CN204349936U - A kind of filter circuit - Google Patents
A kind of filter circuit Download PDFInfo
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- CN204349936U CN204349936U CN201520035238.8U CN201520035238U CN204349936U CN 204349936 U CN204349936 U CN 204349936U CN 201520035238 U CN201520035238 U CN 201520035238U CN 204349936 U CN204349936 U CN 204349936U
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- 238000001914 filtration Methods 0.000 abstract description 10
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- 238000005516 engineering process Methods 0.000 abstract description 5
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- 230000005540 biological transmission Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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Abstract
A kind of filter circuit of the utility model, belongs to technical field of filtering; The technical problem solved is: provide a kind of good wave filtering effect and lower-cost filter circuit; The technical scheme adopted is: a kind of filter circuit, circuit structure is: one end of resistance R1 is connected with the signal output part OP1 of signal generating circuit, be connected with one end of resistance R2 behind one end of other end shunt-wound capacitance C1 of described resistance R1 and one end of electric capacity C2, the other end of described electric capacity C1 is also connected with the negative input end of operational amplifier U1 behind one end of connecting resistance R3, and the other end of described electric capacity C2 is also connected with the output of operational amplifier U1 after the other end of connecting resistance R3; The utility model is applicable to electronic technology field.
Description
Technical field
A kind of filter circuit of the utility model, belongs to technical field of filtering.
Background technology
At electronic technology field, " ripple " is narrowly confined to refer in particular to the process of the value fluctuations in time describing various physical quantity, and this process, by the effect of various kinds of sensors, is converted into the function of time of voltage or electric current, be referred to as the time waveform of various physical quantity, or be referred to as signal.Because the independent variable time is continuous value, be referred to as continuous time signal, be referred to as again analog signal (Analog Signal) habitually.
Along with generation and the develop rapidly of digital electronic computer technology, for the ease of computer, signal is processed, create complete Theories and methods continuous time signal being transformed into discrete-time signal under sampling theorem instructs.That is, can only express primary signal by the sample value of original analog signal on series of discrete time coordinate point and not lose any information, since what these concepts of ripple, waveform, signal were expressed is the change of various physical quantity in objective world, is exactly the carrier of the various information that modern society depends on for existence naturally.Informational needs is propagated, and what lean on is exactly the transmission of waveform signal.
Signal it generation, conversion, transmission each link may distort due to the existence of environment and interference, or even in quite a number of cases, this distortion is also very serious, so that signal and entrained information thereof have been embedded in the middle of noise dearly, so existing signal generator all needs filter realize its filter effect, when this kind equipment is mostly expensive, filter effect also differs and reserves.
Utility model content
The utility model overcomes the deficiency that prior art exists, and technical problem to be solved is: provide a kind of good wave filtering effect and lower-cost filter circuit.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of filter circuit, circuit structure is: one end of resistance R1 is connected with the signal output part OP1 of signal generating circuit, be connected with one end of resistance R2 behind one end of other end shunt-wound capacitance C1 of described resistance R1 and one end of electric capacity C2, the other end of described electric capacity C1 is also connected with the negative input end of operational amplifier U1 behind one end of connecting resistance R3, the other end of described electric capacity C2 is also connected with the output of operational amplifier U1 after the other end of connecting resistance R3, the other end ground connection of described resistance R2;
The positive input terminal of described operational amplifier U1 is ground connection after series resistor R4 and resistance R5 successively, be connected with one end of resistance R6 behind one end of the positive power source terminal shunt-wound capacitance C3 of operational amplifier U1, the other end of described resistance R6 is connected with+15V power supply, the other end ground connection of described electric capacity C3, the negative power end of operational amplifier U1 is also connected with one end of electric capacity C4 behind one end of connecting resistance R7, the other end of described resistance R7 is connected with ﹣ 15V power supply, the other end ground connection of described electric capacity C4;
Be connected with a stiff end of potentiometer W1 after the output serial capacitance C5 of described operational amplifier U1, the movable end of described potentiometer W1 is also connected with the positive pole of electric capacity C6 after connecing another stiff end of potentiometer W1 and one end of resistance R8, the other end ground connection of described resistance R8, the negative pole of described electric capacity C6 is connected with one end of resistance R9;
Be connected with one end of resistance R10 behind one end of other end shunt-wound capacitance C7 of described resistance R9 and one end of electric capacity C8, the other end of described electric capacity C7 is also connected with the negative input end of operational amplifier U2 behind one end of connecting resistance R11, the other end of described electric capacity C8 is also connected with the output of operational amplifier U2 after the other end of connecting resistance R11, the other end ground connection of described resistance R10;
The positive input terminal of described operational amplifier U2 is ground connection after series resistor R12 and resistance R13 successively, be connected with one end of resistance R14 behind one end of the positive power source terminal shunt-wound capacitance C9 of operational amplifier U2, the other end of described resistance R14 is connected with+15V power supply, the other end ground connection of described electric capacity C9, the negative power end of operational amplifier U2 is also connected with one end of electric capacity C10 behind one end of connecting resistance R15, the other end of described resistance R15 is connected with ﹣ 15V power supply, the other end ground connection of described electric capacity C10; The output of described operational amplifier U2 is connected with the positive pole of electric capacity C11, ground connection after the negative pole series resistor R16 of described electric capacity C11, and the negative pole of described electric capacity C11 is signal output part OP2.
The beneficial effect that the utility model compared with prior art has is: the utility model is combined by two second order bandwidth-limited circuits, filtering can be carried out to the square-wave signal of input and triangular signal, input signal is via electric capacity C1, electric capacity C2, resistance R3, resistance R4, the bandwidth-limited circuit of resistance R5 and amplifier U14 composition, high-pass filtering circuit again through being made up of resistance R8 and electric capacity C6, then enter in the bandwidth-limited circuit of lower single order, electric capacity C5 wherein and electric capacity C11 is interpolar coupling capacitance, filtering so step by step, at the sine wave of the negative pole outputting high quality of electric capacity C11, whole circuit structure is succinct, and components and parts cost is lower, practical.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described in more detail:
Fig. 1 is circuit diagram of the present utility model.
Embodiment
As shown in Figure 1, a kind of filter circuit of the utility model, circuit structure is: one end of resistance R1 is connected with the signal output part OP1 of signal generating circuit, be connected with one end of resistance R2 behind one end of other end shunt-wound capacitance C1 of described resistance R1 and one end of electric capacity C2, the other end of described electric capacity C1 is also connected with the negative input end of operational amplifier U1 behind one end of connecting resistance R3, the other end of described electric capacity C2 is also connected with the output of operational amplifier U1 after the other end of connecting resistance R3, the other end ground connection of described resistance R2.
The positive input terminal of described operational amplifier U1 is ground connection after series resistor R4 and resistance R5 successively, be connected with one end of resistance R6 behind one end of the positive power source terminal shunt-wound capacitance C3 of operational amplifier U1, the other end of described resistance R6 is connected with+15V power supply, the other end ground connection of described electric capacity C3, the negative power end of operational amplifier U1 is also connected with one end of electric capacity C4 behind one end of connecting resistance R7, the other end of described resistance R7 is connected with ﹣ 15V power supply, the other end ground connection of described electric capacity C4.
Be connected with a stiff end of potentiometer W1 after the output serial capacitance C5 of described operational amplifier U1, the movable end of described potentiometer W1 is also connected with the positive pole of electric capacity C6 after connecing another stiff end of potentiometer W1 and one end of resistance R8, the other end ground connection of described resistance R8, the negative pole of described electric capacity C6 is connected with one end of resistance R9.
Be connected with one end of resistance R10 behind one end of other end shunt-wound capacitance C7 of described resistance R9 and one end of electric capacity C8, the other end of described electric capacity C7 is also connected with the negative input end of operational amplifier U2 behind one end of connecting resistance R11, the other end of described electric capacity C8 is also connected with the output of operational amplifier U2 after the other end of connecting resistance R11, the other end ground connection of described resistance R10.
The positive input terminal of described operational amplifier U2 is ground connection after series resistor R12 and resistance R13 successively, be connected with one end of resistance R14 behind one end of the positive power source terminal shunt-wound capacitance C9 of operational amplifier U2, the other end of described resistance R14 is connected with+15V power supply, the other end ground connection of described electric capacity C9, the negative power end of operational amplifier U2 is also connected with one end of electric capacity C10 behind one end of connecting resistance R15, the other end of described resistance R15 is connected with ﹣ 15V power supply, the other end ground connection of described electric capacity C10; The output of described operational amplifier U2 is connected with the positive pole of electric capacity C11, ground connection after the negative pole series resistor R16 of described electric capacity C11, and the negative pole of described electric capacity C11 is signal output part OP2.
The utility model is combined by two second order bandwidth-limited circuits, filtering can be carried out to the square-wave signal of input and triangular signal, the bandwidth-limited circuit that input signal forms via electric capacity C1, electric capacity C2, resistance R3, resistance R4, resistance R5 and amplifier U14, high-pass filtering circuit again through being made up of resistance R8 and electric capacity C6, then enter in the bandwidth-limited circuit of lower single order, electric capacity C5 wherein and electric capacity C11 is interpolar coupling capacitance, filtering so step by step, at the sine wave of the negative pole outputting high quality of electric capacity C11; Whole circuit structure is succinct, and components and parts cost is lower, practical.
Claims (1)
1. a filter circuit, it is characterized in that: circuit structure is: one end of resistance R1 is connected with the signal output part OP1 of signal generating circuit, be connected with one end of resistance R2 behind one end of other end shunt-wound capacitance C1 of described resistance R1 and one end of electric capacity C2, the other end of described electric capacity C1 is also connected with the negative input end of operational amplifier U1 behind one end of connecting resistance R3, the other end of described electric capacity C2 is also connected with the output of operational amplifier U1 after the other end of connecting resistance R3, the other end ground connection of described resistance R2;
The positive input terminal of described operational amplifier U1 is ground connection after series resistor R4 and resistance R5 successively, be connected with one end of resistance R6 behind one end of the positive power source terminal shunt-wound capacitance C3 of operational amplifier U1, the other end of described resistance R6 is connected with+15V power supply, the other end ground connection of described electric capacity C3, the negative power end of operational amplifier U1 is also connected with one end of electric capacity C4 behind one end of connecting resistance R7, the other end of described resistance R7 is connected with ﹣ 15V power supply, the other end ground connection of described electric capacity C4;
Be connected with a stiff end of potentiometer W1 after the output serial capacitance C5 of described operational amplifier U1, the movable end of described potentiometer W1 is also connected with the positive pole of electric capacity C6 after connecing another stiff end of potentiometer W1 and one end of resistance R8, the other end ground connection of described resistance R8, the negative pole of described electric capacity C6 is connected with one end of resistance R9;
Be connected with one end of resistance R10 behind one end of other end shunt-wound capacitance C7 of described resistance R9 and one end of electric capacity C8, the other end of described electric capacity C7 is also connected with the negative input end of operational amplifier U2 behind one end of connecting resistance R11, the other end of described electric capacity C8 is also connected with the output of operational amplifier U2 after the other end of connecting resistance R11, the other end ground connection of described resistance R10;
The positive input terminal of described operational amplifier U2 is ground connection after series resistor R12 and resistance R13 successively, be connected with one end of resistance R14 behind one end of the positive power source terminal shunt-wound capacitance C9 of operational amplifier U2, the other end of described resistance R14 is connected with+15V power supply, the other end ground connection of described electric capacity C9, the negative power end of operational amplifier U2 is also connected with one end of electric capacity C10 behind one end of connecting resistance R15, the other end of described resistance R15 is connected with ﹣ 15V power supply, the other end ground connection of described electric capacity C10; The output of described operational amplifier U2 is connected with the positive pole of electric capacity C11, ground connection after the negative pole series resistor R16 of described electric capacity C11, and the negative pole of described electric capacity C11 is signal output part OP2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520035238.8U CN204349936U (en) | 2015-01-20 | 2015-01-20 | A kind of filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520035238.8U CN204349936U (en) | 2015-01-20 | 2015-01-20 | A kind of filter circuit |
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| Publication Number | Publication Date |
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| CN204349936U true CN204349936U (en) | 2015-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520035238.8U Active CN204349936U (en) | 2015-01-20 | 2015-01-20 | A kind of filter circuit |
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| CN (1) | CN204349936U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104570008A (en) * | 2015-01-21 | 2015-04-29 | 成都博智维讯信息技术有限公司 | Special GPS signal transmitting equipment for aircraft |
| CN104639094A (en) * | 2015-01-20 | 2015-05-20 | 国家电网公司 | Filtering circuit |
| CN108074402A (en) * | 2016-11-12 | 2018-05-25 | 华东交通大学 | Vehicle detector |
-
2015
- 2015-01-20 CN CN201520035238.8U patent/CN204349936U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104639094A (en) * | 2015-01-20 | 2015-05-20 | 国家电网公司 | Filtering circuit |
| CN104570008A (en) * | 2015-01-21 | 2015-04-29 | 成都博智维讯信息技术有限公司 | Special GPS signal transmitting equipment for aircraft |
| CN108074402A (en) * | 2016-11-12 | 2018-05-25 | 华东交通大学 | Vehicle detector |
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