CN108282156A - A kind of controllable type high-pass and low-pass filter - Google Patents
A kind of controllable type high-pass and low-pass filter Download PDFInfo
- Publication number
- CN108282156A CN108282156A CN201810262160.1A CN201810262160A CN108282156A CN 108282156 A CN108282156 A CN 108282156A CN 201810262160 A CN201810262160 A CN 201810262160A CN 108282156 A CN108282156 A CN 108282156A
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- capacitance
- resistance
- operational amplifier
- resistor
- electrically connected
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0153—Electrical filters; Controlling thereof
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Abstract
The invention discloses a kind of controllable type high-pass and low-pass filter, including three filtering units being connected in series with, the filtering unit includes the first capacitance, the second capacitance, third capacitance, the 4th capacitance, the 5th capacitance, the 6th capacitance, the 7th capacitance and the 8th capacitance；First resistor, second resistance, 3rd resistor and the 4th resistance；First operational amplifier and second operational amplifier；A kind of controllable type high-pass and low-pass filter of the present invention reaches the ratio for changing resistance with capacitance by changing the resistance value of variable resistance, so as to change filter centre frequency purpose.
Description
Technical field
The present invention relates to filter field more particularly to a kind of controllable type high-pass and low-pass filters.
Background technology
The design bandwidth of filter all Shang megahertz in common piece, and the filter of tens kHz bandwidth mostly uses greatly
Piece outer passive device is realized, realizes that the usual practice of huge time constant is to take big resistance small capacitances combination side in piece
Formula.Pervious filter has obvious shortcoming, and much noise can be introduced in signal path by being capacitance, to directly result in filtering
The linearity of device is not high；The centre frequency of general High Linear filter is unadjustable simultaneously, can not be according to service condition
It is adjusted.
Invention content
The purpose of the present invention is that solve the above-mentioned problems and provides a kind of controllable type high-pass and low-pass filter.
The present invention is achieved through the following technical solutions above-mentioned purpose：
A kind of controllable type high-pass and low-pass filter, including three filtering units being connected in series with, the filtering unit include,
First capacitance, the second capacitance, third capacitance, the 4th capacitance, the 5th capacitance, the 6th capacitance, the 7th capacitance and the 8th
Capacitance；
First resistor, second resistance, 3rd resistor and the 4th resistance；
First operational amplifier and second operational amplifier；
The first end of first capacitance is the ends IP of the filtering unit, and the first end of second capacitance is the filter
The ends IN of wave component, the second end of first capacitance respectively with the electrode input end of first operational amplifier, described
The first end of the first end of three capacitances, the first end of the first resistor and the 7th capacitance is electrically connected, second capacitance
Second end respectively with the negative input of first operational amplifier, the 4th capacitance first end, it is described 4th electricity
The first end of resistance and the electrical connection of the first end of the 8th capacitance, the second end of the third capacitance and first operation amplifier
The first end of the cathode output end of device and the second resistance is electrically connected, second end and first operation of the 4th capacitance
The first end of the cathode output end of amplifier and the 3rd resistor is electrically connected, the second end of the second resistance and described second
The second end of the negative input of operational amplifier and the 6th capacitance be electrically connected, the second end of the 3rd resistor with it is described
The first end of the electrode input end of second operational amplifier and the 5th capacitance is electrically connected, and the second operational amplifier is born
The second end of the second end of pole output end and the 5th capacitance, the second end of the first resistor and the 7th capacitance is electrically connected
It connects and for the ON output ends of the filtering unit, the of the cathode output end of the second operational amplifier and the 6th capacitance
The second end at two ends, the second end of the 4th resistance and the 8th capacitance is electrically connected and is exported for the OP of the filtering unit
End；
The ends IP of the adjacent filtering unit are electrically connected with the ends ON, the ends IN and the ends the OP electricity of the adjacent filtering unit
Connection.
Specifically, the capacitance of first capacitance and second capacitance is 0.2 μ F, the third capacitance and the described 4th
The capacitance of capacitance is 0.3 μ F, and the capacitance of the 5th capacitance and the 6th capacitance is 0.2 μ F, the 7th capacitance and described
The capacitance of 8th capacitance is 0.5 μ F；
The first resistor, the second resistance, the 3rd resistor and the 4th resistance are variable resistance；
The model of first operational amplifier and the second operational amplifier is OPA2123.
The beneficial effects of the present invention are：
A kind of controllable type high-pass and low-pass filter of the present invention reaches by the resistance value of change variable resistance and changes resistance with capacitance
Ratio, so as to change filter centre frequency purpose.
Description of the drawings
Fig. 1 is a kind of circuit diagram of controllable type high-pass and low-pass filter of the present invention.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings：
This technology, which essentially consists in, protects the circuit structure, and the concrete model to each electronic component and resistance R, capacitance
Deng parameter carried out detailed regulation, those skilled in the art can pass through circuit shown in FIG. 1 in its knowledge
Figure is attached each electronic component, to realize that this technology needs purpose to be achieved, that is, controls the centre frequency of filter；
And should be circuit structure, as long as each electronic component, which is connected to become a complete circuit, by conducting wire can be thus achieved its work(
Can, therefore no longer need additional specific product structure.
As shown in Figure 1, a kind of controllable type high-pass and low-pass filter of the present invention, including three filtering units being connected in series with, filter
Wave component include the first capacitance C1, the second capacitance C2, third capacitance C3, the 4th capacitance C4, the 5th capacitance C5, the 6th capacitance C6,
7th capacitance C7, the 8th capacitance C8, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the first operation are put
Big device OP1 and second operational amplifier OP2；
The first end of first capacitance C1 is the ends IP of filtering unit, and the first end of the second capacitance C2 is the IN of filtering unit
End, the second end of the first capacitance C1 respectively with the electrode input end of the first operational amplifier OP1, third capacitance C3 first end,
The first end of first resistor R1 and the electrical connection of the first end of the 7th capacitance C7, the second end of the second capacitance C2 respectively with the first operation
The first of the negative input of amplifier OP1, the first end of the 4th capacitance C4, the first end of the 4th resistance R4 and the 8th capacitance C8
End electrical connection, the first of the cathode output end and second resistance R2 of the second end of third capacitance C3 and the first operational amplifier OP1
End electrical connection, the first of the cathode output end and 3rd resistor R3 of the second end of the 4th capacitance C4 and the first operational amplifier OP1
The second of end electrical connection, the second end of second resistance R2 and the negative input of second operational amplifier OP2 and the 6th capacitance C6
The first of end electrical connection, the second end of 3rd resistor R3 and the electrode input end of second operational amplifier OP2 and the 5th capacitance C5
End electrical connection, second end, the second end of first resistor R1 of the cathode output end of second operational amplifier OP2 and the 5th capacitance C5
It is electrically connected with the second end of the 7th capacitance C7 and is the ON output ends of filtering unit, the anode output of second operational amplifier OP2
End is electrically connected with the second end of the 6th capacitance C6, the second end of the 4th resistance R4 and the second end of the 8th capacitance C8 and is filtering group
The OP output ends of part；
The ends IP of adjacent filtering unit are electrically connected with the ends ON, and the ends IN of adjacent filtering unit are electrically connected with the ends OP.
The capacitance of first capacitance C1 and the second capacitance C2 are that the capacitance of 0.2 μ F, third capacitance C3 and the 4th capacitance C4 are 0.3
The capacitance of μ F, the 5th capacitance C5 and the 6th capacitance C6 are that the capacitance of 0.2 μ F, the 7th capacitance C7 and the 8th capacitance C8 are 0.5 μ F；The
One resistance R1, second resistance R2,3rd resistor R3 and the 4th resistance R4 are variable resistance；First operational amplifier OP1 and
The model of two operational amplifier OP2 is OPA2123.
A kind of operation principle of controllable type high-pass and low-pass filter of the present invention is as follows：
The filter is total to three-level filtering component, includes a second-order bandpass filter per level-one filtering unit, passes through grade
Connection forms a 6 rank filters.
The resistance value for changing second resistance R2,3rd resistor R3, the 4th resistance R4 and first resistor R1, as first resistor R1 and
When the resistance value of 4th resistance R4 is more than the resistance value of second resistance R2 and 3rd resistor R3, integrator is in positive integral characteristic, and operation is put
The output voltage of big device increases, and reaches the ratio for changing capacitance and resistance, to achieve the purpose that centre frequency.
The technical solution of invention is not limited to the limitation of above-mentioned specific embodiment, every to make according to the technique and scheme of the present invention
Technology deformation, each fall within protection scope of the present invention.
Claims (2)
1. a kind of controllable type high-pass and low-pass filter, it is characterised in that：The filtering unit being connected in series with including three, the filtering group
Part includes,
First capacitance, the second capacitance, third capacitance, the 4th capacitance, the 5th capacitance, the 6th capacitance, the 7th capacitance and the 8th capacitance；
First resistor, second resistance, 3rd resistor and the 4th resistance；
First operational amplifier and second operational amplifier；
The first end of first capacitance is the ends IP of the filtering unit, and the first end of second capacitance is the filtering group
The second end at the ends IN of part, first capacitance is electric with the electrode input end of first operational amplifier, the third respectively
The first end of the first end of appearance, the first end of the first resistor and the 7th capacitance is electrically connected, and the of second capacitance
Two ends respectively with the negative input of first operational amplifier, the first end of the 4th capacitance, the 4th resistance
First end and the electrical connection of the first end of the 8th capacitance, the second end of the third capacitance and first operational amplifier
The first end of cathode output end and the second resistance is electrically connected, second end and first operation amplifier of the 4th capacitance
The first end of the cathode output end of device and the 3rd resistor is electrically connected, the second end of the second resistance and second operation
The second end of the negative input of amplifier and the 6th capacitance is electrically connected, the second end of the 3rd resistor and described second
The first end of the electrode input end of operational amplifier and the 5th capacitance is electrically connected, and the cathode of the second operational amplifier is defeated
Outlet be electrically connected with the second end of the second end of the 5th capacitance, the second end of the first resistor and the 7th capacitance and
For the ON output ends of the filtering unit, the cathode output end of the second operational amplifier and the second of the 6th capacitance
The second end at end, the second end of the 4th resistance and the 8th capacitance is electrically connected and is exported for the OP of the filtering unit
End；
The ends IP of the adjacent filtering unit are electrically connected with the ends ON, and the ends IN and the ends OP of the adjacent filtering unit are electrically connected
It connects.
2. a kind of controllable type high-pass and low-pass filter according to claim 1, it is characterised in that：First capacitance and described
The capacitance of second capacitance is 0.2 μ F, and the capacitance of the third capacitance and the 4th capacitance is 0.3 μ F, the 5th capacitance and
The capacitance of 6th capacitance is 0.2 μ F, and the capacitance of the 7th capacitance and the 8th capacitance is 0.5 μ F；
The first resistor, the second resistance, the 3rd resistor and the 4th resistance are variable resistance；
The model of first operational amplifier and the second operational amplifier is OPA2123.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810262160.1A CN108282156A (en) | 2018-03-28 | 2018-03-28 | A kind of controllable type high-pass and low-pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810262160.1A CN108282156A (en) | 2018-03-28 | 2018-03-28 | A kind of controllable type high-pass and low-pass filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108282156A true CN108282156A (en) | 2018-07-13 |
Family
ID=62810637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810262160.1A Withdrawn CN108282156A (en) | 2018-03-28 | 2018-03-28 | A kind of controllable type high-pass and low-pass filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108282156A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478681A (en) * | 2020-04-29 | 2020-07-31 | 无锡中感微电子股份有限公司 | Design method of analog composite filter circuit and analog filter circuit |
-
2018
- 2018-03-28 CN CN201810262160.1A patent/CN108282156A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478681A (en) * | 2020-04-29 | 2020-07-31 | 无锡中感微电子股份有限公司 | Design method of analog composite filter circuit and analog filter circuit |
| CN111478681B (en) * | 2020-04-29 | 2023-07-21 | 无锡中感微电子股份有限公司 | Design method of analog composite filter circuit and analog filter circuit |
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Application publication date: 20180713 |