CN207475503U - Novel filter circuit - Google Patents
Novel filter circuit Download PDFInfo
- Publication number
- CN207475503U CN207475503U CN201721615517.7U CN201721615517U CN207475503U CN 207475503 U CN207475503 U CN 207475503U CN 201721615517 U CN201721615517 U CN 201721615517U CN 207475503 U CN207475503 U CN 207475503U
- Authority
- CN
- China
- Prior art keywords
- operational amplifier
- resistance
- output terminal
- input end
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model provides a kind of novel in structural design, the novel filter circuit for being filtered noise reduction process to analog signal；It includes the amplifying circuit, voltage follower circuit, the filter circuit that are sequentially connected in series.
Description
Technical field
The utility model is related to a kind of circuit more particularly to a kind of novel filter circuits.
Background technology
In order to reduce the interference that external interference and hardware device bring digital signal, needed in the transmission of analog signal
It is filtered.
Invention content
The purpose of the utility model is to overcome the deficiencies in the prior art, adapt to real needs, provide a kind of structure design
Novel, the novel filter circuit for being filtered noise reduction process to analog signal.
In order to realize the purpose of this utility model, technical solution is used by the utility model：
A kind of novel filter circuit is designed, it includes the amplifying circuit, voltage follower circuit, filtered electrical being sequentially connected in series
Road.
Preferably, the amplifying circuit includes operational amplifier A 1, and the inverting input of operational amplifier A 1 is connected with electricity
R1 is hindered, the input terminal of resistance R1 is the input terminal of this amplifying circuit, and the in-phase input end of operational amplifier A 1 is grounded；The operation
The reverse input end of amplifier A1 is also connect by output terminals of the resistance R2 also with the operational amplifier A 1, the operation amplifier
The output terminal of device A1 is the output terminal of amplifying circuit.
Preferably, the voltage follower circuit includes operational amplifier A 2, and the in-phase input end of operational amplifier A 2 is electricity
Pressure follows the input terminal of circuit and is connect with the output terminal of operational amplifier A 1, and the reverse input end of the operational amplifier A 2 is also
The output terminal of the operational amplifier A 2 is connected, the output terminal of operational amplifier A 2 is the output terminal of voltage follower circuit.
Preferably, the filter circuit includes operational amplifier A 3；Further include two resistance R3, the resistance being connected in series with
R5, resistance R3, the output terminal of resistance R5 being connected in series with are connect with the in-phase input end of operational amplifier A 3, join the resistance of connection
R3, resistance R5 input terminal for filter circuit input terminal and connect with the output terminal of operational amplifier A 2.
Preferably, the reverse input end of the operational amplifier A 3 is grounded by resistance R4；The operational amplifier A 3
Reverse input end also connects the output terminal of the operational amplifier A 3 by resistance R6.
Preferably, it is grounded between the resistance R5 and the in-phase input end of operational amplifier A 3 by capacitance C2；The electricity
The output terminal with operational amplifier A 3 is also connected between resistance R3 and resistance R5 by capacitance C1.
Preferably, the output terminal of the operational amplifier A 3 is the output terminal of filter circuit.
Preferably, the resistance R3 is variable resistance.
Preferably, the C1=C2=0.2uf;R3=1.2-1.3K Ω, R5=2.2-2.3K Ω, the R4=
6.7-6.8K Ω, R6=6.7-6.8K Ω.
The beneficial effects of the utility model are：
Its novel in structural design of the design can be used for the filtering process to analog signal in use.
Description of the drawings
Fig. 1 is the circuit block diagram schematic diagram of the utility model；
Fig. 2 is the circuit theory schematic diagram of the utility model.
Specific embodiment
The utility model is further illustrated with reference to the accompanying drawings and examples：
Embodiment 1：A kind of novel filter circuit, referring to Fig. 1, Fig. 2；It includes the amplifying circuit, the electricity that are sequentially connected in series
Pressure follows circuit, filter circuit.
The amplifying circuit be used for analog signal carry out power amplification, specifically, the amplifying circuit it include operation
Amplifier A1, the inverting input of operational amplifier A 1 are connected with resistance R1, and the input terminal of resistance R1 is the defeated of this amplifying circuit
Enter end, the in-phase input end ground connection of operational amplifier A 1；The reverse input end of the operational amplifier A 1 also passes through a resistance R2
Output terminal also with the operational amplifier A 1 is connect, and the output terminal of the operational amplifier A 1 is the output terminal of amplifying circuit.
The voltage follower circuit for improving signal, specifically, the voltage follower circuit it include operation
Amplifier A2, the in-phase input end of operational amplifier A 2 for voltage follower circuit input terminal and with the output of operational amplifier A 1
End connection, the reverse input end of the operational amplifier A 2 are also connected with the output terminal of the operational amplifier A 2, operational amplifier A 2
Output terminal be voltage follower circuit output terminal.
Further, the filter circuit is the core of this circuit, and for being filtered noise reduction process to signal；Specifically
, the filter circuit it include operational amplifier A 3；Two the resistance R3 being connected in series with, resistance R5 are further included, are connected in series with
Resistance R3, resistance R5 output terminal connect with the in-phase input end of operational amplifier A 3, join the resistance R3 of connection, resistance R5
Input terminal is the input terminal of filter circuit and is connect with the output terminal of operational amplifier A 2.
Further, the reverse input end of the operational amplifier A 3 is grounded by resistance R4；The operational amplifier A 3
Reverse input end the output terminal of the operational amplifier A 3 is also connected by resistance R6.
Further, it is grounded between the resistance R5 and the in-phase input end of operational amplifier A 3 by capacitance C2；It is described
The output terminal with operational amplifier A 3 is also connected with by capacitance C1 between resistance R3 and resistance R5.
Further, the output terminal of the operational amplifier A 3 for filter circuit output terminal and as the output of this circuit
End.
The resistance R3 in the design is variable resistance, and the output times of amplifying circuit can be changed by changing resistance R3
Number.
Further, the C1=C2=0.2uf;R3=1.2-1.3K Ω, R5=2.2-2.3K Ω, the R4=
6.7-6.8K Ω, R6=6.7-6.8K Ω.
Preferably, R3=1.2K Ω, R5=2.2K Ω, R4=6.7K Ω, R6=6.7K Ω or described
R3=1.3K Ω, R5=2.3K Ω, R4=6.8K Ω, R6=6.8K Ω or, R3=1.25K Ω, the R5=
2.25K Ω, R4=6.75K Ω, R6=6.75K Ω.
What the embodiment of the utility model was announced is preferred embodiment, and however, it is not limited to this, the common skill of this field
Art personnel easily according to above-described embodiment, understand the spirit of the utility model, and make different amplification and variation, but as long as
The spirit of the utility model is not departed from, it is all within the protection scope of the present utility model.
Claims (3)
1. a kind of novel filter circuit, it is characterised in that：It include be sequentially connected in series amplifying circuit, voltage follower circuit,
Filter circuit；
The amplifying circuit includes operational amplifier A 1, and the inverting input of operational amplifier A 1 is connected with resistance R1, resistance R1
Input terminal be this amplifying circuit input terminal, operational amplifier A 1 in-phase input end ground connection；The operational amplifier A 1
Reverse input end is also connect by output terminals of the resistance R2 also with the operational amplifier A 1, the output of the operational amplifier A 1
Hold the output terminal for amplifying circuit；
The voltage follower circuit includes operational amplifier A 2, and the in-phase input end of operational amplifier A 2 is voltage follower circuit
Input terminal is simultaneously connect with the output terminal of operational amplifier A 1, and the reverse input end of the operational amplifier A 2 is also connected with the operation and puts
The output terminal of big device A2, the output terminal of operational amplifier A 2 are the output terminal of voltage follower circuit；
The filter circuit includes operational amplifier A 3；Two the resistance R3 being connected in series with, resistance R5 are further included, are connected in series with
Resistance R3, resistance R5 output terminal connect with the in-phase input end of operational amplifier A 3, join the resistance R3 of connection, resistance R5 it is defeated
Enter end for the input terminal of filter circuit and connect with the output terminal of operational amplifier A 2；
The reverse input end of the operational amplifier A 3 is grounded by resistance R4；The reverse input end of the operational amplifier A 3 is also
The output terminal of the operational amplifier A 3 is connected by resistance R6；
It is grounded between the resistance R5 and the in-phase input end of operational amplifier A 3 by capacitance C2；The resistance R3 and resistance R5
Between output terminal with operational amplifier A 3 is also connected with by capacitance C1；
The output terminal of the operational amplifier A 3 is the output terminal of filter circuit.
2. novel filter circuit as described in claim 1, it is characterised in that：The resistance R3 is variable resistance.
3. novel filter circuit as described in claim 1, it is characterised in that：The C1=C2=0.2uf；The R3=1.2-
1.3K Ω, the R5=2.2-2.3K Ω, the R4=6.7-6.8K Ω, the R6=6.7-6.8K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721615517.7U CN207475503U (en) | 2017-11-28 | 2017-11-28 | Novel filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721615517.7U CN207475503U (en) | 2017-11-28 | 2017-11-28 | Novel filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207475503U true CN207475503U (en) | 2018-06-08 |
Family
ID=62259753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721615517.7U Expired - Fee Related CN207475503U (en) | 2017-11-28 | 2017-11-28 | Novel filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207475503U (en) |
-
2017
- 2017-11-28 CN CN201721615517.7U patent/CN207475503U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180608 Termination date: 20181128 |