CN104639094A - Filtering circuit - Google Patents
Filtering circuit Download PDFInfo
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- CN104639094A CN104639094A CN201510025486.9A CN201510025486A CN104639094A CN 104639094 A CN104639094 A CN 104639094A CN 201510025486 A CN201510025486 A CN 201510025486A CN 104639094 A CN104639094 A CN 104639094A
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Abstract
The invention relates to a filtering circuit and belongs to the technical field of filtering. The invention aims at providing the filtering circuit with good filtering effect and lower cost. According to the technical scheme, the filtering circuit has a circuit structure as follows: one end of a resistor R1 is connected with a signal output end OP1 of a signal generation circuit and the other end of the resistor R1 is connected with one end of a capacitor C1 and one end of a capacitor C2 in parallel and is then connected with one end of a resistor R2; the other end of the capacitor C1 is connected with one end of a resistor R3 in parallel and is then connected with a negative input end of an operational amplifier U1; the other end of the capacitor C2 is connected with the other end of the resistor R3 in parallel and is then connected with an output end of the operational amplifier U1. The filtering circuit is applicable to the field of an electronic technology.
Description
Technical field
Filter circuit of the present invention, 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.
Summary of the invention
The present invention 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 solution adopted in the present invention is: 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 present invention compared with prior art has is: the present invention 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 present invention will be further described in detail:
Fig. 1 is circuit diagram of the present invention.
Embodiment
As shown in Figure 1, filter circuit of the present invention, 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 present invention 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. 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 |
|---|---|---|---|
| CN201510025486.9A CN104639094A (en) | 2015-01-20 | 2015-01-20 | Filtering circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510025486.9A CN104639094A (en) | 2015-01-20 | 2015-01-20 | Filtering circuit |
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| CN104639094A true CN104639094A (en) | 2015-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510025486.9A Pending CN104639094A (en) | 2015-01-20 | 2015-01-20 | Filtering circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104898529A (en) * | 2015-06-25 | 2015-09-09 | 江苏海大印染机械有限公司 | Printing device of motion controller based on embedded PLC chipset |
| CN105128670A (en) * | 2015-08-31 | 2015-12-09 | 无锡伊佩克科技有限公司 | Vehicle-mounted alcohol detection control system based on filter circuit |
| CN105160804A (en) * | 2015-07-31 | 2015-12-16 | 苏州玄禾物联网科技有限公司 | Automatic car accident location and detection system based on filter circuit |
| CN106100592A (en) * | 2016-05-31 | 2016-11-09 | 徐海慧 | A kind of low-frequency amplifier circuit |
| CN106849901A (en) * | 2016-12-28 | 2017-06-13 | 宁波斯凯勒智能科技有限公司 | A kind of audio filter circuit |
| CN106921364A (en) * | 2017-03-10 | 2017-07-04 | 成都金广通科技有限公司 | The filter of mobile data acquisition device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3718097A1 (en) * | 1987-05-29 | 1988-12-08 | Bruegemann Hans Gmbh | BANDPASS FILTER |
| CN103391068A (en) * | 2012-05-11 | 2013-11-13 | 四川优的科技有限公司 | Dual operational amplifier band-pass active power filter |
| CN203616744U (en) * | 2013-09-29 | 2014-05-28 | 深圳市巨龙科教高技术股份有限公司 | Electronic whiteboard interaction system |
| CN104579174A (en) * | 2015-01-08 | 2015-04-29 | 国家电网公司 | Fourier signal decomposition device |
| CN204349936U (en) * | 2015-01-20 | 2015-05-20 | 国家电网公司 | A kind of filter circuit |
-
2015
- 2015-01-20 CN CN201510025486.9A patent/CN104639094A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3718097A1 (en) * | 1987-05-29 | 1988-12-08 | Bruegemann Hans Gmbh | BANDPASS FILTER |
| CN103391068A (en) * | 2012-05-11 | 2013-11-13 | 四川优的科技有限公司 | Dual operational amplifier band-pass active power filter |
| CN203616744U (en) * | 2013-09-29 | 2014-05-28 | 深圳市巨龙科教高技术股份有限公司 | Electronic whiteboard interaction system |
| CN104579174A (en) * | 2015-01-08 | 2015-04-29 | 国家电网公司 | Fourier signal decomposition device |
| CN204349936U (en) * | 2015-01-20 | 2015-05-20 | 国家电网公司 | A kind of filter circuit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104898529A (en) * | 2015-06-25 | 2015-09-09 | 江苏海大印染机械有限公司 | Printing device of motion controller based on embedded PLC chipset |
| CN105160804A (en) * | 2015-07-31 | 2015-12-16 | 苏州玄禾物联网科技有限公司 | Automatic car accident location and detection system based on filter circuit |
| CN105128670A (en) * | 2015-08-31 | 2015-12-09 | 无锡伊佩克科技有限公司 | Vehicle-mounted alcohol detection control system based on filter circuit |
| CN106100592A (en) * | 2016-05-31 | 2016-11-09 | 徐海慧 | A kind of low-frequency amplifier circuit |
| CN106849901A (en) * | 2016-12-28 | 2017-06-13 | 宁波斯凯勒智能科技有限公司 | A kind of audio filter circuit |
| CN106921364A (en) * | 2017-03-10 | 2017-07-04 | 成都金广通科技有限公司 | The filter of mobile data acquisition device |
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Application publication date: 20150520 |
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