CN204316466U - A kind of stable wide band filter - Google Patents
A kind of stable wide band filter Download PDFInfo
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- CN204316466U CN204316466U CN201420740340.3U CN201420740340U CN204316466U CN 204316466 U CN204316466 U CN 204316466U CN 201420740340 U CN201420740340 U CN 201420740340U CN 204316466 U CN204316466 U CN 204316466U
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Abstract
The utility model discloses a kind of stable wide band filter, mainly comprise FM circuit, the trimming circuit be all connected with FM circuit and feedback circuit, is characterized in that: also comprise the linear drive circuit be simultaneously connected with trimming circuit and feedback circuit with FM circuit; Described linear drive circuit is by driving chip U, triode VT1, triode VT2, triode VT3, triode VT4, the polar capacitor C4 that positive pole is connected with FM circuit, negative pole is connected with the IN1 pin of driving chip U after resistance R9, the compositions such as the resistance R10 that one end is connected with the collector electrode of triode VT1, the other end is connected with the base stage of triode VT3 after resistance R11.The utility model is provided with linear drive circuit, and it can make filter more stable when processing broadband signal.
Description
Technical field
The utility model relates to a kind of electronic device, specifically refers to a kind of stable wide band filter.
Background technology
Along with the development of electronic market, filter is also more and more widely used the device that signal plays process effect as a kind of, such as, all need to use filter in fields such as medical treatment, industrial production.But at present the filter of commercial type stability bad when processing broadband signal, which greatly limits the working range of filter.The problems referred to above how are avoided to be then that people are badly in need of solving.
Utility model content
The purpose of this utility model is to overcome the existing filter filtering device defect that stability is bad when processing broadband signal, provides a kind of stable wide band filter.
The purpose of this utility model is achieved through the following technical solutions: a kind of stable wide band filter, mainly comprise FM circuit, the trimming circuit be all connected with FM circuit and feedback circuit, also comprise the linear drive circuit be simultaneously connected with trimming circuit and feedback circuit with FM circuit, described linear drive circuit is by driving chip U, triode VT1, triode VT2, triode VT3, triode VT4, positive pole is connected with FM circuit, the polar capacitor C4 that negative pole is connected with the IN1 pin of driving chip U after resistance R9, one end is connected with the collector electrode of triode VT1, the resistance R10 that the other end is connected with the base stage of triode VT3 after resistance R11, positive pole is connected with the base stage of triode VT1, the polar capacitor C6 that negative pole is connected with the IN1 pin of driving chip U, positive pole is connected with the IN2 pin of driving chip U, the polar capacitor C5 of minus earth, one end is connected with the emitter of triode VT1, the resistance R13 that the other end is connected with the base stage of triode VT2, one end is connected with the base stage of triode VT2, the resistance R12 that the other end is connected with the base stage of triode VT3, N pole is connected with the collector electrode of triode VT1, the diode D1 that P pole is connected with the collector electrode of triode VT2, positive terminal is connected with the collector electrode of triode VT1, the not gate K that end of oppisite phase is connected with triode VT4 collector electrode, one end is connected with triode VT4 emitter, the resistance R15 that the other end is connected with the emitter of triode VT3 after resistance R14, the end of oppisite phase of P pole NAND gate K is connected, the diode D2 that N pole is connected with the tie point of resistance R14 with resistance R15 forms, the VCC pin of described driving chip U is connected with the base stage of triode VT1, END pin ground connection, OUT pin are connected with the collector electrode of triode VT2, the collector electrode of triode VT2 is also connected with the base stage of triode VT4, its emitter is connected with the base stage of triode man VT3, the grounded collector of triode VT3, the N pole of diode D2 is connected with trimming circuit and feedback circuit simultaneously.
Described FM circuit is by resistance R1, and resistance R2, resistance R3, polar capacitor C1, polar capacitor C2, polar capacitor C3 and potentiometer R4 form; The positive pole of polar capacitor C1 is connected with its negative pole in turn after resistance R1, resistance R2, potentiometer R4 and polar capacitor C3, resistance R3 and potentiometer R4 is in parallel, and the positive pole of polar capacitor C2 is connected with the tie point of resistance R2 with resistance R1, negative pole is then connected with the positive pole of electric capacity C4; The control end of described potentiometer R4 is connected with the negative pole of polar capacitor C3, and the negative pole of polar capacitor C3 is also connected with feedback circuit, its positive pole is then connected with trimming circuit.
Described trimming circuit comprises resistance R7, potentiometer R8; One end of resistance R7 is connected with the negative pole of polar capacitor C1, the other end is then connected with the N pole of diode D2 after potentiometer R8, and the control end of potentiometer R8 is connected with the N pole of diode D2.
Described feedback circuit by operational amplifier P1, operational amplifier P2, one end is connected with the output stage of operational amplifier P2, other end resistance R5 of ground connection after potentiometer R6 forms; The negative pole of described amplifier P2 is connected with its output stage, positive pole is then connected with the tie point of potentiometer R4 with polar capacitor C3, and the output stage of amplifier P1 is extremely connected with the N of diode D2, negative pole is connected with its output stage, positive pole is then connected with the control end of potentiometer R6.
Described driving chip U is LM387 integrated chip.
The utility model comparatively prior art is compared, and has the following advantages and beneficial effect:
(1) the utility model is provided with linear drive circuit, and it can make filter more stable when processing broadband signal.
(2) the utility model is provided with FM circuit, then can be changed the scope of filter process frequency by the polar capacitor C2 in Circuit tuning and polar capacitor C3, thus realizes the wideband process of filter, is applicable to close kind of a different occasion.
(3) the utility model adopts LM387 chip as driving chip, its highly sensitive, low price.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present utility model.
Fig. 2 is the structural representation of the utility model linear drive circuit.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail, but execution mode of the present utility model is not limited to this.
Embodiment
As shown in Figure 1, the wide band filter that the utility model is stable, mainly comprises FM circuit, the trimming circuit be all connected with FM circuit and feedback circuit, also comprises the linear drive circuit be simultaneously connected with trimming circuit and feedback circuit with FM circuit.
As shown in Figure 2, described linear drive circuit is by driving chip U, triode VT1, triode VT2, triode VT3, triode VT4, positive pole is connected with FM circuit, the polar capacitor C4 that negative pole is connected with the IN1 pin of driving chip U after resistance R9, one end is connected with the collector electrode of triode VT1, the resistance R10 that the other end is connected with the base stage of triode VT3 after resistance R11, positive pole is connected with the base stage of triode VT1, the polar capacitor C6 that negative pole is connected with the IN1 pin of driving chip U, positive pole is connected with the IN2 pin of driving chip U, the polar capacitor C5 of minus earth, one end is connected with the emitter of triode VT1, the resistance R13 that the other end is connected with the base stage of triode VT2, one end is connected with the base stage of triode VT2, the resistance R12 that the other end is connected with the base stage of triode VT3, N pole is connected with the collector electrode of triode VT1, the diode D1 that P pole is connected with the collector electrode of triode VT2, positive terminal is connected with the collector electrode of triode VT1, the not gate K that end of oppisite phase is connected with triode VT4 collector electrode, one end is connected with triode VT4 emitter, the resistance R15 that the other end is connected with the emitter of triode VT3 after resistance R14, the end of oppisite phase of P pole NAND gate K is connected, the diode D2 that N pole is connected with the tie point of resistance R14 with resistance R15 forms, the VCC pin of described driving chip U is connected with the base stage of triode VT1, END pin ground connection, OUT pin are connected with the collector electrode of triode VT2, the collector electrode of triode VT2 is also connected with the base stage of triode VT4, its emitter is connected with the base stage of triode man VT3, the grounded collector of triode VT3, the N pole of diode D2 is connected with trimming circuit and feedback circuit simultaneously.Linear drive circuit, it can make filter more stable when processing broadband signal.In order to ensure implementation result, described driving chip U is preferably LM387 integrated chip, its highly sensitive and low price.
The scope of filter process frequency can be changed by this FM circuit.It is by resistance R1, resistance R2, resistance R3, polar capacitor C1, polar capacitor C2, and polar capacitor C3 and potentiometer R4 forms; The positive pole of polar capacitor C1 is connected with its negative pole in turn after resistance R1, resistance R2, potentiometer R4 and polar capacitor C3, resistance R3 and potentiometer R4 is in parallel, and the positive pole of polar capacitor C2 is connected with the tie point of resistance R2 with resistance R1, negative pole is then connected with the positive pole of electric capacity C4; The control end of described potentiometer R4 is connected with the negative pole of polar capacitor C3, and the negative pole of polar capacitor C3 is also connected with feedback circuit, its positive pole is then connected with trimming circuit.During work, as long as the polar capacitor amount of adjustment polar capacitor C2 and polar capacitor C3 just can realize the filter range changing filter.
Described trimming circuit comprises resistance R7, potentiometer R8; One end of resistance R7 is connected with the negative pole of polar capacitor C1, the other end is then connected with the N pole of diode D2 after potentiometer R8, and the control end of potentiometer R8 is connected with the N pole of diode D2.
Described feedback circuit by operational amplifier P1, operational amplifier P2, one end is connected with the output stage of operational amplifier P2, other end resistance R5 of ground connection after potentiometer R6 forms; The negative pole of described amplifier P2 is connected with its output stage, positive pole is then connected with the tie point of potentiometer R4 with polar capacitor C3, and the output stage of amplifier P1 is extremely connected with the N of diode D2, negative pole is connected with its output stage, positive pole is then connected with the control end of potentiometer R6.
As mentioned above, just well the utility model can be implemented.
Claims (5)
1. a stable wide band filter, mainly comprises FM circuit, and the trimming circuit be all connected with FM circuit and feedback circuit, is characterized in that: also comprise the linear drive circuit be simultaneously connected with trimming circuit and feedback circuit with FM circuit, described linear drive circuit is by driving chip U, triode VT1, triode VT2, triode VT3, triode VT4, positive pole is connected with FM circuit, the polar capacitor C4 that negative pole is connected with the IN1 pin of driving chip U after resistance R9, one end is connected with the collector electrode of triode VT1, the resistance R10 that the other end is connected with the base stage of triode VT3 after resistance R11, positive pole is connected with the base stage of triode VT1, the polar capacitor C6 that negative pole is connected with the IN1 pin of driving chip U, positive pole is connected with the IN2 pin of driving chip U, the polar capacitor C5 of minus earth, one end is connected with the emitter of triode VT1, the resistance R13 that the other end is connected with the base stage of triode VT2, one end is connected with the base stage of triode VT2, the resistance R12 that the other end is connected with the base stage of triode VT3, N pole is connected with the collector electrode of triode VT1, the diode D1 that P pole is connected with the collector electrode of triode VT2, positive terminal is connected with the collector electrode of triode VT1, the not gate K that end of oppisite phase is connected with triode VT4 collector electrode, one end is connected with triode VT4 emitter, the resistance R15 that the other end is connected with the emitter of triode VT3 after resistance R14, the end of oppisite phase of P pole NAND gate K is connected, the diode D2 that N pole is connected with the tie point of resistance R14 with resistance R15 forms, the VCC pin of described driving chip U is connected with the base stage of triode VT1, END pin ground connection, OUT pin are connected with the collector electrode of triode VT2, the collector electrode of triode VT2 is also connected with the base stage of triode VT4, its emitter is connected with the base stage of triode man VT3, the grounded collector of triode VT3, the N pole of diode D2 is connected with trimming circuit and feedback circuit simultaneously.
2. a kind of stable wide band filter according to claim 1, is characterized in that: described FM circuit is by resistance R1, and resistance R2, resistance R3, polar capacitor C1, polar capacitor C2, polar capacitor C3 and potentiometer R4 form; The positive pole of polar capacitor C1 is connected with its negative pole in turn after resistance R1, resistance R2, potentiometer R4 and polar capacitor C3, resistance R3 and potentiometer R4 is in parallel, and the positive pole of polar capacitor C2 is connected with the tie point of resistance R2 with resistance R1, negative pole is then connected with the positive pole of electric capacity C4; The control end of described potentiometer R4 is connected with the negative pole of polar capacitor C3, and the negative pole of polar capacitor C3 is also connected with feedback circuit, its positive pole is then connected with trimming circuit.
3. a kind of stable wide band filter according to claim 2, is characterized in that: described trimming circuit comprises resistance R7, potentiometer R8; One end of resistance R7 is connected with the negative pole of polar capacitor C1, the other end is then connected with the N pole of diode D2 after potentiometer R8, and the control end of potentiometer R8 is connected with the N pole of diode D2.
4. a kind of stable wide band filter according to claim 3, it is characterized in that: described feedback circuit is by operational amplifier P1, operational amplifier P2, one end is connected with the output stage of operational amplifier P2, other end resistance R5 of ground connection after potentiometer R6 forms; The negative pole of described amplifier P2 is connected with its output stage, positive pole is then connected with the tie point of potentiometer R4 with polar capacitor C3, and the output stage of amplifier P1 is extremely connected with the N of diode D2, negative pole is connected with its output stage, positive pole is then connected with the control end of potentiometer R6.
5. a kind of stable wide band filter according to any one of Claims 1 to 4, is characterized in that: described driving chip U is LM387 integrated chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420740340.3U CN204316466U (en) | 2014-11-29 | 2014-11-29 | A kind of stable wide band filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420740340.3U CN204316466U (en) | 2014-11-29 | 2014-11-29 | A kind of stable wide band filter |
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| Publication Number | Publication Date |
|---|---|
| CN204316466U true CN204316466U (en) | 2015-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420740340.3U Active CN204316466U (en) | 2014-11-29 | 2014-11-29 | A kind of stable wide band filter |
Country Status (1)
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|---|---|
| CN (1) | CN204316466U (en) |
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2014
- 2014-11-29 CN CN201420740340.3U patent/CN204316466U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Ma Dongsheng Inventor after: Wu Qijuan Inventor after: Yao Hui Inventor before: Xie Bin Inventor before: He Mei |
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| COR | Change of bibliographic data | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160530 Address after: 100085 Beijing city Haidian District Xueqing Road No. 9 Ebizal building B1002 Patentee after: BEIJING DAHUA HENGWEI COMMUNICATION TECHNOLOGY CO., LTD. Address before: 610000 No. 24, Yongfeng Road, Chengdu hi tech Zone, Sichuan, 1 Patentee before: Chengdu Simao Technology Co., Ltd. |