CN201904759U - High-precision temperature control crystal oscillator - Google Patents
High-precision temperature control crystal oscillator Download PDFInfo
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- CN201904759U CN201904759U CN201020690846XU CN201020690846U CN201904759U CN 201904759 U CN201904759 U CN 201904759U CN 201020690846X U CN201020690846X U CN 201020690846XU CN 201020690846 U CN201020690846 U CN 201020690846U CN 201904759 U CN201904759 U CN 201904759U
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Abstract
The utility model discloses a high-precision temperature control crystal oscillator. The circuit of the oscillator comprises a temperature control circuit and a main vibration circuit, wherein the temperature control circuit comprises a thermosensitive resistor RT1 with a medium B value in negative temperature coefficient, two operational amplifiers IC1A and IC1B, and two PNP triodes Q1 and Q2. By considering merits and demerits in the traditional technology and the prior art, a temperature control circuit with two operational amplifiers and two monitoring points is created, so that a precise temperature control effect to three operational amplifiers can be achieved and the heating control is more precise and more accurate owning to the simultaneous monitoring performed by heat parameters and current parameters; meanwhile, the manufacturing cost is reduced, and the thermosensitive resistor is connected with the circuit in a grounded manner, so that the debug is convenient; and a batch production can be realized. The crystal oscillator provided by the utility model are more competitive compared with foreign ones.
Description
Technical field
The utility model relates to electronics and circuit engineering field, relates in particular to a kind of circuit of temperature control crystal oscillator, comprises sample circuit and main vibration circuit.
Background technology
Constant-temperature crystal oscillator carries out constant temperature and precise temperature control realization to crystal.It is widely used in the electronic instruments such as global positioning system, communication, metering, remote measuring and controlling, frequency spectrum and network analyzer as accurate time frequency signal source, is the core devices of all electronic equipments, is praised " heart " by name.
Domestic temperature-adjusting circuit principal mode is to adopt single amplifier single argument control type at present, and heating tube generally adopts field effect transistor.This heating temperature-adjusting circuit, owing to have only single group variable parameter, too simple, temperature control is not very accurate, thereby causes the temperature fluctuation amplitude of constant temperature cell body of product bigger, and then influences the performance of entire product; And have part producer to adopt three amplifier temperature-adjusting circuits abroad, and this heater circuit complexity, the cost height is debugged diverse and complicatedly, and there is higher requirement on technical staff's basis, has increased the material cost of product simultaneously, and the advantage of therefore striving unexpectedly is not obvious, is difficult to apply.Because it is slow that the inductive effects of temperature sensing relatively stagnates, come work if depend merely on sense temperature control heating tube, then effect is unsatisfactory.
Summary of the invention
The technical problems to be solved in the utility model is the defective at prior art, and the high-accuracy temperature control crystal oscillator that a kind of cost is lower, debugging is convenient, have the precise temperature control effect is provided.
For solving the problems of the technologies described above, the utility model adopts following technical scheme: a kind of high-accuracy temperature control crystal oscillator, the circuit of this oscillator comprises the circuit of temperature-adjusting circuit and driver unit, it is characterized in that: the circuit of temperature-adjusting circuit comprises that the thermistor RT1(thermistor of a negative temperature coefficient is medium B value) two operational amplifier IC1A, IC1B, two PNP triode Q1 and Q2; Thermistor RT1 one end ground connection, the other end connect temperature controlling point and regulate resistance R 8, and resistance R 8 other ends connect resistance R 5, and resistance R 5 connects resistance R 6, resistance R 6 other end ground connection; Pick out one the tunnel between resistance R 8 and the thermistor RT1 and be connected resistance R 9, the end of oppisite phase of resistance R 9 concatenation operation amplifier IC1A, the in-phase end of operational amplifier IC1A connects resistance R 7, and resistance R 7 other ends are connected between resistance R 5 and the resistance R 6; Cross-over connection has sensitivity adjusting circuit between the end of oppisite phase of operational amplifier IC1A and the output; The output of operational amplifier IC1A connects resistance R 4, the in-phase end of resistance R 4 concatenation operation amplifier IC1B, and the end of oppisite phase of operational amplifier IC1B connects resistance R 2; The output of operational amplifier IC1B connects the base stage of triode Q1, and triode Q1 connects the base stage of triode Q2; The emitter of triode Q1 connects power supply VCC by resistance R 0, and the emitter of triode Q2 connects power supply VCC, the grounded collector of triode Q1 and triode Q2 by another resistance R 0; Be connected with resistance R 1 between the emitter of the end of oppisite phase of operational amplifier IC1B and triode Q1, be connected with another resistance R 1 between the emitter of the end of oppisite phase of operational amplifier IC1B and triode Q2; Be connected with control capacittance Cf1 between the output of operational amplifier IC1B and the end of oppisite phase, the in-phase end of operational amplifier IC1B is connected with resistance R 3; Operational amplifier IC1A is connected power supply VCC and ground connection respectively separately with operational amplifier IC1B; R8, R5 and R2 connect interior voltage-stabilized power supply; Temperature-adjusting circuit adopts the double operational structure.
The circuit of driver unit comprises triode V1, crystal oscillator BC1, capacitor C t, capacitor C 3, capacitor C 4, the grounded emitter of triode V1, be connected with capacitor C 3 between the base stage of triode V1 and the emitter, be connected with capacitor C 4 between the collector electrode of triode V1 and the emitter, the base stage of triode V1 connects crystal oscillator BC1, crystal oscillator BC1 connects capacitor C t, and capacitor C t connects the collector electrode of triode.
Further, thermistor RT1 one end links to each other with ground, and two ends and be connected to filter capacitor C2.
Further, described sensitivity adjusting circuit comprises an adjustable resistance Rf, adjustable resistance Rf series connection tunable capacitor Cf2, adjustable resistance Rf tunable capacitor Cf3 in parallel with tunable capacitor Cf2.
Further, two resistance R 0 are connected filter capacitor C1 with the end that power supply VCC links to each other.
The utility model has been created the temperature-adjusting circuit of the two control points of double operational in conjunction with the pluses and minuses of both sides in the conventional art, can reach the precise temperature control effect of three amplifiers, and monitoring when utilizing physochlaina infudibularis amount and current parameter makes that the control of heating is meticulousr, more accurate; And both reduced production cost, thermistor is with the mode place in circuit of ground connection simultaneously, and debugging is very convenient, and can realize production in batches, relatively has more competitiveness with external like product.
Description of drawings
Fig. 1 is the utility model temperature-adjusting circuit schematic diagram;
Fig. 2 is the utility model main vibration circuit schematic diagram.
Embodiment
In the present embodiment, see figures.1.and.2, described high-accuracy temperature control crystal oscillator, the circuit of this oscillator comprises the circuit of temperature-adjusting circuit and driver unit, the circuit of temperature-adjusting circuit comprises the thermistor RT1 of a negative temperature coefficient, two operational amplifier IC1A, IC1B, two PNP triode Q1 and Q2; Thermistor RT1 one end ground connection, the other end connect temperature controlling point and regulate resistance R 8, and resistance R 8 other ends connect resistance R 5, and resistance R 5 connects resistance R 6, resistance R 6 other end ground connection; Pick out one the tunnel between resistance R 8 and the thermistor RT1 and be connected resistance R 9, the end of oppisite phase of resistance R 9 concatenation operation amplifier IC1A, the in-phase end of operational amplifier IC1A connects resistance R 7, and resistance R 7 other ends are connected between resistance R 5 and the resistance R 6; Cross-over connection has sensitivity adjusting circuit between the end of oppisite phase of operational amplifier IC1A and the output; The output of operational amplifier IC1A connects resistance R 4, the in-phase end of resistance R 4 concatenation operation amplifier IC1B, and the end of oppisite phase of operational amplifier IC1B connects resistance R 2; The output of operational amplifier IC1B connects the base stage of triode Q1, and triode Q1 connects the base stage of triode Q2; The emitter of triode Q1 connects power supply VCC by resistance R 0, and the emitter of triode Q2 connects power supply VCC, the grounded collector of triode Q1 and triode Q2 by another resistance R 0; Be connected with resistance R 1 between the emitter of the end of oppisite phase of operational amplifier IC1B and triode Q1, be connected with another resistance R 1 between the emitter of the end of oppisite phase of operational amplifier IC1B and triode Q2; Be connected with control capacittance Cf1 between the output of operational amplifier IC1B and the end of oppisite phase, the in-phase end of operational amplifier IC1B is connected with resistance R 3; Operational amplifier IC1A is connected power supply VCC and ground connection respectively separately with operational amplifier IC1B; R8, R5 and R2 connect interior voltage-stabilized power supply; Temperature-adjusting circuit adopts the double operational structure.
The circuit of driver unit comprises triode V1, crystal oscillator BC1, capacitor C t, capacitor C 3, capacitor C 4, the grounded emitter of triode V1, be connected with capacitor C 3 between the base stage of triode V1 and the emitter, be connected with capacitor C 4 between the collector electrode of triode V1 and the emitter, the base stage of triode V1 connects crystal oscillator BC1, crystal oscillator BC1 connects capacitor C t, and capacitor C t connects the collector electrode of triode.
Thermistor RT1 one end links to each other with ground, and two ends and be connected to filter capacitor C2.
Described sensitivity adjusting circuit comprises an adjustable resistance Rf, adjustable resistance Rf series connection tunable capacitor Cf2, adjustable resistance Rf tunable capacitor Cf3 in parallel with tunable capacitor Cf2.
Two resistance R 0 are connected filter capacitor C1 with the end that power supply VCC links to each other.
The temperature-adjusting circuit basic principle:
(1), temperature sampling: adopt the thermistor of medium B value, the temperature parameters signal of its induction is by the comparison circuit of track to track amplifier composition, and by suitable integral feedback is set, temperature parameters signal with fluctuation changes into sawtooth signal, imports the in-phase end of next utmost point amplifier.
(2), current sampling: by on the heating major loop, suitable current sense resistor being set, current signal is converted into sampling voltage, feed back to the end of oppisite phase of second level amplifier, after the monitoring temperature signal of this signal and in-phase end carries out dynamically comparing simultaneously, output one dynamic control voltage, thereby the effective operating state of control heating triode, thereby effectively controlled and added heat.Monitoring when this scheme is utilized physochlaina infudibularis amount and current parameter makes that the control of heating is meticulousr, more accurate.
Main vibration circuit:
Ke Er circuit form now debugged easily in employing, and the intrinsic characteristic of binding crystal itself simultaneously by rational inhibition circuit is set, allows good, the stable concussion of crystal on intrinsic frequency.
Below the utility model is described in detail, the above only is the preferred embodiment of the utility model, when not limiting the utility model practical range, be allly to do impartial change and modify, all should still belong in the utility model covering scope according to the application's scope.
Claims (4)
1. high-accuracy temperature control crystal oscillator, the circuit of this oscillator comprises the circuit of temperature-adjusting circuit and driver unit, it is characterized in that: temperature-adjusting circuit comprises the thermistor RT1 of a negative temperature coefficient, two operational amplifier IC1A, IC1B, two PNP triode Q1 and Q2; Thermistor RT1 one end ground connection, the other end connect temperature controlling point and regulate resistance R 8, and resistance R 8 other ends connect resistance R 5, and resistance R 5 connects resistance R 6, resistance R 6 other end ground connection; Pick out one the tunnel between resistance R 8 and the thermistor RT1 and be connected resistance R 9, the end of oppisite phase of resistance R 9 concatenation operation amplifier IC1A, the in-phase end of operational amplifier IC1A connects resistance R 7, and resistance R 7 other ends are connected between resistance R 5 and the resistance R 6; Cross-over connection has sensitivity adjusting circuit between the end of oppisite phase of operational amplifier IC1A and the output; The output of operational amplifier IC1A connects resistance R 4, the in-phase end of resistance R 4 concatenation operation amplifier IC1B, and the end of oppisite phase of operational amplifier IC1B connects resistance R 2; The output of operational amplifier IC1B connects the base stage of triode Q1, and triode Q1 connects the base stage of triode Q2; The emitter of triode Q1 connects power supply VCC by resistance R 0, and the emitter of triode Q2 connects power supply VCC, the grounded collector of triode Q1 and triode Q2 by another resistance R 0; Be connected with resistance R 1 between the emitter of the end of oppisite phase of operational amplifier IC1B and triode Q1, be connected with another resistance R 1 between the emitter of the end of oppisite phase of operational amplifier IC1B and triode Q2; Be connected with control capacittance Cf1 between the output of operational amplifier IC1B and the end of oppisite phase, the in-phase end of operational amplifier IC1B is connected with resistance R 3; Operational amplifier IC1A is connected power supply VCC and ground connection respectively separately with operational amplifier IC1B;
R8, R5 and R2 connect interior voltage-stabilized power supply;
The circuit of driver unit comprises triode V1, crystal oscillator BC1, capacitor C t, capacitor C 3, capacitor C 4, the grounded emitter of triode V1, be connected with capacitor C 3 between the base stage of triode V1 and the emitter, be connected with capacitor C 4 between the collector electrode of triode V1 and the emitter, the base stage of triode V1 connects crystal oscillator BC1, crystal oscillator BC1 connects capacitor C t, and capacitor C t connects the collector electrode of triode.
2. high-accuracy temperature control crystal oscillator according to claim 1 is characterized in that: thermistor RT1 one end links to each other with ground, and two ends and be connected to filter capacitor C2.
3. high-accuracy temperature control crystal oscillator according to claim 1 is characterized in that: described sensitivity adjusting circuit comprises an adjustable resistance Rf, adjustable resistance Rf series connection tunable capacitor Cf2, adjustable resistance Rf tunable capacitor Cf3 in parallel with tunable capacitor Cf2.
4. high-accuracy temperature control crystal oscillator according to claim 1 is characterized in that: temperature-adjusting circuit adopts the double operational structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020690846XU CN201904759U (en) | 2010-12-30 | 2010-12-30 | High-precision temperature control crystal oscillator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020690846XU CN201904759U (en) | 2010-12-30 | 2010-12-30 | High-precision temperature control crystal oscillator |
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| CN201904759U true CN201904759U (en) | 2011-07-20 |
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| CN201020690846XU Expired - Fee Related CN201904759U (en) | 2010-12-30 | 2010-12-30 | High-precision temperature control crystal oscillator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075142A (en) * | 2010-12-30 | 2011-05-25 | 东莞市金振电子有限公司 | High-precision temperature-controlled crystal oscillator |
| WO2017143623A1 (en) * | 2016-02-23 | 2017-08-31 | 广州时艺音响科技有限公司 | Control device for direct-current output potential of power amplifier |
| 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 |
-
2010
- 2010-12-30 CN CN201020690846XU patent/CN201904759U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075142A (en) * | 2010-12-30 | 2011-05-25 | 东莞市金振电子有限公司 | High-precision temperature-controlled crystal oscillator |
| WO2017143623A1 (en) * | 2016-02-23 | 2017-08-31 | 广州时艺音响科技有限公司 | Control device for direct-current output potential of power amplifier |
| 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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| 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: 20110720 Termination date: 20131230 |