CN106788325A - A kind of high q-factor tunable filter circuit - Google Patents
A kind of high q-factor tunable filter circuit Download PDFInfo
- Publication number
- CN106788325A CN106788325A CN201611230554.6A CN201611230554A CN106788325A CN 106788325 A CN106788325 A CN 106788325A CN 201611230554 A CN201611230554 A CN 201611230554A CN 106788325 A CN106788325 A CN 106788325A
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- Prior art keywords
- electric capacity
- resistance
- amplifier
- connect
- power supplys
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/04—Frequency selective two-port networks
- H03H11/12—Frequency selective two-port networks using amplifiers with feedback
- H03H11/1217—Frequency selective two-port networks using amplifiers with feedback using a plurality of operational amplifiers
- H03H11/1234—Modifications to reduce detrimental influences of amplifier imperfections, e.g. limited gain-bandwith product, limited input impedance
Abstract
The present invention discloses a kind of high q-factor tunable filter circuit, good sensitivity is obtained by the cooperation of multilevel amplifiers, and decay and amplification by signal and feed back to twin-T network and form bootstrapping to realize the raising of Q values, in case stopping loss consumption increase causes the reduction of efficiency；And increased slide rheostat and constitute voltage follower, can continuously change Q-Value in Electric Circuit for avoiding high-frequency resonant gain excessive.
Description
Technical field
The present invention relates to filter field, and in particular to a kind of high q-factor tunable filter circuit.
Background technology
Q values are to weigh the major parameter of inductance component, refer to inductor when the alternating voltage of a certain frequency works, and are in
The ratio between existing induction reactance and its equivalent loss resistance.
Existing active filter circuit is accessed suitably in being typically chosen in the input branch road of amplifier amplifier and backfeed loop
RC network, but because the open-loop gain of amplifier causes input and output impedance to be unlikely to be ideal situation, may result in this kind of
The Q values of circuit are very restricted so that loss increases.
The content of the invention
The purpose of the present invention is a kind of high q-factor and the filter circuit that can be adjusted.
The present invention is achieved through the following technical solutions：A kind of high q-factor tunable filter circuit, including input port, output end
Mouth, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance,
Nine resistance, the tenth resistance, the 11st resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th
Electric capacity, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the tenth electric capacity, slide rheostat, the first amplifier, the second amplifier, the 3rd fortune
Put, four high guaily unit；The input port connects one end of first resistor, and the other end of the first resistor is connected to the first electric capacity
One end, one end of first electric capacity is also connected with one end of the second electric capacity, the electricity of other end connection second of first electric capacity
One end of resistance, the other end of second electric capacity connects the other end of second resistance, and the other end of the second resistance is connected to
The negative input end of the first amplifier, one end of the second resistance is additionally coupled to the output end of the first amplifier, second electric capacity
One end is also connected with one end of 3rd resistor, and the other end of the 3rd resistor is connected to the positive input terminal of the first amplifier and all connects
Ground；The output end of first amplifier is additionally coupled to one end of the 5th resistance, and the other end of the 5th resistance is connected to second
The negative input end of amplifier, the negative input end of second amplifier is also connected with one end of the 6th resistance, the 6th resistance it is another
End is also connected with the output end of the second amplifier, and the 6th resistance is also parallel with the 5th electric capacity, the positive input terminal of second amplifier
Connect one end of the 7th resistance, the other end ground connection of the 7th resistance；The output end of second amplifier is connected with the 4th electricity
One end of resistance, the other end of the 4th resistance is connected to the other end of first resistor；One end of 4th resistance is also connected with
To one end of the 9th resistance, the other end of the 9th resistance connects one end of the tenth electric capacity, and one end of the tenth electric capacity is also
One end of the tenth resistance is connected to, the other end of the tenth electric capacity is also connected with one end of the 8th resistance, the 9th resistance
One end is also connected with one end of the 9th electric capacity, and the other end of the 9th electric capacity is connected to the other end of the 8th resistance, the described 8th
The other end of resistance is connected to one end of the 8th electric capacity, and the other end of the 8th electric capacity is connected to the other end of the tenth resistance,
The other end of the tenth resistance is additionally coupled to one end of the 11st resistance, and the other end of the 11st resistance is connected to the 3rd
The positive input terminal of amplifier, the negative input end of the 3rd amplifier is connected to the output end of the 3rd amplifier；Tenth electric capacity it is another
One end is additionally coupled to one end of the 11st electric capacity, the other end ground connection of the 11st electric capacity, one end of the 11st electric capacity
The output end of four high guaily unit is additionally coupled to, the output end of the four high guaily unit is also connected with the negative input end of value four high guaily unit, described
The positive input terminal of four high guaily unit is also connected with the sliding end of slide rheostat, one end ground connection of the slide rheostat, the slip
The rheostatic other end is connected to the output end of the 3rd amplifier, and the output end of the 3rd amplifier is connected to output port；It is described
The positive supply terminals of the first amplifier connect one end of the 3rd electric capacity, the other end ground connection of the 3rd electric capacity, the 3rd electricity
One end of appearance is also connected with V+ power supplys；The negative supply terminals of first amplifier connect one end of the 4th electric capacity, the 4th electricity
The other end ground connection of appearance, one end of the 4th electric capacity is also connected with V- power supplys；The positive supply terminals connection of second amplifier
One end of 6th electric capacity, the other end ground connection of the 6th electric capacity, one end of the 6th electric capacity is also connected with V+ power supplys；Described
The negative supply terminals of two amplifiers connect one end of the 7th electric capacity, the other end ground connection of the 7th electric capacity, the 7th electric capacity
One end be also connected with V- power supplys；The positive supply terminals connection V+ power supplys of the 3rd amplifier, the negative supply of the 3rd amplifier
Terminals connect V- power supplys；The positive supply terminals connection V+ power supplys of the four high guaily unit, the negative supply of the four high guaily unit connects
Line end connects V- power supplys.
The present invention obtains good sensitivity by the cooperation of multilevel amplifiers, and decay and amplification by signal and
Feed back to twin-T network to form bootstrapping to realize the raising of Q values, the reduction of efficiency is caused in case stopping loss consumption and increasing；And increased
Slide rheostat constitutes voltage follower, can continuously change Q-Value in Electric Circuit for avoiding high-frequency resonant gain excessive.
The present invention is advantageous in that：1）Ensure high q-factor, reduce its filtering loss, prevent the generation of electromagnetic interference；
2）So that the dough softening of filtering reaches requirement, it is ensured that bandwidth of rejection and stopband attenuation；3）Q values can be adjusted, it is to avoid high-frequency resonant
Gain is excessive.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the invention.
Specific embodiment
Below in conjunction with the accompanying drawings with specific embodiment, the invention will be further described.
See Fig. 1, a kind of high q-factor tunable filter circuit, including input port, output port, first resistor R1, second resistance
R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance
R9, the tenth resistance R10, the 11st resistance R11, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th
Electric capacity C5, the 6th electric capacity C6, the 7th electric capacity C7, the 8th electric capacity C8, the 9th electric capacity C9, the tenth electric capacity C10, slide rheostat RW1,
First amplifier U1, the second amplifier U2, the 3rd amplifier U3, four high guaily unit U4；One end of the input port connection first resistor R1,
The other end of the first resistor R1 is connected to one end of the first electric capacity C1, and one end of the first electric capacity C1 is also connected with the second electricity
Hold one end of C2, one end of the other end connection second resistance R2 of the first electric capacity C1, the other end of the second electric capacity C2
The other end of connection second resistance R2, the other end of the second resistance R2 is connected to the negative input end of the first amplifier U1, described
One end of second resistance R2 is additionally coupled to the output end of the first amplifier U1, and one end of the second electric capacity C2 is also connected with 3rd resistor
One end of R3, the other end of the 3rd resistor R3 is connected to the positive input terminal of the first amplifier U1 and is all grounded；Described first
The output end of amplifier U1 is additionally coupled to one end of the 5th resistance R5, and the other end of the 5th resistance R5 is connected to the second amplifier U2
Negative input end, the negative input end of the second amplifier U2 is also connected with one end of the 6th resistance R6, and the 6th resistance R6's is another
One end is also connected with the output end of the second amplifier U2, and the 6th resistance R6 is also parallel with the 5th electric capacity C5, the second amplifier U2
Positive input terminal connect the 7th resistance R7 one end, the 7th resistance R7 the other end ground connection；The second amplifier U2's is defeated
Go out one end that end is connected with the 4th resistance R4, the other end of the 4th resistance R4 is connected to the other end of first resistor R1；Institute
The one end for stating the 4th resistance R4 is additionally coupled to one end of the 9th resistance R9, and the other end of the 9th resistance R9 connects the tenth electric capacity
One end of C10, one end of the tenth electric capacity C10 is additionally coupled to one end of the tenth resistance R10, and the tenth electric capacity C10's is another
One end is also connected with one end of the 8th resistance R8, and one end of the 9th resistance R9 is also connected with one end of the 9th electric capacity C9, described
The other end of nine electric capacity C9 is connected to the other end of the 8th resistance R8, and the other end of the 8th resistance R8 is connected to the 8th electric capacity
One end of C8, the other end of the 8th electric capacity C8 is connected to the other end of the tenth resistance R10, and the tenth resistance R10's is another
One end is additionally coupled to one end of the 11st resistance R11, and the other end of the 11st resistance R11 is being connected to the 3rd amplifier U3 just
Input, the negative input end of the 3rd amplifier U3 is connected to the output end of the 3rd amplifier U3；The tenth electric capacity C10's is another
End is additionally coupled to one end of the 11st electric capacity C11, the other end ground connection of the 11st electric capacity C11, the 11st electric capacity C11
One end be additionally coupled to the output end of four high guaily unit U4, the output end of the four high guaily unit U10 is also connected with value four high guaily unit U4's
Negative input end, the positive input terminal of the four high guaily unit U4 is also connected with the sliding end of slide rheostat RW1, the slide rheostat
One end ground connection of RW1, the other end of the slide rheostat RW1 is connected to the output end of the 3rd amplifier U3, the 3rd amplifier
The output end of U3 is connected to output port；The positive supply terminals of the first amplifier U1 connect one end of the 3rd electric capacity C3, institute
The other end ground connection of the 3rd electric capacity C3 is stated, one end of the 3rd electric capacity C3 is also connected with V+ power supplys；The first amplifier U1's is negative
Supply terminals connects one end of the 4th electric capacity C4, the other end ground connection of the 4th electric capacity C4, the one of the 4th electric capacity C4
End is also connected with V- power supplys；The positive supply terminals of the second amplifier U2 connect one end of the 6th electric capacity C6, the 6th electric capacity
The other end ground connection of C6, one end of the 6th electric capacity C3 is also connected with V+ power supplys；The negative supply terminals of the second amplifier U2
One end of the 7th electric capacity C7 is connected, the other end of the 7th electric capacity C7 is grounded, and one end of the 7th electric capacity C7 is also connected with V-
Electricity；The positive supply terminals connection V+ power supplys of the 3rd amplifier U3, the negative supply terminals connection V- of the 3rd amplifier U3
Power supply；The positive supply terminals connection V+ power supplys of the four high guaily unit U4, the negative supply terminals connection of the four high guaily unit U4
V- power supplys.
In present embodiment, signal by input port enter after be filtered by the first amplifier U1, signal attenuation compared with
It is big and multiplication factor is small, but it is amplified by resistance to the defeated of the first amplifier U1 by carrying out multiple after the second amplifier U2
Enter end, introduce a certain amount of positive feedback, improve the Q values of whole circuit, carried out subsequently into the 3rd amplifier U3 and four high guaily unit U4
Filtering, and the signal being input into feeds back to twin-T network formation bootstrapping, the Q values for more preferably improving, it is ensured that high q-factor must be stablized.
In present embodiment, be connected with slide rheostat RW1 in the positive input of four high guaily unit U4 with formed voltage with
With device, the Q values of circuit so can be just changed by slide rheostat RW1, to prevent high-frequency resonant gain excessive so as to influence electricity
The stability on road.
Protection scope of the present invention includes but is not limited to embodiment of above, and protection scope of the present invention is with claims
Be defined, any replacement being readily apparent that to those skilled in the art that this technology is made, deformation, improvement each fall within it is of the invention
Protection domain.
Claims (3)
1. a kind of high q-factor tunable filter circuit, it is characterised in that：Including input port, output port, first resistor（R1）,
Two resistance（R2）, 3rd resistor（R3）, the 4th resistance（R4）, the 5th resistance（R5）, the 6th resistance（R6）, the 7th resistance（R7）、
8th resistance（R8）, the 9th resistance（R9）, the tenth resistance（R10）, the 11st resistance（R11）, the first electric capacity（C1）, the second electric capacity
（C2）, the 3rd electric capacity（C3）, the 4th electric capacity（C4）, the 5th electric capacity（C5）, the 6th electric capacity（C6）, the 7th electric capacity（C7）, the 8th electricity
Hold（C8）, the 9th electric capacity（C9）, the tenth electric capacity（C10）, slide rheostat（RW1）, the first amplifier（U1）, the second amplifier（U2）、
3rd amplifier（U3）, four high guaily unit（U4）；The input port connects first resistor（R1）One end, the first resistor（R1）
The other end be connected to the first electric capacity（C1）One end, first electric capacity（C1）One end be also connected with the second electric capacity（C2）One
End, first electric capacity（C1）The other end connection second resistance（R2）One end, second electric capacity（C2）The other end connect
Connect second resistance（R2）The other end, the second resistance（R2）The other end be connected to the first amplifier（U1）Negative input end,
The second resistance（R2）One end be additionally coupled to the first amplifier（U1）Output end, second electric capacity（C2）One end also connect
Connect 3rd resistor（R3）One end, the 3rd resistor（R3）The other end be connected to the first amplifier（U1）Positive input terminal and
All it is grounded；First amplifier（U1）Output end be additionally coupled to the 5th resistance（R5）One end, the 5th resistance（R5）'s
The other end is connected to the second amplifier（U2）Negative input end, second amplifier（U2）Negative input end be also connected with the 6th resistance
（R6）One end, the 6th resistance（R6）The other end be also connected with the second amplifier（U2）Output end, the 6th resistance
（R6）Also it is parallel with the 5th electric capacity（C5）, second amplifier（U2）Positive input terminal connect the 7th resistance（R7）One end, institute
State the 7th resistance（R7）The other end ground connection；Second amplifier（U2）Output end be connected with the 4th resistance（R4）One end,
4th resistance（R4）The other end be connected to first resistor（R1）The other end；4th resistance（R4）One end also connect
It is connected to the 9th resistance（R9）One end, the 9th resistance（R9）The other end connect the tenth electric capacity（C10）One end, described
Ten electric capacity（C10）One end be additionally coupled to the tenth resistance（R10）One end, the tenth electric capacity（C10）The other end be also connected with
8th resistance（R8）One end, the 9th resistance（R9）One end be also connected with the 9th electric capacity（C9）One end, it is described 9th electricity
Hold（C9）The other end be connected to the 8th resistance（R8）The other end, the 8th resistance（R8）The other end be connected to the 8th electricity
Hold（C8）One end, the 8th electric capacity（C8）The other end be connected to the tenth resistance（R10）The other end, the tenth resistance
（R10）The other end be additionally coupled to the 11st resistance（R11）One end, the 11st resistance（R11）The other end be connected to
3rd amplifier（U3）Positive input terminal, the 3rd amplifier（U3）Negative input end be connected to the 3rd amplifier（U3）Output end；
Tenth electric capacity（C10）The other end be additionally coupled to the 11st electric capacity（C11）One end, the 11st electric capacity（C11）'s
The other end is grounded, the 11st electric capacity（C11）One end be additionally coupled to four high guaily unit（U4）Output end, the four high guaily unit
（U10）Output end be also connected with value four high guaily unit（U4）Negative input end, the four high guaily unit（U4）Positive input terminal be also connected with
Slide rheostat（RW1）Sliding end, the slide rheostat（RW1）One end ground connection, the slide rheostat（RW1）It is another
One end is connected to the 3rd amplifier（U3）Output end, the 3rd amplifier（U3）Output end be connected to output port.
2. a kind of high q-factor tunable filter circuit according to claim 1, it is characterised in that：First amplifier（U1）'s
Positive supply terminals connect the 3rd electric capacity（C3）One end, the 3rd electric capacity（C3）The other end ground connection, the 3rd electric capacity
（C3）One end be also connected with V+ power supplys；First amplifier（U1）Negative supply terminals connect the 4th electric capacity（C4）One end,
4th electric capacity（C4）The other end ground connection, the 4th electric capacity（C4）One end be also connected with V- power supplys；Second amplifier
（U2）Positive supply terminals connect the 6th electric capacity（C6）One end, the 6th electric capacity（C6）Other end ground connection, described the
Six electric capacity（C3）One end be also connected with V+ power supplys；Second amplifier（U2）Negative supply terminals connect the 7th electric capacity（C7）'s
One end, the 7th electric capacity（C7）The other end ground connection, the 7th electric capacity（C7）One end be also connected with V- power supplys.
3. a kind of high q-factor tunable filter circuit according to claim 1, it is characterised in that：3rd amplifier（U3）'s
Positive supply terminals connect V+ power supplys, the 3rd amplifier（U3）Negative supply terminals connection V- power supplys；The four high guaily unit
（U4）Positive supply terminals connection V+ power supplys, the four high guaily unit（U4）Negative supply terminals connection V- power supplys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611230554.6A CN106788325A (en) | 2016-12-28 | 2016-12-28 | A kind of high q-factor tunable filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611230554.6A CN106788325A (en) | 2016-12-28 | 2016-12-28 | A kind of high q-factor tunable filter circuit |
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| Publication Number | Publication Date |
|---|---|
| CN106788325A true CN106788325A (en) | 2017-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611230554.6A Pending CN106788325A (en) | 2016-12-28 | 2016-12-28 | A kind of high q-factor tunable filter circuit |
Country Status (1)
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| CN (1) | CN106788325A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109579884A (en) * | 2018-12-08 | 2019-04-05 | 山西大学 | A kind of band biasing zeroing and the continuously adjustable single channel photodetector of gain |
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| CN204290906U (en) * | 2014-11-26 | 2015-04-22 | 成都深思科技有限公司 | Utilize operational amplifier as the filter of voltage follower |
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2016
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| US20080197924A1 (en) * | 2007-02-16 | 2008-08-21 | Fujitsu Limited | Variable gain amplifier circuit and filter circuit |
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| CN204190713U (en) * | 2014-10-29 | 2015-03-04 | 成都实瑞达科技有限公司 | A kind of wide band filter |
| CN204290906U (en) * | 2014-11-26 | 2015-04-22 | 成都深思科技有限公司 | Utilize operational amplifier as the filter of voltage follower |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109579884A (en) * | 2018-12-08 | 2019-04-05 | 山西大学 | A kind of band biasing zeroing and the continuously adjustable single channel photodetector of gain |
| CN109579884B (en) * | 2018-12-08 | 2020-03-20 | 山西大学 | Single-channel photoelectric detector with bias zero adjustment and continuously adjustable gain |
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Application publication date: 20170531 |