CN201360237Y - Constant temperature crystal oscillator - Google Patents
Constant temperature crystal oscillator Download PDFInfo
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- CN201360237Y CN201360237Y CNU2009200838776U CN200920083877U CN201360237Y CN 201360237 Y CN201360237 Y CN 201360237Y CN U2009200838776 U CNU2009200838776 U CN U2009200838776U CN 200920083877 U CN200920083877 U CN 200920083877U CN 201360237 Y CN201360237 Y CN 201360237Y
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- constant temperature
- constant
- crystal oscillator
- temperature
- triode
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Abstract
The utility model discloses a constant temperature crystal oscillator, which comprises a constant temperature groove, a triode and a constant temperature control circuit, wherein the triode is used for heating the constant temperature groove; the constant temperature control circuit is connected with the constant temperature groove and is used for controlling on/off of the triode; the constant temperature control circuit also comprises an integrated calculation module and a circuit unit; the integrated calculation module is connected with the base electrode of the triode; the circuit unit is connected with the integrated calculation module, and the resistance of the circuit unit is changed oppositely to the temperature change of the constant temperature groove. In the utility model, the constant temperature control circuit controls the breakover or stoppage of the triode, so as to control the triode to heat the constant temperature groove, overcome the defects that the constant temperature crystal oscillator needs a longer time to realize temperature constancy, the production and use are not changed and the like in the prior art, realizes the temperature constancy of the constant temperature crystal oscillator in a short time, simplifying the production process for the constant temperature crystal oscillator and improves the working efficiency of the constant temperature crystal oscillator.
Description
Technical field
The utility model relates to a kind of constant-temperature crystal oscillator.
Background technology
In existing crystal oscillator, the accuracy and the stability of constant-temperature crystal oscillator (Oven Controlled CrystalOscillator) are the highest, and it has usually, and ageing rate is low, temperature stability good, the advantages such as long-term stability original text of frequency.Therefore, the constant-temperature crystal oscillator communication of being used widely in fields such as global positioning system, communication, metering, remote measurement, remote controls.
In the prior art, constant-temperature crystal oscillator comprises thermostat, is wrapped in resistance wire on the thermostat etc., realizes in the temperature controlled process at constant-temperature crystal oscillator, generally controls the temperature of thermostat by the heating power of controlling resistance silk.Specifically, exactly the parameter (which type of parameter) by strict controlling resistance silk, flow through the size of current of resistance wire, and wait by the control action of external circuit and to realize thermostatic control.Owing to want to make in the short period temperature constant just to need powerful resistance wire, but, in design, crystal oscillator can not provide enough big voltage and current to offer powerful resistance wire, like this, cause constant-temperature crystal oscillator of the prior art in the process that realizes steady temperature, need the long time.In addition since will be on technology the parameter of strict controlling resistance silk, cause the production of this constant-temperature crystal oscillator and use inconvenience, the parameter index difficulty on the realization theory is bigger.
The utility model content
The purpose of this utility model is to provide a kind of constant-temperature crystal oscillator, realize that in order to overcome constant-temperature crystal oscillator of the prior art temperature constant needs the long period, with and produce and use defectives such as constant, realize making at short notice the constant-temperature crystal oscillator temperature constant, the production technology of constant-temperature crystal oscillator is simplified, improved the operating efficiency of constant-temperature crystal oscillator.
For achieving the above object, the utility model provides a kind of constant-temperature crystal oscillator, and this constant-temperature crystal oscillator comprises: thermostat; Be used to the triode of described thermostat heating, be connected with described thermostat, and the constant temperature control circuit of controlling described triode break-make.
Preferably, described constant temperature control circuit comprises: the integrated computing module that is connected with the base stage of described triode.
Preferably, described constant temperature control circuit comprises with described integrated computing module and being connected, and resistance becomes the circuit unit of inverse variation with the variations in temperature of described thermostat.
Preferably, become the circuit unit of inverse variation with the variations in temperature of described thermostat be a thermistor to described resistance.
Preferably, an end of described thermistor is connected with the reverse input end of described integrated computing module, and the other end is connected with the power supply that control voltage is provided.
In the utility model, conducting by constant temperature control circuit control triode or end, thereby the control triode is to the heating of thermostat, overcome constant-temperature crystal oscillator of the prior art and realized that temperature constant needs the long period, with and produce and use defectives such as constant, realized making the constant-temperature crystal oscillator temperature constant at short notice, simplified the production technology of constant-temperature crystal oscillator, improved the operating efficiency of constant-temperature crystal oscillator.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is the structural representation of oscillating circuit in the prior art;
Fig. 2 is the ac equivalent circuit structural representation of oscillating circuit shown in Figure 1;
Fig. 3 is the structural representation of the utility model constant-temperature crystal oscillator embodiment.
Embodiment
Fig. 1 is the structural representation of oscillating circuit in the prior art, and Fig. 2 is the ac equivalent circuit structural representation of oscillating circuit shown in Figure 1, as depicted in figs. 1 and 2, and Q
1Be NPN type triode, when the frequency of signal is between series resonance frequency FS (series resonance frequency is called for short FS) and the parallel resonance frequency FP (parallel resonance frequency is called for short FP), quartz crystal Y1 just can be perception, and equivalence is an inductance component L
q, direct capacitance C
0, capacitor C 3 and resistance R 1, oscillating circuit just has the condition of carrying out resonance.When the quartz crystal equivalence was inductance element, oscillating circuit shown in Figure 1 was a typical Colpitts oscillation circuit, as long as satisfy the starting condition for oscillation of amplitude A F＞1, oscillating circuit just can starting of oscillation also finally reach balance.
As shown in Figure 2, capacitor C 1 is connected with capacitor C 2, calculates the capacity C of the equivalent capacity after the series connection according to formula C '=C1 * C2/ (C1+C2) '; The direct capacitance C of this equivalence electric capacity and crystal Y1
0Parallel connection, the equivalent capacity capacity after the series connection equals C '+C
0The elasticity equivalent capacity C of last and crystal
q, the electric capacity that always gets is C=C
q(C '+C
0)/C3+C '+C
0), like this, calculate the resonance frequency f that obtains oscillating circuit according to formula 1
0:
Because C
q≤ C '+C
0,, can find out that event is C to what play a decisive role in the oscillation circuit according to formula (1)
q, like this, the resonance frequency f of oscillation circuit
0Approximate series resonance frequency FS.
From above-mentioned analysis as can be known, for the parallel connection type quartz crystal oscillator circuit, its frequency of oscillation basically by the natural frequency of crystal Y1 with very little with its capacitor C in parallel 1 and C2 relation, therefore, owing to the frequency of oscillation drift that the instability of capacitor C 1 and C2 causes is very little, like this, guaranteed resonance frequency f
0Approximate series resonance frequency FS, thereby realized resonance frequency f
0Accurately with stable.
Fig. 3 is the structural representation of the utility model constant-temperature crystal oscillator embodiment.Only show constant temperature control circuit in this circuit, other elements such as thermostat are not shown.As shown in Figure 3, this circuit comprises the thermostat (not shown), triode Q2, constant temperature control circuit etc., wherein, triode Q2 is connected with thermostat, is used to the thermostat heating, constant temperature control circuit is connected with triode Q2, thereby is used for the temperature by the break-make control thermostat of control triode.
Particularly, constant temperature control circuit can comprise integrated computing module U1, and the signal output part of this integrated computing module U1 is connected with the base stage of triode Q2.
Further, constant temperature control circuit can comprise with integrated computing module U1 and being connected, and resistance becomes the circuit unit of inverse variation with the variations in temperature of thermostat.In the present embodiment, resistance becomes the circuit unit of inverse variation can be a thermistor RT with the variations in temperature of described thermostat.Particularly, the end of thermistor RT is connected with the reverse input end of integrated computing module U1, and the other end is connected with the power Vcc that control voltage is provided.
Certainly, constant-temperature crystal oscillator can also comprise other elements, to guarantee the operate as normal of circuit, does not give unnecessary details one by one at this.
Circuit structure below in conjunction with constant-temperature crystal oscillator illustrates the course of work of the utility model constant-temperature crystal oscillator.
When oscillating circuit was worked, the voltage U B of the input in the same way of integrated computing module U1 was greater than its reverse input end voltage U A, and integrated computing module U1 imports in the same way, the relation of the UC of its input terminal voltage and resistance R 5 and R6 as shown in Equation 2:
UC≈UB(R6+R5)/R5 (2)
Because of the base stage of input with triode Q2 is connected, the base current of triode constantly increases, the triode heating, thus the temperature of connected thermostat is raise.When the temperature of triode and thermostat constantly raises, the resistance of thermistor RT will constantly descend, like this, the voltage U A that causes into computing module U1 reverse input end constantly increases, when the voltage U A of reverse input end increases to greater than the voltage U B of input in the same way, integrated computing module U1 oppositely imports.The UC of the output end voltage of integrated transporting discharging module U1 is for negative, and triode ends, no longer heating, and the thermostat temperature no longer raises, and this moment, the temperature of triode was in the crystal inflection temperature.When the temperature of triode Q2 reduces, it is big that the resistance of thermistor RT can become, make the voltage U A of reverse input end of integrated transporting discharging module U1 reduce, as the voltage U A of reverse input end during less than the voltage U B of input in the same way, integrated transporting discharging module U1 imports in the same way, and the UC of the output end voltage of integrated transporting discharging module U1 is for just, triode Q2 conducting, the temperature of triode Q2 also constantly raises, thereby the temperature of thermostat is also constantly raise, until the inflection temperature of crystal.In the whole process of constant temperature control circuit work, the output frequency of measuring circuit determines whether the frequency of oscillation of circuit is the highest or minimum in real time.When the output frequency of measuring circuit is in the highest (SC cuts crystal) or minimum (AT cuts crystal), at this moment, can learn that the temperature of crystal is in inflection temperature, this moment, the output frequency of circuit also can be called as nominal frequency.This moment, the resistance by constant temperature control circuit control thermistor TR was ended triode, thereby guaranteed the temperature constant of thermostat.
In the present embodiment, size by constant temperature control circuit control thermistor resistance, control triode conducting or end, thereby the control triode is to the heating of thermostat, overcome constant-temperature crystal oscillator of the prior art and realized that temperature constant needs the long period, with and produce and use defectives such as constant, realized making at short notice the constant-temperature crystal oscillator temperature constant, simplify the production technology of constant-temperature crystal oscillator, improved the operating efficiency of constant-temperature crystal oscillator.
It should be noted last that: above embodiment only in order to the explanation the technical solution of the utility model, but not makes restrictive sense to the utility model.Although the utility model is had been described in detail with reference to above-mentioned preferred embodiment, those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement the technical solution of the utility model, and this modification or be equal to the spirit and scope that replacement does not break away from technical solutions of the utility model.
Claims (5)
1, a kind of constant-temperature crystal oscillator is characterized in that, comprising: thermostat; Be used to the triode of described thermostat heating, be connected with described thermostat, and the constant temperature control circuit of controlling described triode break-make.
2, constant-temperature crystal oscillator according to claim 1 is characterized in that, described constant temperature control circuit comprises: the integrated computing module that is connected with the base stage of described triode.
3, constant-temperature crystal oscillator according to claim 2 is characterized in that, described constant temperature control circuit comprises with described integrated computing module and being connected, and resistance becomes the circuit unit of inverse variation with the variations in temperature of described thermostat.
4, constant-temperature crystal oscillator according to claim 3 is characterized in that, described resistance becomes the circuit unit of inverse variation with the variations in temperature of described thermostat be a thermistor.
5, constant-temperature crystal oscillator according to claim 4 is characterized in that, an end of described thermistor is connected with the reverse input end of described integrated computing module, and the other end is connected with the power supply that control voltage is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200838776U CN201360237Y (en) | 2009-02-27 | 2009-02-27 | Constant temperature crystal oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200838776U CN201360237Y (en) | 2009-02-27 | 2009-02-27 | Constant temperature crystal oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201360237Y true CN201360237Y (en) | 2009-12-09 |
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ID=41426001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009200838776U Expired - Fee Related CN201360237Y (en) | 2009-02-27 | 2009-02-27 | Constant temperature crystal oscillator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201360237Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102739156A (en) * | 2012-07-03 | 2012-10-17 | 上海鸿晔电子科技有限公司 | Vacuum-integrated triode-heating type constant temperature crystal oscillator |
| CN102820883A (en) * | 2012-08-22 | 2012-12-12 | 东莞市金振电子有限公司 | Temperature control system of constant-temperature crystal oscillator |
| CN110336555A (en) * | 2018-12-31 | 2019-10-15 | 唐山晶源电子有限公司 | A kind of constant-temperature crystal oscillator of frequency stabilization |
-
2009
- 2009-02-27 CN CNU2009200838776U patent/CN201360237Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102739156A (en) * | 2012-07-03 | 2012-10-17 | 上海鸿晔电子科技有限公司 | Vacuum-integrated triode-heating type constant temperature crystal oscillator |
| CN102820883A (en) * | 2012-08-22 | 2012-12-12 | 东莞市金振电子有限公司 | Temperature control system of constant-temperature crystal oscillator |
| CN102820883B (en) * | 2012-08-22 | 2014-12-24 | 东莞市金振电子有限公司 | Temperature control system of constant-temperature crystal oscillator |
| CN110336555A (en) * | 2018-12-31 | 2019-10-15 | 唐山晶源电子有限公司 | A kind of constant-temperature crystal oscillator of frequency stabilization |
| CN110336555B (en) * | 2018-12-31 | 2023-11-24 | 唐山国芯晶源电子有限公司 | Constant temperature crystal oscillator with stable frequency |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091209 Termination date: 20100227 |