift, and oscillating condition is substantially unaffected, and circuit environment is adaptable, reliability
It is high.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
Fig. 1 shows a kind of Pierce oscillator circuit structural schematic diagram in the prior art.
Fig. 2 shows the crystal oscillator mode suppression electrical block diagrams in the embodiment of the present invention.
Specific embodiment
In order to illustrate more clearly of the present invention, the present invention is done further below with reference to preferred embodiments and drawings
It is bright.Similar component is indicated in attached drawing with identical appended drawing reference.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
As shown in connection with fig. 2, the present invention provides a kind of crystal oscillator mode suppression circuit, including：Power end Vcc, first
Node P1, second node P2, crystal G1, the first oscillating capacitance C2, the second oscillating capacitance C3, inhibit circuit and amplifier element V1；
The crystal G1One end, amplifier element V1Output end and the second oscillating capacitance C3Pass through first node P1Connect with power end Vcc
It connects；The first oscillating capacitance C2With the crystal G1The other end and the second node P2Connection；The amplifier element V1It is defeated
Enter end and the crystal G1Other end connection；The inhibition circuit and the amplifier element V1Common end and the second node
P2Connection；The second oscillating capacitance C3With the second node P2Ground connection, so that the crystal G1, the first oscillating capacitance C2,
Two oscillating capacitance C3Oscillation circuit is collectively formed.
Wherein, the inhibition circuit includes：With amplifier element V1Common end connection first inhibit inductance L1, with it is described
Inductance L1The inhibition capacitor C of connection1.Wherein, the inhibition capacitor C1With the second node P2Connection.
Certainly, inhibiting circuit further includes inhibiting inductance L with described first1With inhibition capacitor C1The resistance R being connected in parallel1.Electricity
The effect of resistance is for providing DC channel, and as amplifier element provides quiescent point.
The present invention provides a kind of crystal oscillator mode suppression circuit, only by adusting inductance L1With capacitor C1, make its resonance
At or near the C mould frequency that SC cuts overtone number needed for crystal, so that it may play the work for inhibiting B mould and other overtone frequencies
With debugging is simple.Inductance L1With capacitor C1The B mould and overtone suppression circuit of composition are separated with oscillation resonant tank, in C mode oscillation
The function that ac short circuit is played at frequency has substantially no effect on oscillation resonant tank parameter, i.e., carries out mode merely with amplitude condition
Inhibit, small on the influence of oscillation phase condition, debugging is convenient, and parameter coupling is small.Vibrate the oscillating capacitance C in resonant tank2And C3It can
It is separately adjustable to be required according to starting condition for oscillation, and increase crystal loaded Q etc., frequency of oscillation stability and vibration can be effectively improved
Swing signal quality.Inductance L1With capacitor C1The resonant network of composition has certain bandwidth, to inductance L1With capacitor C1Parameters precision
Of less demanding, when the variation of crystal oscillator working environment causes parameter drift, oscillating condition is substantially unaffected, circuit environment
It is adaptable, high reliablity.
Certainly, it in order to make the reliable and stable work of transistor V1, needs that suitable quiescent point is arranged for it in circuit.Just
As it is known by the man skilled in the art, other than needing to provide the DC channel having shown that in Fig. 2 for transistor V1, it is also necessary to
Appropriate DC potential is provided for the base stage of transistor V1.This be usually by base stage in transistor V1 and power end Vcc it
Between connect resistance, or connect resistance between power end Vcc and ground terminal in the base stage of transistor V1 respectively and realize.Meanwhile in order to
Quality of output signals is improved, is also required to increase filter capacitor between power end Vcc and ground, to inhibit the exchange of power end Vcc dry
It disturbs.
Further, the circuit further comprises：It is connected to the power end Vcc and the first node P1Between
Second inhibits inductance L2Or resistance, for inhibiting the AC signal of power end and providing quiescent point.
Preferably, amplifier element is transistor, specifically, can be bipolar junction transistor or field-effect tube, more specifically,
When the transistor is bipolar junction transistor, the bipolar junction transistor includes PNP transistor and NPN transistor.When the crystalline substance
Body pipe is field-effect tube, and the field-effect tube includes p channel transistor and N-channel transistor.
Well known to a person skilled in the art amplifier elements when amplifier element is bipolar junction transistor, in the present embodiment
Output end be transistor collector, the input terminal of amplifier element is the base stage of triode, and the common end of amplifier element is three poles
The emitter of pipe, it will not go into details by the present invention.
Certainly, the prior art refers to according to the present invention, and the crystal in the present invention can cut crystal for SC, and the present invention refuses
It repeats.
The present invention is by inductance L in Fig. 1f, capacitor CfWith inductance LeThe parallel network of composition is split as inductance L in Fig. 21And electricity
Hold C1The B mould and overtone being composed in series inhibit network and oscillating capacitance C3Two parts make that network and oscillation circuit is inhibited to separate,
The parameter coupling inhibited between network and oscillation circuit is reduced, debugging process interference is small, simple and easy to operate.Also, inhibit network
Oscillation circuit is accessed by the emitter of triode, it is higher with the isolation of oscillation resonant tank.Inductance L1With capacitor C1Parameter
Variation is smaller on oscillation resonant tank parameter influence, has substantially no effect on oscillation phase condition, influences also very on crystal loaded Q
It is small, the available preferable frequency stability of oscillating circuit.Inductance L1With capacitor C1Series resonance frequency be SC cut crystal use
C mould frequency at overtone number.When frequency departure C mould frequency, inductance L1With capacitor C1Equivalent impedance increase, oscillation amplification
Circuit gain reduces, and oscillating condition weakens, and inhibits principle simple and easily realizes.Inductance L1With capacitor C1Series resonance have one
Bandwidth is determined, as long as resonance reduces the requirement to component parameter accuracy near C mould frequency.Also, when needs
When increase voltage-controlled circuit or the variation of crystal oscillator working environment cause parameter drift, as long as frequency of oscillation is still in inductance L1With
Capacitor C1Series resonance bandwidth range in, oscillating circuit can still work normally, therefore circuit environment is adaptable, reliability
It is high.
Also, the present invention while guaranteeing easy can inhibit SC to cut the B mould and other overtone modes of crystal, it can be achieved that compared with
High frequency stability.Circuit reliability is high, and environmental suitability is strong, has stronger practicability.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention may be used also on the basis of the above description for those of ordinary skill in the art
To make other variations or changes in different ways, all embodiments can not be exhaustive here, it is all to belong to this hair
The obvious changes or variations that bright technical solution is extended out are still in the scope of protection of the present invention.
Claims (9)
1. a kind of crystal oscillator mode suppression circuit, which is characterized in that including：
Power end, second node, crystal, the first oscillating capacitance, the second oscillating capacitance, inhibits circuit and amplification at first node
Element；
Described crystal one end, the output end of amplifier element and the second oscillating capacitance are connect by first node with power end；
First oscillating capacitance is connect with the crystal other end and the second node；
The input terminal of the amplifier element is connect with the crystal other end；
The inhibition circuit is connect with the common end of the amplifier element and the second node；
Second oscillating capacitance and second node ground connection, so that the crystal, the first oscillating capacitance, the second oscillating capacitance
Oscillation circuit is collectively formed.
2. circuit according to claim 1, which is characterized in that the inhibition circuit includes：
First connect with the common end of amplifier element inhibits inductance, the inhibition capacitor with the inductance connection；
Wherein, the inhibition capacitor is connect with the second node.
3. circuit according to claim 1, which is characterized in that the circuit further comprises：
Second be connected between the power end and the first node inhibits inductance or resistance.
4. circuit according to claim 2, which is characterized in that the inhibition circuit further comprises：
With the first inhibition inductance and the resistance for inhibiting capacitor to be connected in parallel.
5. circuit according to claim 1, which is characterized in that the amplifier element is transistor.
6. circuit according to claim 5, which is characterized in that the transistor is bipolar junction transistor and field-effect tube.
7. circuit according to claim 6, which is characterized in that the transistor is bipolar junction transistor, the ambipolar crystalline substance
Body pipe includes PNP transistor and NPN transistor.
8. circuit according to claim 6, which is characterized in that the transistor is field-effect tube, and the field-effect tube includes P
Channel transistor and N-channel transistor.
9. circuit according to claim 1, which is characterized in that the crystal is that SC cuts crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810947828.6A CN108923751B (en) | 2018-08-20 | 2018-08-20 | Crystal oscillator mode suppression circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810947828.6A CN108923751B (en) | 2018-08-20 | 2018-08-20 | Crystal oscillator mode suppression circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108923751A true CN108923751A (en) | 2018-11-30 |
| CN108923751B CN108923751B (en) | 2022-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810947828.6A Active CN108923751B (en) | 2018-08-20 | 2018-08-20 | Crystal oscillator mode suppression circuit |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55147808A (en) * | 1979-05-07 | 1980-11-18 | Sony Corp | Overtone oscillator |
| JP2004266583A (en) * | 2003-02-28 | 2004-09-24 | Toyo Commun Equip Co Ltd | Piezoelectric oscillator |
| JP2006148266A (en) * | 2004-11-16 | 2006-06-08 | Kyocera Kinseki Corp | Crystal oscillator |
| US20060273860A1 (en) * | 2005-06-07 | 2006-12-07 | Kenji Kasahara | Colpitts oscillator |
| CN1877984A (en) * | 2005-06-07 | 2006-12-13 | 日本电波工业株式会社 | Crystal oscillation circuit |
| CN201360238Y (en) * | 2009-02-26 | 2009-12-09 | 唐山晶源裕丰电子股份有限公司 | Voltage-controlled triple overtone crystal oscillator |
| CN101645691A (en) * | 2008-08-05 | 2010-02-10 | 日本电波工业株式会社 | Secondary vibration damping type crystal oscillator circuit |
| WO2014123519A1 (en) * | 2013-02-06 | 2014-08-14 | Empire Technology Development Llc | Devices, systems, and methods for detecting odorants |
-
2018
- 2018-08-20 CN CN201810947828.6A patent/CN108923751B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55147808A (en) * | 1979-05-07 | 1980-11-18 | Sony Corp | Overtone oscillator |
| JP2004266583A (en) * | 2003-02-28 | 2004-09-24 | Toyo Commun Equip Co Ltd | Piezoelectric oscillator |
| JP2006148266A (en) * | 2004-11-16 | 2006-06-08 | Kyocera Kinseki Corp | Crystal oscillator |
| US20060273860A1 (en) * | 2005-06-07 | 2006-12-07 | Kenji Kasahara | Colpitts oscillator |
| CN1877984A (en) * | 2005-06-07 | 2006-12-13 | 日本电波工业株式会社 | Crystal oscillation circuit |
| CN101645691A (en) * | 2008-08-05 | 2010-02-10 | 日本电波工业株式会社 | Secondary vibration damping type crystal oscillator circuit |
| CN201360238Y (en) * | 2009-02-26 | 2009-12-09 | 唐山晶源裕丰电子股份有限公司 | Voltage-controlled triple overtone crystal oscillator |
| WO2014123519A1 (en) * | 2013-02-06 | 2014-08-14 | Empire Technology Development Llc | Devices, systems, and methods for detecting odorants |
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| Publication number | Publication date |
|---|---|
| CN108923751B (en) | 2022-07-08 |
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