CN201576938U - Active state variable band-pass filter - Google Patents
Active state variable band-pass filter Download PDFInfo
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- CN201576938U CN201576938U CN2009202221022U CN200920222102U CN201576938U CN 201576938 U CN201576938 U CN 201576938U CN 2009202221022 U CN2009202221022 U CN 2009202221022U CN 200920222102 U CN200920222102 U CN 200920222102U CN 201576938 U CN201576938 U CN 201576938U
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Abstract
The utility model discloses an active state variable band-pass filter, which is composed of a difference input circuit, a sixth-order low-pass filter, a sixth-order high-pass filter and a difference output circuit, wherein, the difference input circuit converts an input signal (1) and an another input signal (2) at the preceding stage into a single-ended signal and transmits the single-ended signal to the sixth-order low-pass filter and also transmits a low-pass signal outputted through the sixth-order low-pass filter to the sixth-order high-pass filter, and converts the single-ended signal into an output signal (1) and an another output signal (2) through the difference output circuit finally. The utility model has the advantages of small volume, light weight, high precision and reliability as well as integrated level, low output noise and the like.
Description
Technical field the utility model relates to a kind of active filter, relates in particular to the low noise active state variable band pass filter of a kind of high accuracy.
Background technology suppresses the filter that the circuit AC noise is disturbed, and is divided into two kinds of passive filter and active filters from implementation.Wherein passive filter to certain subharmonic low-resistance (tuning filtering) state in parallel, constitutes a low resistance state path for certain subharmonic current by the coupling of inductance and electric capacity.Because its cost is lower, so at present more common.But, aspect component count, built-up time, bandpass signal loss outside PCB board area, occupying volume, the electromagnetic interference and tolerance limit that inductor is caused, it has some shortcomings again.Inductor and electric capacity can exist usually ± and the difference of 10% individual difference, particularly low-cost assembly can be bigger.And active filter is made up of integrated transporting discharging and R, C, has without advantage such as inductance, volume be little, in light weight.And the open-loop voltage gain of integrated transporting discharging and input impedance are all very high, and output resistance is little, also have certain voltage amplification and buffering effect after constituting power filter.So long as adopt high-quality electric capacity and resistance, under the situation of the roomy cut-off frequency that is higher than filter greatly in the natural zone of the amplifier of supposition, the controllability of active filter just is far longer than passive filter.In addition, the PCB board area that active filter takies is also much smaller, only need element of buying, so just reduced the quantity of element greatly, thereby be widely used in various measuring instruments, communication apparatus, remote-control romote-sensing and other needs in the system of signal processing, the AC signal that is used for suppressing in the circuit is disturbed, thereby obtains pure useful signal.It plays a part very important for the performance that improves these measuring instruments and equipment.But evenness and output noise are not ideal enough in the band of active filter at present, and use PCB technology mostly.
The summary of the invention the purpose of this utility model provides that a kind of volume is little, high accuracy, low noise, active state variable band pass filter that reliability is high.
The purpose of this utility model is achieved in that it is made up of difference input circuit, six rank low pass filters, six rank high pass filters and differential output circuit; Described difference input circuit is converted to single-ended signal with prime one input signal 1 and another input signal 2, and give six rank low pass filters, give six rank high pass filters through the low-pass signal of six rank low pass filters output, by differential output circuit single-ended signal is converted to output signal 1 and another output signal 2 more at last.
Described six rank low-pass filter circuits are that the second-order low-pass filter circuit by 3 series connection constitutes.
Described six rank high-pass filtering circuits are that the second order high-pass filtering circuit by 3 series connection constitutes.
Described second-order low-pass filter circuit structure is identical with second order high-pass filtering circuit structure.
The utility model input adopts differential mode, has suppressed the common mode disturbances in the signal; Six rank low pass parts and six rank high pass parts have all adopted the cascaded structure of 3 second-order filter joints, and each second-order filter joint is provided with different Q values, can export according to circuit and regulate certain second-order filter joint separately, make that the production debugging is very convenient, improve the circuit precision; Output provides the difference way of output, can select for use according to practical situations; Internal resistance all adopts the thick-film technique printing, has reduced circuit area.Therefore, advantages such as this active band-pass filter has that volume is little, in light weight, integrated level is high, reliability is high, output noise is little, phase equalization and gain high conformity have very high practical value.
Description of drawings Fig. 1 is a theory diagram of the present utility model;
Fig. 2 is the theory diagram of six rank low pass filters of the present utility model;
Fig. 3 is the theory diagram of six rank high pass filters of the present utility model;
Fig. 4 is the utility model circuit theory diagrams
Embodiment is with reference to Fig. 1, and is of the present utility model, and embodiment is the both-end input, both-end output type state variable filter; Import the certain amplitude AC signal, export the sine wave signal of particular frequency range 15～20kHz again through filtering; It is made up of difference input circuit, six rank low pass filters, six rank high pass filters and differential output circuit.The difference input circuit is converted to single-ended signal with prime one input signal 1 and another input signal 2, and give back level six rank low pass filters, give six rank high pass filters through the low-pass signal of six rank low pass filters outputs, by differential output circuit single-ended signal is converted to output signal 1 and another output signal 2 more at last.Fig. 2 illustrates the utility model six rank low-pass filter circuit theory diagrams, is the second-order low-pass filter circuit of 3 series connection, finishes six rank low-pass filtering functions.The basic circuit structure of each second-order low-pass filter circuit is identical, but used resistance value is different fully, so the function that each second-order low-pass filter circuit is realized is different.Fig. 3 illustrates the utility model six rank high-pass filtering circuit theory diagrams, is the second order high-pass filtering circuit of 3 series connection, finishes six rank high pass filter function.Though the basic circuit structure of each second order high-pass filtering circuit is identical, used resistance value is different fully, so the function that each second order high-pass filtering circuit is realized is different.Described second-order low-pass filter circuit structure is identical with second order high-pass filtering circuit structure.With reference to Fig. 4, difference input circuit of the present utility model is negative input signal IN-through first capacitor C 1 and the anti-phase input pin 9 that meets operational amplifier IC1C after first resistance R 1 is connected; Positive input signal IN+ is through second capacitor C 2 and the homophase input pin 10 that meets operational amplifier IC1C after second resistance R 2 is connected; The anti-phase input pin 9 of the 3rd resistance R 3 one termination operational amplifier IC1C, the output pin 8 of another termination operational amplifier IC1C; The 4th resistance R 4 one end ground connection, the homophase input pin 10 of another termination operational amplifier IC1C.Described first second-order low-pass filter circuit is the 11 resistance R the 11, the 12 resistance R 12 and the 3rd capacitor C 3 and first single operational amplifier IC1A composition integrating circuit; The 17 resistance R the 17, the 18 resistance R 18 and the second operational amplifier IC1B constitute an inverting amplifier; The 16 resistance R 16 and the 4th capacitor C 4 and the 3rd operational amplifier IC1D constitute inverting integrator; The 14 resistance R 14 produces negative feedback, is used for adjusting the trap frequency point; The 15 resistance R 15 produces positive feedback, can produce fine setting to gain.The output pin 8, the of the operational amplifier IC1C of the 11 resistance R 11 1 termination difference input circuits 11 anti-phase pin 2 of resistance R 11 another termination first operational amplifier IC1A wherein; With the 12 resistance R 12 1 terminations first operational amplifier IC1A output pin 1 of the 3rd capacitor C 3 parallel connections, the anti-phase input pin 2 of another termination first operational amplifier IC1A; The first operational amplifier IC1A homophase input pin, 3 ground connection; The anti-phase input pin 2 of the 13 resistance R 13 1 terminations, the first operational amplifier IC1A, another termination the 3rd operational amplifier IC1D output pin 14; The output pin 8, the of the operational amplifier IC1C of the 14 resistance R 14 1 termination difference input circuits 14 anti-phase input pins 6 of resistance R 14 another termination second operational amplifier IC1B; The output pin 8, the of the operational amplifier IC1C of the 15 resistance R 15 1 termination difference input circuits 15 anti-phase input pins 13 of resistance R 15 another termination the 3rd operational amplifier IC1D; The anti-phase input pin 13 of the 16 resistance R 16 1 terminations the 3rd operational amplifier IC1D, another termination second operational amplifier IC1B output pin 7, i.e. output; The 17 resistance R 17 1 terminations first operational amplifier IC1A output pin 1, the anti-phase input pin 6 of another termination second operational amplifier IC1B; The anti-phase input pin 6 of the 18 resistance R 18 1 terminations, the second operational amplifier IC1B, another termination second operational amplifier IC1B output pin 7; The 4th capacitor C 4 one terminations the 3rd operational amplifier IC1D output pin 14, the anti-phase input pin 13 of another termination the 3rd operational amplifier IC1D.Homophase input pin 12 ground connection of the 3rd operational amplifier IC1D, homophase input pin 5 ground connection of the second operational amplifier IC1B.Described second second-order low-pass filter circuit is the 21 resistance R the 21, the 22 resistance R 22 and the 5th capacitor C 5 and the 4th single operational amplifier IC2A composition integrating circuit; The 27 resistance R the 27, the 28 resistance R 28 and the 5th operational amplifier IC2B constitute an inverting amplifier; The 26 resistance R 26 and the 6th capacitor C 6 and the 6th operational amplifier IC2D constitute inverting integrator; The 24 resistance R 24 produces negative feedback, is used for adjusting the trap frequency point; The 25 resistance R 25 produces positive feedback, can produce fine setting to gain; The 21 resistance R 21 and the second operational amplifier IC1B output pin 7 join.Described the 3rd second-order low-pass filter circuit is the 31 resistance R the 31, the 32 resistance R 32 and the 7th capacitor C 7 and the 7th single operational amplifier IC3A composition integrating circuit; The 37 resistance R the 37, the 38 resistance R 38 and the 8th operational amplifier IC3B constitute an inverting amplifier; The 36 resistance R 36 and the 8th capacitor C 8 and the 9th operational amplifier IC3D constitute inverting integrator; The 34 resistance R 34 produces negative feedback, is used for adjusting the trap frequency point; The 35 resistance R 35 produces positive feedback, can produce fine setting to gain; The output pin 7 of the 31 resistance R 31 1 terminations the 5th operational amplifier IC2B.Described first second order high-pass filtering circuit is the 41 resistance R the 41, the 42 resistance R 42 and the 9th capacitor C 9 and the tenth single operational amplifier IC4A composition integrating circuit; The 47 resistance R the 47, the 48 resistance R 48 and the 11 operational amplifier IC4B constitute an inverting amplifier; The 46 resistance R 46 and the tenth capacitor C 10 and the 12 operational amplifier IC4D constitute inverting integrator; The 44 resistance R 44 produces negative feedback, is used for adjusting the trap frequency point; The 45 resistance R 45 produces positive feedback, can produce fine setting to gain; The output pin 7 of the 41 resistance R 41 1 terminations the 8th operational amplifier IC3B.Described second second order high-pass filtering circuit is the 51 resistance R the 51, the 52 resistance R 52 and the 11 capacitor C the 11 and the 13 single operational amplifier IC5A composition integrating circuit; The 57 resistance R the 57, the 58 resistance R 58 and the tenth four-operational amplifier IC5B constitute an inverting amplifier; The 56 resistance R 56 and the 12 capacitor C 12 and the 15 operational amplifier IC5D constitute inverting integrator; The 54 resistance R 14 produces negative feedback, is used for adjusting the trap frequency point; The 55 resistance R 55 produces positive feedback, can produce fine setting to gain; The 51
The output pin 7 of resistance R 51 1 terminations the 11 operational amplifier IC4B.Described the 3rd second order high-pass filtering circuit is the 61 resistance R the 61, the 62 resistance R 62 and the 13 capacitor C the 13 and the 16 single operational amplifier IC6A composition integrating circuit; The 67 resistance R the 67, the 68 resistance R 68 and the 17 operational amplifier IC6B constitute an inverting amplifier; The 66 resistance R 66 and the 14 capacitor C 14 and the 18 operational amplifier IC6D constitute inverting integrator; The 64 resistance R 64 produces negative feedback, is used for adjusting the trap frequency point; The 65 resistance R 65 produces positive feedback, can produce fine setting to gain; The output pin 7 of the 61 resistance R 61 1 terminations the tenth four-operational amplifier IC5B.The output pin 7 of the 17 operational amplifier IC6B joins with the 5th resistance one end of differential output circuit, also joins with an output signal cout1 end; The other end of the 5th resistance R 5 and the anti-phase input pin 9 of the 19 operational amplifier IC6C join; The 6th resistance R 6 one ends and the anti-phase input pin 9 of the 19 operational amplifier IC6C join, and the other end and the 19 operational amplifier IC6C output pin 8 join; The 19 operational amplifier IC6C homophase input pin is through the 7th resistance R 7 ground connection, and the output pin 8 of the 19 operational amplifier IC6C connects another output signal cout2 end.Its basic principle is: input certain amplitude difference AC signal, through differential input stage the prime input signal is converted to single-ended signal, give the low-pass signal that back level six rank low pass filters produce certain cut-off frequency again, form the logical output signal of band through six rank high pass filters then, be converted to double-end signal output by the difference output-stage circuit at last.The utility model circuit adopts multichip IC design, thermal design, and reliability design.Specific as follows: the utility model product casing is selected the hermetically sealed metal structure of the dual-in-line that is made of outer pin, housing and cover plate for use, and wherein: outer pin is gold-plated, housing nickel plating, adopts the parallel seam welding sealing, and inflated with nitrogen protection in shell.Inner surface mount elements comprises bare chip and other chip components, and inner bare chip adopts the gold ball bonding bonding, and ceramics is Al
2O
3Ceramic substrate, conduction band and resistance adopt the thick film silk-screen printing technique.
IC1C among the utility model Fig. 4, IC6C, IC1A, IC1B, IC1D, IC2A, IC2B, IC2D, IC3A, IC3B, IC3D, IC4A, IC4B, IC4D, IC5A, IC5B, IC5D, IC6A, IC6B, IC6D are single operational amplifier, and its model is LF147.
The utility model component parameters: the capacitor C 1=C2=1 μ F among Fig. 4 in the difference input circuit, resistance R 1=R2=R3=R4=10k Ω.Capacitor C 3=C4=470pF in first second-order low-pass filter circuit, resistance R 11=52.45k Ω R12=16.73k Ω R13=24.18k Ω R14=52.56k Ω R15=24.18k Ω R16=24.18k Ω R17=R18=16.76k Ω; Capacitor C 5=C6=470pF in second second-order low-pass filter circuit, resistance R 21=91.24k Ω R22=35.42 Ω R23=17.90k Ω R24=43.21k Ω R25=17.91k Ω R26=17.90k Ω R27=R28=16.77k Ω; Capacitor C 7=C8=470pF in the 3rd second-order low-pass filter circuit, resistance R 31=1857.89k Ω R32=151.80k Ω R33=16.18k Ω R34=205.27k Ω R35=16.19k Ω R36=16.18k Ω R37=R38=16.77k Ω.Capacitor C 9=C10=680pF in first second order high-pass filtering circuit, resistance R 41=R42=7.39k Ω R43=10.68k Ω R44=15.40k Ω R45=33.47k Ω R46=10.68k Ω R47=R48=15.40k Ω; Capacitor C 11=C12=680pF in second second order high-pass filtering circuit, resistance R 51=R52=28.54k Ω R53=14.42k Ω R54=15.40k Ω R55=37.15k Ω R56=14.42k Ω R57=R58=15.40k Ω; Capacitor C 13=C14=680pF in the 3rd second order high-pass filtering circuit, resistance R 61=R62=149.67k Ω R63=15.95k Ω R64=15.40k Ω R65=195.25k Ω R66=15.95k Ω R67=R68=15.40k Ω.Resistance R 5=R6=10k Ω R7=5k Ω in the differential output circuit.
Claims (5)
1. active state variable band pass filter is characterized in that: be made up of difference input circuit, six rank low pass filters, six rank high pass filters and differential output circuit; Described difference input circuit is converted to single-ended signal with prime one input signal 1 and another input signal 2, and give six rank low pass filters, give six rank high pass filters through the low-pass signal of six rank low pass filters output, by differential output circuit single-ended signal is converted to output signal 1 and another output signal 2 more at last.
2. active state variable band pass filter according to claim 1 is characterized in that: described six rank low-pass filter circuits are that the second-order low-pass filter circuit by 3 series connection constitutes.
3. according to active state variable band pass filter as claimed in claim 1, it is characterized in that: described six rank high-pass filtering circuits are that the second order high-pass filtering circuit by 3 series connection constitutes.
4. according to claim 2 or 3 described active state variable band pass filters, it is characterized in that: described second-order low-pass filter circuit structure is identical with second order high-pass filtering circuit structure.
5. active state variable band pass filter according to claim 4 is characterized in that: negative input signal (IN-) is through first electric capacity (C1) of difference input circuit and the anti-phase input pin (9) that connects operational amplifier (IC1C) after first resistance (R1) is connected; Positive input signal (IN+) is through second electric capacity (C2) and the homophase input pin (10) that connects operational amplifier (IC1C) after second resistance (R2) is connected; The anti-phase input pin (9) of the 3rd resistance (R3) termination operational amplifier (IC1C), the output pin (8) of another termination operational amplifier (IC1C); The 4th resistance (R4) end ground connection, the homophase input pin (10) of another termination operational amplifier (IC1C); Described first second-order low-pass filter circuit is the 11 resistance (R11), the 12 resistance (R12) and the 3rd electric capacity (C3) and first single operational amplifier (IC1A) composition integrating circuit; The 17 resistance (R17), the 18 resistance (R18) and second operational amplifier (IC1B) constitute an inverting amplifier; The 16 resistance (R16) and the 4th electric capacity (C4) constitute inverting integrator with the 3rd operational amplifier (IC1D); The 14 resistance (R14) produces negative feedback, is used for adjusting the trap frequency point; The 15 resistance (R15) produces positive feedback, can produce fine setting to gain; The output pin (8) of the operational amplifier (IC1C) of the 11 resistance (R11) termination difference input circuit wherein, another anti-phase pin of termination first operational amplifier (IC1A) (2) of the 11 resistance (R11); Ten two resistance (R12) termination first operational amplifier (IC1A) output pin (1) in parallel with the 3rd electric capacity (C3), another anti-phase input pin of termination first operational amplifier (IC1A) (2); First operational amplifier (IC1A) homophase input pin (3) ground connection; The anti-phase input pin of the 13 resistance (R13) termination first operational amplifier (IC1A) (2), another termination the 3rd operational amplifier (IC1D) output pin (14); The output pin (8) of the operational amplifier (IC1C) of the 14 resistance (R14) termination difference input circuit, another anti-phase input pin of termination second operational amplifier (IC1B) (6) of the 14 resistance (R14); The output pin (8) of the operational amplifier (IC1C) of the 15 resistance (R15) termination difference input circuit, another anti-phase input pin of termination the 3rd operational amplifier (IC1D) (13) of the 15 resistance (R15); The anti-phase input pin of the 16 resistance (R16) termination the 3rd operational amplifier (IC1D) (13), another termination second operational amplifier (IC1B) output pin (7), i.e. output; The 17 resistance (R17) termination first operational amplifier (IC1A) output pin (1), another anti-phase input pin of termination second operational amplifier (IC1B) (6); The anti-phase input pin of the 18 resistance (R18) termination second operational amplifier (IC1B) (6), another termination second operational amplifier (IC1B) output pin (7); The 4th electric capacity (C4) termination the 3rd operational amplifier (IC1D) output pin (14), another anti-phase input pin of termination the 3rd operational amplifier (IC1D) (13); Homophase input pin (12) ground connection of the 3rd operational amplifier (IC1D), homophase input pin (5) ground connection of second operational amplifier (IC1B); Described second second-order low-pass filter circuit is the 21 resistance (R21), the 22 resistance (R22) and the 5th electric capacity (C5) and the 4th single operational amplifier (IC2A) composition integrating circuit; The 27 resistance (R27), the 28 resistance (R28) and the 5th operational amplifier (IC2B) constitute an inverting amplifier; The 26 resistance (R26) and the 6th electric capacity (C6) constitute inverting integrator with the 6th operational amplifier (IC2D); The 24 resistance R 24 produces negative feedback, is used for adjusting the trap frequency point; The 25 resistance (R25) produces positive feedback, can produce fine setting to gain; The 21 resistance (R21) joins with second operational amplifier (IC1B) output pin (7); Described the 3rd second-order low-pass filter circuit is the 31 resistance (R31), the 32 resistance (R32) and the 7th electric capacity (C7) and the 7th single operational amplifier (IC3A) composition integrating circuit; The 37 resistance (R37), the 38 resistance (R38) and the 8th operational amplifier (IC3B) constitute an inverting amplifier; The 36 resistance (R36) and the 8th electric capacity (C8) constitute inverting integrator with the 9th operational amplifier (IC3D); The 34 resistance (R34) produces negative feedback, is used for adjusting the trap frequency point; The 35 resistance (R35) produces positive feedback, can produce fine setting to gain; The output pin (7) of the 31 resistance (R31) termination the 5th operational amplifier (IC2B); Described first second order high-pass filtering circuit is the 41 resistance (R41), the 42 resistance (R42) and the 9th electric capacity (C9) and the tenth operational amplifier (IC4A) composition integrating circuit; The 47 resistance (R47), the 48 resistance (R48) and the 11 operational amplifier (IC4B) constitute an inverting amplifier; The 46 resistance (R46) and the tenth electric capacity (C10) constitute inverting integrator with the 12 operational amplifier (IC4D); The 44 resistance (R44) produces negative feedback, is used for adjusting the trap frequency point; The 45 resistance (R45) produces positive feedback, can produce fine setting to gain; The output pin (7) of the 41 resistance (R41) termination the 8th operational amplifier (IC3B); Described second second order high-pass filtering circuit is the 51 resistance (R51), the 52 resistance (R52) and the 11 electric capacity (C11) and the 13 single operational amplifier (IC5A) composition integrating circuit; The 57 resistance (R57), the 58 resistance (R58) and the tenth four-operational amplifier (IC5B) constitute an inverting amplifier; The 56 resistance (R56) and the 12 electric capacity (C12) constitute inverting integrator with the 15 operational amplifier (IC5D); The 54 resistance (R54) produces negative feedback, is used for adjusting the trap frequency point; The 55 resistance (R55) produces positive feedback, can produce fine setting to gain; The output pin (7) of the 51 resistance (R51) termination the 11 operational amplifier (IC4B); Described the 3rd second order high-pass filtering circuit is the 61 resistance (R61), the 62 resistance (R62) and the 13 electric capacity (C13) and the 16 single operational amplifier (IC6A) composition integrating circuit; The 67 resistance (R67), the 68 resistance (R68) and the 17 operational amplifier (IC6B) constitute an inverting amplifier; The 66 resistance (R66) and the 14 electric capacity (C14) constitute inverting integrator with the 18 operational amplifier (IC6D); The 64 resistance (R64) produces negative feedback, is used for adjusting the trap frequency point; The 65 resistance (R65) produces positive feedback, can produce fine setting to gain; The output pin (7) of the 61 resistance (R61) termination the tenth four-operational amplifier (IC5B); The output pin (7) of the 17 operational amplifier (IC6B) joins with the 5th resistance (R5) end of differential output circuit, also joins with an output signal (cout1) end; The other end and the anti-phase input pin of the 19 operational amplifier (IC6C) (9) of the 5th resistance (R5) join; The 6th resistance (R6) end and the anti-phase input pin of the 19 operational amplifier (IC6C) (9) join, and the other end and the 19 operational amplifier (IC6C) output pin (8) join; The 19 operational amplifier (IC6C) homophase input pin is through the 7th resistance (R7) ground connection, and the output pin (8) of the 19 operational amplifier (IC6C) connects another output signal (cout2) end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202221022U CN201576938U (en) | 2009-12-15 | 2009-12-15 | Active state variable band-pass filter |
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| CN2009202221022U CN201576938U (en) | 2009-12-15 | 2009-12-15 | Active state variable band-pass filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703723A (en) * | 2014-11-29 | 2016-06-22 | 上海航空电器有限公司 | A potentiometer acquisition circuit with a two-stage filtering function |
| CN110365308A (en) * | 2019-07-05 | 2019-10-22 | 浙江大学 | A kind of tunable Active RC bandpass filter based on II type of Chebyshev |
-
2009
- 2009-12-15 CN CN2009202221022U patent/CN201576938U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703723A (en) * | 2014-11-29 | 2016-06-22 | 上海航空电器有限公司 | A potentiometer acquisition circuit with a two-stage filtering function |
| CN105703723B (en) * | 2014-11-29 | 2023-06-09 | 上海航空电器有限公司 | Potentiometer acquisition circuit with two-stage filtering function |
| CN110365308A (en) * | 2019-07-05 | 2019-10-22 | 浙江大学 | A kind of tunable Active RC bandpass filter based on II type of Chebyshev |
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Granted publication date: 20100908 Termination date: 20131215 |