CN204272042U - Be applied to the variable-gain FM circuit of wisdom handy service for the people platform terminal - Google Patents
Be applied to the variable-gain FM circuit of wisdom handy service for the people platform terminal Download PDFInfo
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- CN204272042U CN204272042U CN201420605239.7U CN201420605239U CN204272042U CN 204272042 U CN204272042 U CN 204272042U CN 201420605239 U CN201420605239 U CN 201420605239U CN 204272042 U CN204272042 U CN 204272042U
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Abstract
The utility model discloses a kind of variable-gain FM circuit being applied to wisdom handy service for the people platform terminal, comprise the variable-gain circuit be connected with signal input part and the Circuit tuning be connected with signal output part, the input of Circuit tuning is connected with the output of variable-gain circuit; Compared with prior art, the utility model changes the parameter of input signal by variable-gain circuit, and then the gain of described signal is adjusted, achieve the fine setting to signal amplification factor, the utility model changes the base bias of oscillistor by modulation signal thus the method for change interelectrode capacitance changes frequency, reduce impedance variation to the impact of oscillating circuit, this circuit is used can effectively to strengthen its anti-interference, frequency modulation process can be carried out to high-frequency signal, can be good at being suitable in multiple occasion.
Description
Technical field
The utility model relates to signal frequency modulation technology field, is specifically applied to the variable-gain FM circuit of wisdom handy service for the people platform terminal.
Background technology
Smart city is generation information technical support, Knowledge Society innovates urban morphology under 2.0 environment, smart city, by the application of the generation information such as Internet of Things, cloud computing technology and tool and methods such as dimension base, social networks, Fab Lab, Living Lab, Meta-Synthesis etc., realizes the application of ubiquitous interconnected, the Intelligent Fusion in the perception of thorough, broadband and the sustainable innovation that is feature with User Innovation, open innovation, popular innovation, collaborative innovation.The democratization process of the emergence of adjoint network kingdom, the fusion development of mobile technology and innovation, the advanced form of information city development after the Shi Ji digital city, smart city under Knowledge Society's environment; Wisdom handy service for the people platform is that a of our company's research and development has independent intellectual property right, tangible click interactive terminal product.The wisdom handy service for the people according to the different demands of all departments' construction, can be positioned at the convenience-for-people construction mode of wisdom integrally in terminal customization exploitation smart city, wisdom rural area, smart travel, intelligent medical treatment, Intelligent campus, wisdom government affairs, intelligence community seven.Make the wisdom terminal for public convenience of ground connection gas.Improve the handy service for the people experience with displaying, mode that is mutual, that pay, there is provided various convenience-for-people class service function such as: motor-car ticket to buy, prepaid mobile phone recharging, water power coal is paid the fees, lottery ticket is bought, flight inquiring, air ticket is ordered, hotel reservation, film ticket inquiry is bought, credit card repayment, bank transfer, gas filling card is supplemented with money.Wisdom terminal for public convenience is started operation at present, in Fuyang, each region every profession and trade sets up cooperative relationship widely, terminal is laid and is contained large-scale synthesis sales field, universities and colleges supermarket, Community Service Center etc., and company is preparing join the civil service government departments and institutions, high-end house, star hotel, chain-supermarket, high-grade office building, enterprise industrial park etc.
In the internal circuit component of wisdom handy service for the people platform terminal, FM circuit is a requisite ring in signal transacting link; Frequency modulation is exactly the frequency of high frequency carrier is not a constant, it is the modulation system changed within the specific limits with modulation signal, its amplitude is then a constant, corresponding with it, amplitude modulation is exactly the frequency of carrier frequency is constant, its amplitude becomes with modulation signal, always general interference signal is superimposed upon on signal, changes its amplitude.Although amplitude also can change so frequency-modulated wave is interfered, but with amplitude limiter, the change in signal amplitude can be pruned at receiving terminal, traditional FM circuit is lower to hyperfrequency carrier signal fm capacity, its anti-interference can be made after frequency is too high to reduce, there is the situation of distortion, and the amplifying circuit of at least two-stage generally all can be adopted directly to amplify signal to the amplification process of FM signal.And once after setting signal amplification factor, signal amplifier just uses a fixing multiplication factor, and multiplication factor is unadjustable.But when some need fine setting, this kind can not get best signal on the contrary to the amplification method of signal and finally causes the stability of the signal after amplifying to decline.
Utility model content
The purpose of this utility model is to provide a kind of variable-gain FM circuit being applied to wisdom handy service for the people platform terminal, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
Be applied to the variable-gain FM circuit of wisdom handy service for the people platform terminal, comprise the variable-gain circuit be connected with signal input part and the Circuit tuning be connected with signal output part, the input of Circuit tuning is connected with the output of variable-gain circuit; Described variable-gain circuit comprises resistance R2, field effect transistor VT, electric capacity C1 and resistance R1; The first end of described resistance R2 is connected with the first end of a resistance R3; Second end of described resistance R2 is connected with the drain electrode end of described field effect transistor VT; The first end of described electric capacity C1 is connected with the grid of described field effect transistor VT and the source electrode of described field effect transistor VT respectively with the second end; The first end of described resistance R1 is connected with the grid of described field effect transistor VT and the source electrode of described field effect transistor VT respectively with the second end; The source electrode of described field effect transistor VT is connected with second end of described resistance R3;
Described variable-gain amplifying circuit also comprises: control circuit, and described control circuit is connected with the grid of described field effect transistor VT, for controlling conducting and the disconnection of described field effect transistor VT; Described control circuit comprises control chip; Described control chip is connected with the grid of the field effect transistor VT of power supply, signal processor and described variable-gain amplifying circuit respectively;
Described Circuit tuning comprises resistance R4 ~ R10, electric capacity C2 ~ C9, inductance L 1 ~ L2, diode D1, triode Q1 ~ Q2, the first end of electric capacity C2 is signal input part and is connected with the tie point of resistance R2 and R3, second end of resistance R5 is connected with the positive pole of diode D1, the minus earth of diode D1, the emitter of triode Q1 respectively with the first end of resistance R6, the first end of electric capacity C3, be connected with the first end of resistance R7, the second end ground connection of electric capacity C4, the second end ground connection of resistance R6, the second end ground connection of electric capacity C3, second end of resistance R4 respectively with the first end of electric capacity C8, the first end of inductance L 2, the first end of inductance L 1 is connected with the first end of resistance R9, second end of inductance L 2 is connected with the collector electrode of triode Q1 and second end of electric capacity C4 respectively, second end of resistance R5 is connected with the first end of electric capacity C4, second end of electric capacity C4 respectively with the first end of resistance R8, second end of resistance R9 is connected with the base stage of triode Q2, the emitter of triode Q2 is connected with the first end of resistance R10 and the first end of electric capacity C5 respectively, the second end ground connection of resistance R10, the second end ground connection of electric capacity C5, the collector electrode of triode Q2 is connected with the first end of electric capacity C7 and the second end of inductance L 1 respectively, second end of described electric capacity C7 is connected with electric capacity C6 first end respectively, the second end ground connection of electric capacity C7, and second end of electric capacity C8 is signal output part.
Compared with prior art, the utility model by variable-gain circuit change input signal parameter, and then the gain of described signal is adjusted, achieve the fine setting to signal amplification factor, the utility model changes the base bias of oscillistor by modulation signal thus the method for change interelectrode capacitance changes frequency, reduce impedance variation to the impact of oscillating circuit, this circuit is used can effectively to strengthen its anti-interference, frequency modulation process can be carried out to high-frequency signal, can be good at being suitable in multiple occasion.
Accompanying drawing explanation
Fig. 1 is the structural representation that the utility model is applied to the variable-gain FM circuit of wisdom handy service for the people platform terminal.
Embodiment
Be described in more detail below in conjunction with the technical scheme of embodiment to this patent.
Refer to Fig. 1, be applied to the variable-gain FM circuit of wisdom handy service for the people platform terminal, comprise the variable-gain circuit be connected with signal input part and the Circuit tuning be connected with signal output part, the input of Circuit tuning is connected with the output of variable-gain circuit; Described variable-gain circuit comprises resistance R2, field effect transistor VT, electric capacity C1 and resistance R1; The first end of described resistance R2 is connected with the first end of a resistance R3; Second end of described resistance R2 is connected with the drain electrode end of described field effect transistor VT; The first end of described electric capacity C1 is connected with the grid of described field effect transistor VT and the source electrode of described field effect transistor VT respectively with the second end; The first end of described resistance R1 is connected with the grid of described field effect transistor VT and the source electrode of described field effect transistor VT respectively with the second end; The source electrode of described field effect transistor VT is connected with second end of described resistance R3; Described signal processor, by controlling the control chip of described control circuit, determines field effect transistor VT described in whether conducting.
Described variable-gain amplifying circuit further comprises: control circuit, and described control circuit is connected with the grid of described field effect transistor VT, for controlling conducting and the disconnection of described field effect transistor VT; Described control circuit comprises control chip; Described control chip is connected with the grid of the field effect transistor VT of power supply, signal processor and described variable-gain amplifying circuit respectively; When described field effect transistor VT does not have conducting, signal is by normal Product management model, and when needing to finely tune the multiplication factor of amplifying circuit, signal processor is by controlling field effect transistor VT described in described control chip conducting.Now, the feedback parameter of feedback circuit there occurs change.Described in non-conducting during field effect transistor VT, the multiplication factor β 1 of amplifying circuit is: β 1=(RX/R2+1), and RX is the resistance of R2 output signal end equivalence; When described field effect transistor VT conducting, described resistance R2 and resistance R3 defines parallel circuits, resistance after parallel connection is less than resistance R2 and resistance R3, multiplication factor is now: β 2=(RX/R2||R3+1) wherein, || represent in parallel, multiplication factor increases relative to the multiplication factor before the non-conducting of field effect transistor VT, achieves the fine setting to multiplication factor.
Described Circuit tuning comprises resistance R4 ~ R10, electric capacity C2 ~ C9, inductance L 1 ~ L2, diode D1, triode Q1 ~ Q2, the first end of electric capacity C2 is signal input part and is connected with the tie point of resistance R2 and R3, second end of resistance R5 is connected with the positive pole of diode D1, the minus earth of diode D1, the emitter of triode Q1 respectively with the first end of resistance R6, the first end of electric capacity C3, be connected with the first end of resistance R7, the second end ground connection of electric capacity C4, the second end ground connection of resistance R6, the second end ground connection of electric capacity C3, second end of resistance R4 respectively with the first end of electric capacity C8, the first end of inductance L 2, the first end of inductance L 1 is connected with the first end of resistance R9, second end of inductance L 2 is connected with the collector electrode of triode Q1 and second end of electric capacity C4 respectively, second end of resistance R5 is connected with the first end of electric capacity C4, second end of electric capacity C4 respectively with the first end of resistance R8, second end of resistance R9 is connected with the base stage of triode Q2, the emitter of triode Q2 is connected with the first end of resistance R10 and the first end of electric capacity C5 respectively, the second end ground connection of resistance R10, the second end ground connection of electric capacity C5, the collector electrode of triode Q2 is connected with the first end of electric capacity C7 and the second end of inductance L 1 respectively, second end of described electric capacity C7 is connected with electric capacity C6 first end respectively, the second end ground connection of electric capacity C7, and second end of electric capacity C8 is signal output part,
Circuit tuning is with the base bias of modulation signal change oscillistor thus the method for change interelectrode capacitance changes frequency, transmitting range is between 50 ~ 1OOm, in order to obtain larger frequency shift (FS), the capacity of electric capacity C3 and electric capacity C4 should be very little, the inductance value of inductance L 1 is that 0.3 μ about H is more suitable, because being subject to the impact of triode Q1 pole parasitic capacitance, air core coil should be adopted, and regulate tightness between line to obtain best inductance value, exported by triode Q2, reduce impedance variation to the impact of oscillating circuit.
Above the better embodiment of this patent is explained in detail, but this patent is not limited to above-mentioned execution mode, in the ken that one skilled in the relevant art possesses, various change can also be made under the prerequisite not departing from this patent aim.
Claims (2)
1. be applied to the variable-gain FM circuit of wisdom handy service for the people platform terminal, it is characterized in that, comprise the variable-gain circuit be connected with signal input part and the Circuit tuning be connected with signal output part, the input of Circuit tuning is connected with the output of variable-gain circuit, described variable-gain circuit comprises resistance R2, field effect transistor VT, electric capacity C1 and resistance R1, the first end of described resistance R2 is connected with the first end of a resistance R3, second end of described resistance R2 is connected with the drain electrode end of described field effect transistor VT, the first end of described electric capacity C1 is connected with the grid of described field effect transistor VT and the source electrode of described field effect transistor VT respectively with the second end, the first end of described resistance R1 is connected with the grid of described field effect transistor VT and the source electrode of described field effect transistor VT respectively with the second end, the source electrode of described field effect transistor VT is connected with second end of described resistance R3, described Circuit tuning comprises resistance R4 ~ R10, electric capacity C2 ~ C9, inductance L 1 ~ L2, diode D1, triode Q1 ~ Q2, the first end of electric capacity C2 is signal input part and is connected with the tie point of resistance R2 and R3, second end of resistance R5 is connected with the positive pole of diode D1, the minus earth of diode D1, the emitter of triode Q1 respectively with the first end of resistance R6, the first end of electric capacity C3, be connected with the first end of resistance R7, the second end ground connection of electric capacity C4, the second end ground connection of resistance R6, the second end ground connection of electric capacity C3, second end of resistance R4 respectively with the first end of electric capacity C8, the first end of inductance L 2, the first end of inductance L 1 is connected with the first end of resistance R9, second end of inductance L 2 is connected with the collector electrode of triode Q1 and second end of electric capacity C4 respectively, second end of resistance R5 is connected with the first end of electric capacity C4, second end of electric capacity C4 respectively with the first end of resistance R8, second end of resistance R9 is connected with the base stage of triode Q2, the emitter of triode Q2 is connected with the first end of resistance R10 and the first end of electric capacity C5 respectively, the second end ground connection of resistance R10, the second end ground connection of electric capacity C5, the collector electrode of triode Q2 is connected with the first end of electric capacity C7 and the second end of inductance L 1 respectively, second end of described electric capacity C7 is connected with electric capacity C6 first end respectively, the second end ground connection of electric capacity C7, and second end of electric capacity C8 is signal output part.
2. the variable-gain FM circuit being applied to wisdom handy service for the people platform terminal according to claim 1, is characterized in that, described variable-gain amplifying circuit also comprises: control circuit, and described control circuit is connected with the grid of described field effect transistor VT; Described control circuit comprises control chip; Described control chip is connected with the grid of the field effect transistor VT of power supply, signal processor and described variable-gain amplifying circuit respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420605239.7U CN204272042U (en) | 2014-10-20 | 2014-10-20 | Be applied to the variable-gain FM circuit of wisdom handy service for the people platform terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420605239.7U CN204272042U (en) | 2014-10-20 | 2014-10-20 | Be applied to the variable-gain FM circuit of wisdom handy service for the people platform terminal |
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| CN204272042U true CN204272042U (en) | 2015-04-15 |
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| CN201420605239.7U Expired - Fee Related CN204272042U (en) | 2014-10-20 | 2014-10-20 | Be applied to the variable-gain FM circuit of wisdom handy service for the people platform terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849884A (en) * | 2017-02-22 | 2017-06-13 | 成都芯源系统有限公司 | Signal amplification system and Hall detection amplification system thereof |
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2014
- 2014-10-20 CN CN201420605239.7U patent/CN204272042U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849884A (en) * | 2017-02-22 | 2017-06-13 | 成都芯源系统有限公司 | Signal amplification system and Hall detection amplification system thereof |
| CN106849884B (en) * | 2017-02-22 | 2020-07-14 | 成都芯源系统有限公司 | Signal amplification system and Hall detection amplification system thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150415 Termination date: 20151020 |
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| EXPY | Termination of patent right or utility model |