CN207559962U - A kind of signal receiving filter - Google Patents
A kind of signal receiving filter Download PDFInfo
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- CN207559962U CN207559962U CN201820014078.2U CN201820014078U CN207559962U CN 207559962 U CN207559962 U CN 207559962U CN 201820014078 U CN201820014078 U CN 201820014078U CN 207559962 U CN207559962 U CN 207559962U
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- resistance
- operational amplifier
- capacitance
- signal receiving
- output terminal
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Abstract
The utility model discloses a kind of signal receiving filter, the second-order filter circuit being connected including signal receiving circuit and with the signal receiving circuit.The utility model provides a kind of signal receiving filter, provides a kind of product of effect brilliance simple in structure, can be good at improving filter effect, reduces the difficulty of structure fine tuning, promote the development of enterprise and industry.
Description
Technical field
The utility model is related to electronic field, in particular to a kind of signal receiving filters.
Background technology
Wave filter can effectively filter out the frequency other than the frequency point or the frequency point of specific frequency in power cord, obtain
Power supply signal after one specific frequency of power supply signal or elimination of one specific frequency.
With the maturation of signal transmission technology, the demand of wave filter is also increasing, how to reduce the cost of wave filter,
The effect for improving wave filter has become the emphasis of each company's research.
Utility model content
The purpose of the utility model is to overcome the above problems, provide a kind of signal receiving filter, provide a kind of structure
The product of simple effects brilliance can be good at improving filter effect, reduce the difficulty of structure fine tuning, promote enterprise and industry
Development.
The purpose of this utility model is achieved through the following technical solutions：
A kind of signal receiving filter, the second order being connected including signal receiving circuit and with the signal receiving circuit
Filter circuit.
Including operational amplifier P1, operational amplifier P2, one end ground connection, the other end after capacitance C1 with operational amplifier P1
The resistance R2 that is connected of negative input end, the resistance that one end ground connection, the other end are connected with the positive input terminal of operational amplifier P1
R4, the resistance R1 that one end is connected with the tie point of capacitance C1 and resistance R2, one end and the tie point phase of capacitance C1 and resistance R2
The capacitance C2 that connection, the other end are connected after resistance R3 with the negative input end of operational amplifier P1, one end and resistance R3 and electricity
The tie point of appearance C2 is connected, the resistance R5 that the other end is connected after resistance R6 with the output terminal of operational amplifier P1, one end
It is connected with the output terminal of operational amplifier P1, the other end is connected with the negative input end of operational amplifier P2 resistance R7, one
End is connected with the tie point of resistance R5 and resistance R6, the capacitance that the other end is connected with the negative input end of operational amplifier P2
C3, one end is connected with the positive input terminal of operational amplifier P2, the resistance R8 of other end ground connection, is serially connected in operational amplifier P2's
Resistance R9 and one end between negative input end and output terminal are connected with the tie point of capacitance C1 and resistance R2, the other end with
The resistance R10 compositions that the output terminal of operational amplifier P2 is connected；Wherein, the other end of resistance R1 is as the second-order filter circuit
Input terminal, the output terminal of the output terminal of operational amplifier P2 as the second-order filter circuit.
Preferably, the resistance R9/ resistance R7<10, resistance R8=resistance R7//resistance R9, capacitance C1=capacitances C2.
Preferably, the model of the operational amplifier P1 and operational amplifier P2 is LM324, resistance R7 is maximum resistance
It is worth the potentiometer for 100K Ω.
Further, the signal receiving circuit is by operational amplifier P3, one end ground connection, the other end and operational amplifier
The resistance R11 that the negative input end of P3 is connected, the capacitance C4 that one end is connected with the positive input terminal of operational amplifier P3, is serially connected in
Capacitance C5 between the negative input end and output terminal of operational amplifier P3, the resistance R12 being arranged in parallel with capacitance C5 and one end
The resistance R13 compositions that ground connection, the other end are connected with the positive power source terminal of operational amplifier P3；Wherein, operational amplifier P3's is negative
Power end is grounded, the positive supply termination+12V power supplys of operational amplifier P3, and the output terminal of operational amplifier P3 is another with resistance R1's
One end is connected, the input terminal of the other end of capacitance C4 as the signal receiving circuit.
The utility model compared with prior art, has the following advantages and advantageous effect：
(1) the utility model will not influence each other when angular frequency and quality factor Q are shaken in adjustment, greatly improve electricity
The using effect on road, while improve the flexibility that circuit uses well.
(2) key components of the utility model greatly improve the range of choice of component using ratio setting,
Possess better adaptability, component resource that can according to practical demand and on hand is selected, and further reduced
Production, use and the maintenance cost of product.
(3) signal receiving circuit of the utility model can be adjusted according to practical use environment, during adjustment only
Resistance R11 or resistance R12 are needed to change to change the ratio of resistance R11 and resistance R12, possesses great flexibility.
Description of the drawings
Fig. 1 is the circuit structure diagram of the utility model.
Specific embodiment
With reference to embodiment, the utility model is described in further detail, but the embodiment of the utility model is not
It is limited to this.
Embodiment
As shown in Figure 1, a kind of signal receiving filter, including signal receiving circuit and with the signal receiving circuit phase
The second-order filter circuit of connection.
Including operational amplifier P1, operational amplifier P2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance
R6, resistance R7, resistance R8, resistance R9, resistance R10, capacitance C1, capacitance C2, capacitance C3 composition.
During connection, one end ground connection of resistance R2, negative input end of the other end with operational amplifier P1 after capacitance C1 are connected
It connects, one end ground connection of resistance R4, the other end are connected with the positive input terminal of operational amplifier P1, one end and the capacitance C1 of resistance R1
It is connected with the tie point of resistance R2, one end of capacitance C2 is connected with the tie point of capacitance C1 and resistance R2, the other end is through electricity
It is connected after resistance R3 with the negative input end of operational amplifier P1, one end of resistance R5 is connected with the tie point of resistance R3 and capacitance C2
Connect, output terminal of the other end with operational amplifier P1 after resistance R6 is connected, one end of resistance R7 is with operational amplifier P1's
Output terminal is connected, the other end is connected with the negative input end of operational amplifier P2, one end and resistance R5 and the resistance of capacitance C3
The tie point of R6 is connected, the other end is connected with the negative input end of operational amplifier P2, one end of resistance R8 and operation amplifier
The positive input terminal of device P2 is connected, other end ground connection, resistance R9 be serially connected in the negative input end of operational amplifier P2 and output terminal it
Between, one end of resistance R10 is connected with the tie point of capacitance C1 and resistance R2, the output terminal phase of the other end and operational amplifier P2
Connection；Wherein, input terminal of the other end of resistance R1 as the second-order filter circuit, the output terminal of operational amplifier P2 is used as should
The output terminal of second-order filter circuit.
The resistance R9/ resistance R7<10, resistance R8=resistance R7//resistance R9, capacitance C1=capacitances C2.
The model of the operational amplifier P1 and operational amplifier P2 is LM324, and resistance R7 is that maximum value is 100K
The potentiometer of Ω.
The parameters of circuit are：
Shake angular frequency
Quality factor
It can carry out individually, will not interacting when being adjusted the ω in circuit and Q.
The signal receiving circuit is by operational amplifier P3, resistance R11, resistance R12, resistance R13, capacitance C4, capacitance C5
Composition.
During connection, one end ground connection, the resistance R11 that is connected with the negative input end of operational amplifier P3 of the other end, one end with
The capacitance C4 that the positive input terminal of operational amplifier P3 is connected, is serially connected between the negative input end and output terminal of operational amplifier P3
Capacitance C5, the resistance R12 being arranged in parallel with capacitance C5, one end ground connection, the other end and operational amplifier P3 positive power source terminal phase
The resistance R13 of connection.
Wherein, the negative power end ground connection of operational amplifier P3, the positive supply termination+12V power supplys of operational amplifier P3, operation
The output terminal of amplifier P3 is connected with the other end of resistance R1, the input of the other end of capacitance C4 as the signal receiving circuit
End.
Electric signal is amplified by being coupled in operational amplifier P3 for coupled capacitor C11, and the ratio of amplification is A=
1+R12/R11 can come the adjusting of completed percentage, the mesh of amplification by adjusting the resistance value of resistance R11 and resistance R12 when needed
Be the filter effect for improving subsequent conditioning circuit, to avoid signal strength is too low serious in circuit internal loss and influences filtering effect
Fruit improves the using effect of circuit.
As described above, the utility model can be realized well.
Claims (5)
1. a kind of signal receiving filter, it is characterised in that：It is connected including signal receiving circuit and with the signal receiving circuit
The second-order filter circuit connect.
2. a kind of signal receiving filter according to claim 1, it is characterised in that：The second-order filter circuit is by operation
Amplifier P1, operational amplifier P2, one end ground connection, negative input end of the other end with operational amplifier P1 after capacitance C1 are connected
Resistance R2, one end ground connection, the resistance R4 that is connected with the positive input terminal of operational amplifier P1 of the other end, one end and capacitance C1 and
The resistance R1 that the tie point of resistance R2 is connected, one end is connected with the tie point of capacitance C1 and resistance R2, the other end is through resistance
The capacitance C2 being connected after R3 with the negative input end of operational amplifier P1, one end are connected with the tie point of resistance R3 and capacitance C2
It connects, the resistance R5 that the other end is connected after resistance R6 with the output terminal of operational amplifier P1, one end is with operational amplifier P1's
The resistance R7 that output terminal is connected, the other end is connected with the negative input end of operational amplifier P2, one end and resistance R5 and resistance
The capacitance C3 that the tie point of R6 is connected, the other end is connected with the negative input end of operational amplifier P2, one end and operation amplifier
The positive input terminal of device P2 is connected, the resistance R8 of other end ground connection, is serially connected in the negative input end and output terminal of operational amplifier P2
Between resistance R9 and one end be connected with the tie point of capacitance C1 and resistance R2, the other end and operational amplifier P2 it is defeated
The resistance R10 compositions that outlet is connected；Wherein, input terminal of the other end of resistance R1 as the second-order filter circuit, operation are put
Output terminal of the output terminal of big device P2 as the second-order filter circuit.
3. a kind of signal receiving filter according to claim 2, it is characterised in that：The resistance R9/ resistance R7<10,
Resistance R8=resistance R7//resistance R9, capacitance C1=capacitances C2.
4. a kind of signal receiving filter according to claim 3, it is characterised in that：The operational amplifier P1 and operation
The model of amplifier P2 is LM324, and resistance R7 is the potentiometer that maximum value is 100K Ω.
5. a kind of signal receiving filter according to claim 4, it is characterised in that：The signal receiving circuit is by operation
Amplifier P3, the resistance R11 that one end ground connection, the other end are connected with the negative input end of operational amplifier P3, one end is put with operation
The capacitance C4 that the positive input terminal of big device P3 is connected, the capacitance being serially connected between the negative input end and output terminal of operational amplifier P3
C5, the resistance R12 being arranged in parallel with capacitance C5 and one end ground connection, the other end are connected with the positive power source terminal of operational amplifier P3
The resistance R13 compositions connect；Wherein, the negative power end ground connection of operational amplifier P3, the positive supply termination+12V of operational amplifier P3
Power supply, the output terminal of operational amplifier P3 are connected with the other end of resistance R1, and the other end of capacitance C4 is received as the signal
The input terminal of circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820014078.2U CN207559962U (en) | 2018-01-04 | 2018-01-04 | A kind of signal receiving filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820014078.2U CN207559962U (en) | 2018-01-04 | 2018-01-04 | A kind of signal receiving filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207559962U true CN207559962U (en) | 2018-06-29 |
Family
ID=62660779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820014078.2U Active CN207559962U (en) | 2018-01-04 | 2018-01-04 | A kind of signal receiving filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207559962U (en) |
-
2018
- 2018-01-04 CN CN201820014078.2U patent/CN207559962U/en active Active
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