CN202872729U - Voltage controlled oscillator voltage compensation circuit and frequency modulation signal emitter circuit - Google Patents
Voltage controlled oscillator voltage compensation circuit and frequency modulation signal emitter circuit Download PDFInfo
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- CN202872729U CN202872729U CN 201220486485 CN201220486485U CN202872729U CN 202872729 U CN202872729 U CN 202872729U CN 201220486485 CN201220486485 CN 201220486485 CN 201220486485 U CN201220486485 U CN 201220486485U CN 202872729 U CN202872729 U CN 202872729U
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Abstract
The utility model belongs to the field of circuits, and provides a voltage controlled oscillator voltage compensation circuit and a frequency modulation signal emitter circuit. A precise reference work voltage is provided for the voltage controlled oscillator voltage compensation circuit through a precise reference voltage stabilizing diode, resistance of a voltage regulation module is controlled to vary as temperature changes, voltage at a voltage output end of the voltage regulation module is further controlled to vary as temperature changes, a voltage that varies as the temperature varies is output to the voltage controlled oscillator for voltage compensation, so that the voltage controlled oscillator can maintain stable output frequency when the temperature changes. As a result, problems that the voltage controlled oscillator has large changes in frequency when the temperature varies under control of a fixed work voltage, the debugging is difficult, and device parameters are inconsistent are solved.
Description
Technical field
The utility model belongs to circuit field, relates in particular to a kind of voltage-controlled oscillator voltage compensating circuit and FM transmitter circuit.
Background technology
Voltage controlled oscillator (VCO) is very common part in wireless system and communication system.Present very ripe and extensive use of monolithic semiconductor VCO integrated circuit based on variable capacitance diode.
But because semiconductor material characteristic determines that the temperature characterisitic of monolithic semiconductor VCO integrated circuit is relatively poor.Such as an oscillator that is set as 100MHz, under the steady job voltage control, be raised to 100 ℃ from 25 ℃ when temperature, frequency may be down to 98.5MHz from 100.00MHz, change to reach 1.5%, and its variation is nonlinear.For operational environment is relatively harsher, the serviceability temperature scope is wider, require the little system of frequency change, the designer has to try every means and compensates, but because the discreteness of device parameters and the difference of fabric swatch, so that compensation effect is often also unsatisfactory, or debugging is very difficult, and the device parameters consistency is poor.
The utility model content
The utility model provides a kind of voltage-controlled oscillator voltage compensating circuit, and it is unstable to be intended to solve in the prior art voltage controlled oscillator temperature influence situation lower frequency, and change larger, debug difficulties, the problem such as the device parameters consistency is poor.
In order to address the above problem, the utility model is achieved in that a kind of voltage-controlled oscillator voltage compensating circuit, be connected with power supply with voltage controlled oscillator respectively, described voltage controlled oscillator comprises operating voltage input, bucking voltage input and earth terminal, and described voltage-controlled oscillator voltage compensating circuit comprises:
First end is connected with described power supply, and the current-limiting resistance R1 of overcurrent protection is provided for described voltage-controlled oscillator voltage compensating circuit;
Negative pole is connected with the second end of described current-limiting resistance R1, and plus earth provides the accurate voltage-reference diode DZ1 of the operating voltage of accurate benchmark for described voltage-controlled oscillator voltage compensating circuit and voltage controlled oscillator; And
The input described current-limiting resistance R1 of termination and the public connecting end of described accurate voltage-reference diode DZ1 and the operating voltage input of described voltage controlled oscillator, the earth terminal of earth terminal and described voltage controlled oscillator is connected to ground altogether, the bucking voltage input of the described voltage controlled oscillator of Voltage-output termination is exported a voltage that varies with temperature and change to the control Voltage Regulator Module of the bucking voltage input of described voltage controlled oscillator.
Further, described control Voltage Regulator Module comprises: thermistor RT1, thermistor RT2, thick-film resistor R2, thick-film resistor R3, thick-film resistor R4 and thick-film resistor R5;
The first end of described thermistor RT1 is the input of described control Voltage Regulator Module, the first end of the described thick-film resistor R2 of the second termination of described thermistor RT1, the first end of the described thermistor RT1 of the first termination of described thick-film resistor R3, the second end of described thick-film resistor R3 and the second end of described thick-film resistor R2 are connected to the first end of described thermistor RT2 and the first end of described thick-film resistor R5 altogether, the public connecting end of described thick-film resistor R2 and described thick-film resistor R3 is the voltage output end of described control Voltage Regulator Module, the first end of the described thick-film resistor R4 of the second termination of described thermistor RT2, second of described thick-film resistor R5 is terminated at the second end of described thick-film resistor R4, and the public connecting end of described thick-film resistor R5 and described thick-film resistor R4 is the earth terminal of described control Voltage Regulator Module.
Further, described thermistor RT1 and described thermistor RT2 are respectively negative tempperature coefficient thermistor.
The utility model also provides a kind of FM transmitter circuit, be connected with audio signal source, comprise voltage controlled oscillator and the frequency modulation signal emitting module that is connected with described voltage controlled oscillator, described voltage controlled oscillator comprises operating voltage input, bucking voltage input, earth terminal, signal input part and signal output part, the operating voltage input of described voltage controlled oscillator and signal input part are same end, and described FM transmitter circuit also comprises:
The signal input part of the described voltage controlled oscillator of the first termination, the filter capacitor C1 that the second end is connected with audio signal source; With
Be connected with the signal input part of described voltage controlled oscillator, control the voltage-controlled oscillator voltage compensating circuit of described voltage controlled oscillator frequency stabilization work.
Further, described voltage-controlled oscillator voltage compensating circuit comprises: first end is connected with described power supply, and the current-limiting resistance R1 of overcurrent protection is provided for described voltage-controlled oscillator voltage compensating circuit;
Negative pole is connected with the second end of described current-limiting resistance R1, and plus earth provides the accurate voltage-reference diode DZ1 of the operating voltage of accurate benchmark for described voltage-controlled oscillator voltage compensating circuit and voltage controlled oscillator; And
The input described current-limiting resistance R1 of termination and the public connecting end of described accurate voltage-reference diode DZ1 and the operating voltage input of described voltage controlled oscillator, the earth terminal of earth terminal and described voltage controlled oscillator is connected to ground altogether, the bucking voltage input of the described voltage controlled oscillator of Voltage-output termination is exported a voltage that varies with temperature and change to the control Voltage Regulator Module of the bucking voltage input of described voltage controlled oscillator.
Further, described control Voltage Regulator Module comprises: thermistor RT1, thermistor RT2, thick-film resistor R2, thick-film resistor R3, thick-film resistor R4 and thick-film resistor R5;
The first end of described thermistor RT1 is the input of described control Voltage Regulator Module, the first end of the described thick-film resistor R2 of the second termination of described thermistor RT1, the first end of the described thermistor RT1 of the first termination of described thick-film resistor R3, the second end of described thick-film resistor R3 and the second end of described thick-film resistor R2 are connected to the first end of described thermistor RT2 and the first end of described thick-film resistor R5 altogether, the public connecting end of described thick-film resistor R2 and described thick-film resistor R3 is the voltage output end of described control Voltage Regulator Module, the first end of the described thick-film resistor R4 of the second termination of described thermistor RT2, second of described thick-film resistor R5 is terminated at the second end of described thick-film resistor R4, and the public connecting end of described thick-film resistor R5 and described thick-film resistor R4 is the earth terminal of described control Voltage Regulator Module.
Further, described thermistor RT1 and described thermistor RT2 are respectively negative tempperature coefficient thermistor.
In the utility model, the operating voltage of an accurate benchmark is provided to the voltage-controlled oscillator voltage compensating circuit by accurate voltage-reference diode, the resistance of control Voltage Regulator Module varies with temperature and changes, and then the voltage of the voltage output end of control Voltage Regulator Module is also changed with temperature, export a temperature variant voltage and carry out voltage compensation to voltage controlled oscillator, make voltage controlled oscillator when temperature changes, also can keep stable output frequency, it is large to have solved voltage controlled oscillator frequency change when variations in temperature under the steady job voltage control, debug difficulties, the inconsistent problem of device parameters.
Description of drawings
Fig. 1 is the modular structure figure of the voltage-controlled oscillator voltage compensating circuit that provides among the utility model embodiment;
Fig. 2 is the circuit structure diagram of the voltage-controlled oscillator voltage compensating circuit that provides among the utility model embodiment;
Fig. 3 is the circuit structure diagram of the FM transmitter circuit that provides among the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
Below in conjunction with specific embodiment specific implementation of the present utility model is described in detail:
As shown in Figure 1, voltage-controlled oscillator voltage compensating circuit 200 is connected with power supply with voltage controlled oscillator 300 respectively and is connected, and voltage controlled oscillator 300 comprises operating voltage input, bucking voltage input and earth terminal, and voltage-controlled oscillator voltage compensating circuit 200 comprises:
First end is connected with power supply 100, and the current-limiting resistance R1 of overcurrent protection is provided for voltage-controlled oscillator voltage compensating circuit 200;
Negative pole is connected with the second end of current-limiting resistance R1, and plus earth provides the accurate voltage-reference diode DZ1 of the operating voltage of accurate benchmark for voltage-controlled oscillator voltage compensating circuit 200 and voltage controlled oscillator 300; And
Input termination current-limiting resistance R1 and the public connecting end of accurate voltage-reference diode DZ1 and the operating voltage input of voltage controlled oscillator, the earth terminal of earth terminal and voltage controlled oscillator 300 is connected to ground altogether, the bucking voltage input of Voltage-output termination voltage controlled oscillator 300 is exported a voltage that varies with temperature and change to the control Voltage Regulator Module 200 of voltage controlled oscillator 300.
Further, as shown in Figure 2, control Voltage Regulator Module 102 comprises: thermistor RT1, thermistor RT2, thick-film resistor R2, thick-film resistor R3, thick-film resistor R4 and thick-film resistor R5;
Thermistor RT1 first end is the input of control Voltage Regulator Module 102, the first end of the second termination thick-film resistor R2 of thermistor RT1, the first end of the first termination thermistor RT1 of thick-film resistor R3, the second end of thick-film resistor R3 and the second end of thick-film resistor R2 are connected to the first end of thermistor RT2 and the first end of thick-film resistor R5 altogether, the public connecting end of thick-film resistor R2 and thick-film resistor R3 is the voltage output end of control Voltage Regulator Module 102, the first end of the second termination thick-film resistor R4 of thermistor RT2, second of thick-film resistor R5 is terminated at the second end of thick-film resistor R4, and the public connecting end of described thick-film resistor R5 and thick-film resistor R4 is the earth terminal of control Voltage Regulator Module 102.
Further, thermistor RT1 and thermistor RT2 are respectively negative tempperature coefficient thermistor.
As the utility model one embodiment, the temperature coefficient of thick-film resistor R2, thick-film resistor R3, thick-film resistor R4 and thick-film resistor R5 is generally in tens PPM scopes.
Describe below in conjunction with the realization principle of present embodiment to the voltage-controlled oscillator voltage compensating circuit:
Power supply 101 provides an operating voltage for voltage-controlled oscillator voltage compensating circuit 100 and voltage controlled oscillator 200, accurate voltage-reference diode DZ1 is after energising, the reference voltage of an accurate benchmark is provided for voltage-controlled oscillator voltage compensating circuit 100, make circuit working more stable, thermistor RT1 and thermistor RT2 are the adjustable negative tempperature coefficient thermistor of coefficient, after energising, its resistance temperature influence is larger, after thermistor RT1 and thermistor RT2 resistance are determined, thick-film resistor R2 and thick-film resistor R4 have respectively the effect that reduces thermistor RT1 coefficient and thermistor RT2 coefficient, thermistor RT1 and thermistor RT2 are respectively with after thick-film resistor R3 and thick-film resistor R4 are in parallel, formation is to the dividing potential drop of reference voltage, by the output of control Voltage Regulator Module 102 voltage output ends, compacting oscillator 200 is carried out voltage compensation, offer 200 1 temperature variant voltages of voltage controlled oscillator, and then make output frequency keep stable.
In the utility model embodiment, the voltage-controlled oscillator voltage compensating circuit can be used as FM transmitter, in the voltage-controlled oscillator voltage compensating circuit, the frequency of voltage controlled oscillator stable output can make the signal of generation more stable, better effects if.
As shown in Figure 3, the utility model also provides a kind of FM transmitter circuit, be connected with audio signal source 400, comprise voltage controlled oscillator 300 and the frequency modulation signal emitting module 500 that is connected with voltage controlled oscillator 300, voltage controlled oscillator 300 comprises operating voltage input, bucking voltage input, earth terminal, signal input part and signal output part, the operating voltage input of voltage controlled oscillator 300 and signal input part are same end, and the FM transmitter circuit also comprises:
First end is connected with the signal input part of voltage controlled oscillator 300, the filter capacitor C1 that the second end is connected with audio signal source 400; With
Be connected the voltage-controlled oscillator voltage compensating circuit 200 of control voltage controlled oscillator 300 frequency stabilization work with the signal input part of voltage controlled oscillator 300.
Further, as shown in Figure 2, the voltage-controlled oscillator voltage compensating circuit comprises: first end is connected with power supply 100, and the current-limiting resistance R1 of overcurrent protection is provided for voltage-controlled oscillator voltage compensating circuit 200; Negative pole is connected with the second end of current-limiting resistance R1, and plus earth provides the accurate voltage-reference diode DZ1 of the operating voltage of accurate benchmark for voltage-controlled oscillator voltage compensating circuit 200 and voltage controlled oscillator 300; And
Input termination current-limiting resistance R1 and the public connecting end of accurate voltage-reference diode DZ1 and the operating voltage input of voltage controlled oscillator 300, the earth terminal of earth terminal and voltage controlled oscillator 300 is connected to ground altogether, the bucking voltage input of Voltage-output termination voltage controlled oscillator 300 is exported a voltage that varies with temperature and change to the control Voltage Regulator Module 201 of described voltage controlled oscillator 300.
Further, control Voltage Regulator Module 201 comprises: thermistor RT1, thermistor RT2, thick-film resistor R2, thick-film resistor R3, thick-film resistor R4 and thick-film resistor R5;
The first end of thermistor RT1 is the input of control Voltage Regulator Module 201, the first end of the described thick-film resistor R2 of the second termination of thermistor RT1, the first end of the first termination thermistor RT1 of thick-film resistor R3, the second end of thick-film resistor R3 and the second end of thick-film resistor R2 are connected to the first end of thermistor RT2 and the first end of thick-film resistor R5 altogether, the public connecting end of thick-film resistor R2 and thick-film resistor R3 is the voltage output end of control Voltage Regulator Module 201, the first end of the second termination thick-film resistor R4 of thermistor RT2, second of thick-film resistor R5 is terminated at the second end of thick-film resistor R4, and the public connecting end of thick-film resistor R5 and thick-film resistor R4 is the earth terminal of control Voltage Regulator Module 201.
Further, thermistor RT1 and described thermistor RT2 are respectively negative tempperature coefficient thermistor.
In the utility model embodiment, the circuit structure of the control Voltage Regulator Module 201 that provides only is the utility model optimum implementation, can also have other to realize the module of identical function.
In the utility model embodiment, can also adopt the good AI of heat conductivility
2O
3Pottery as substrate, thick-film resistor R2-R5 adopts the technique of typography sintering on ceramic substrate.The high-termal conductivity of ceramic substrate is in voltage controlled oscillator 200 and voltage-controlled oscillator voltage compensating circuit 100 on the isothermal gradient in a basic balance, makes compensation effect more perfect.
In the utility model embodiment, the voltage of an accurate benchmark is provided to the voltage-controlled oscillator voltage compensating circuit by accurate voltage-reference diode, according to variations in temperature thermistor had larger impact, and then the resistance of change control Voltage Regulator Module, the voltage of the voltage output end of control Voltage Regulator Module is changed with temperature, export a temperature variant voltage and carry out voltage compensation to voltage controlled oscillator, make voltage controlled oscillator when temperature changes, also can keep stable output frequency, solved voltage controlled oscillator under the steady job voltage control during variations in temperature frequency change large, debug difficulties, the inconsistent problem of device parameters.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (7)
1. a voltage-controlled oscillator voltage compensating circuit is connected with power supply with voltage controlled oscillator respectively, and described voltage controlled oscillator comprises operating voltage input, bucking voltage input and earth terminal, it is characterized in that, described voltage-controlled oscillator voltage compensating circuit comprises:
First end is connected with described power supply, and the current-limiting resistance R1 of overcurrent protection is provided for described voltage-controlled oscillator voltage compensating circuit;
Negative pole is connected with the second end of described current-limiting resistance R1, and plus earth provides the accurate voltage-reference diode DZ1 of the operating voltage of accurate benchmark for described voltage-controlled oscillator voltage compensating circuit and voltage controlled oscillator; And
The input described current-limiting resistance R1 of termination and the public connecting end of described accurate voltage-reference diode DZ1 and the operating voltage input of described voltage controlled oscillator, the earth terminal of earth terminal and described voltage controlled oscillator is connected to ground altogether, the bucking voltage input of the described voltage controlled oscillator of Voltage-output termination is exported a voltage that varies with temperature and change to the control Voltage Regulator Module of described voltage controlled oscillator.
2. voltage-controlled oscillator voltage compensating circuit as claimed in claim 1 is characterized in that, described control Voltage Regulator Module comprises:
Thermistor RT1, thermistor RT2, thick-film resistor R2, thick-film resistor R3, thick-film resistor R4 and thick-film resistor R5;
The first end of described thermistor RT1 is the input of described control Voltage Regulator Module, the first end of the described thick-film resistor R2 of the second termination of described thermistor RT1, the first end of the described thermistor RT1 of the first termination of described thick-film resistor R3, the second end of described thick-film resistor R3 and the second end of described thick-film resistor R2 are connected to the first end of described thermistor RT2 and the first end of described thick-film resistor R5 altogether, the public connecting end of described thick-film resistor R2 and described thick-film resistor R3 is the voltage output end of described control Voltage Regulator Module, the first end of the described thick-film resistor R4 of the second termination of described thermistor RT2, second of described thick-film resistor R5 is terminated at the second end of described thick-film resistor R4, and the public connecting end of described thick-film resistor R5 and described thick-film resistor R4 is the earth terminal of described control Voltage Regulator Module.
3. voltage-controlled oscillator voltage compensating circuit as claimed in claim 2 is characterized in that, described thermistor RT1 and described thermistor RT2 are respectively negative tempperature coefficient thermistor.
4. FM transmitter circuit, be connected with audio signal source, comprise voltage controlled oscillator and the frequency modulation signal emitting module that is connected with described voltage controlled oscillator, described voltage controlled oscillator comprises operating voltage input, bucking voltage input, earth terminal, signal input part and signal output part, the operating voltage input of described voltage controlled oscillator and signal input part are same end, it is characterized in that described FM transmitter circuit also comprises:
First end is connected with the signal input part of described voltage controlled oscillator, the filter capacitor C1 that the second end is connected with audio signal source; With
Be connected with the signal input part of described voltage controlled oscillator, control the voltage-controlled oscillator voltage compensating circuit of described voltage controlled oscillator frequency stabilization work.
5. FM transmitter circuit as claimed in claim 4 is characterized in that, described voltage-controlled oscillator voltage compensating circuit comprises:
First end is connected with described power supply, and the current-limiting resistance R1 of overcurrent protection is provided for described voltage-controlled oscillator voltage compensating circuit;
Negative pole is connected with the second end of described current-limiting resistance R1, and plus earth provides the accurate voltage-reference diode DZ1 of the operating voltage of accurate benchmark for described voltage-controlled oscillator voltage compensating circuit and voltage controlled oscillator; And
The input described current-limiting resistance R1 of termination and the public connecting end of described accurate voltage-reference diode DZ1 and the operating voltage input of described voltage controlled oscillator, the earth terminal of earth terminal and described voltage controlled oscillator is connected to ground altogether, the bucking voltage input of the described voltage controlled oscillator of Voltage-output termination is exported a voltage that varies with temperature and change to the control Voltage Regulator Module of described voltage controlled oscillator.
6. FM transmitter circuit as claimed in claim 4 is characterized in that, described control Voltage Regulator Module comprises:
Thermistor RT1, thermistor RT2, thick-film resistor R2, thick-film resistor R3, thick-film resistor R4 and thick-film resistor R5;
The first end of described thermistor RT1 is the input of described control Voltage Regulator Module, the first end of the described thick-film resistor R2 of the second termination of described thermistor RT1, the first end of the described thermistor RT1 of the first termination of described thick-film resistor R3, the second end of described thick-film resistor R3 and the second end of described thick-film resistor R2 are connected to the first end of described thermistor RT2 and the first end of described thick-film resistor R5 altogether, the public connecting end of described thick-film resistor R2 and described thick-film resistor R3 is the voltage output end of described control Voltage Regulator Module, the first end of the described thick-film resistor R4 of the second termination of described thermistor RT2, second of described thick-film resistor R5 is terminated at the second end of described thick-film resistor R4, and the public connecting end of described thick-film resistor R5 and described thick-film resistor R4 is the earth terminal of described control Voltage Regulator Module.
7. FM transmitter circuit as claimed in claim 4 is characterized in that, described thermistor RT1 and described thermistor RT2 are respectively negative tempperature coefficient thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220486485 CN202872729U (en) | 2012-09-21 | 2012-09-21 | Voltage controlled oscillator voltage compensation circuit and frequency modulation signal emitter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220486485 CN202872729U (en) | 2012-09-21 | 2012-09-21 | Voltage controlled oscillator voltage compensation circuit and frequency modulation signal emitter circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202872729U true CN202872729U (en) | 2013-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220486485 Expired - Fee Related CN202872729U (en) | 2012-09-21 | 2012-09-21 | Voltage controlled oscillator voltage compensation circuit and frequency modulation signal emitter circuit |
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| CN (1) | CN202872729U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103684257A (en) * | 2012-09-21 | 2014-03-26 | 深圳市振华微电子有限公司 | Voltage-controlled oscillator voltage compensation circuit |
| CN115133939A (en) * | 2021-03-24 | 2022-09-30 | 海能达通信股份有限公司 | Transmitter and communication device |
-
2012
- 2012-09-21 CN CN 201220486485 patent/CN202872729U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103684257A (en) * | 2012-09-21 | 2014-03-26 | 深圳市振华微电子有限公司 | Voltage-controlled oscillator voltage compensation circuit |
| CN103684257B (en) * | 2012-09-21 | 2016-09-14 | 深圳市振华微电子有限公司 | A kind of voltage-controlled oscillator voltage compensates circuit |
| CN115133939A (en) * | 2021-03-24 | 2022-09-30 | 海能达通信股份有限公司 | Transmitter and communication device |
| CN115133939B (en) * | 2021-03-24 | 2023-12-12 | 海能达通信股份有限公司 | Transmitter and communication device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130410 Termination date: 20190921 |