CN102355228A - Multi-channel lowpass filter - Google Patents
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- CN102355228A CN102355228A CN2011102579602A CN201110257960A CN102355228A CN 102355228 A CN102355228 A CN 102355228A CN 2011102579602 A CN2011102579602 A CN 2011102579602A CN 201110257960 A CN201110257960 A CN 201110257960A CN 102355228 A CN102355228 A CN 102355228A
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- 230000003321 amplification Effects 0.000 claims abstract description 35
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 35
- 238000002955 isolation Methods 0.000 claims description 14
- 230000000087 stabilizing effect Effects 0.000 claims description 13
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 4
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- 238000005516 engineering process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
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Abstract
The invention discloses a multi-channel lowpass filter, which comprises a power supply module, a lowpass filtering control module and at least one path of filtering module, wherein the filtering module comprises a filtering input channel module, an active lowpass filtering module, a signal amplification module, a switch capacitor filtering module and a filtering output channel module; the power supply module is respectively connected with the lowpass filtering control module, the active lowpass filtering module, a signal amplification module and a switch capacitor filtering module; the filtering input channel module is connected with the active lowpass filtering module; the active lowpass filtering module is connected with the signal amplification module; the signal amplification module is connected with the switch capacitor filtering module; the lowpass filtering control module is connected with the switch capacitor filtering module; and the switch capacitor filtering module is connected with the lowpass output channel module. The multi-channel lowpass filter has the advantages of large noise margin, strong anti-jamming capability, high precision, low cutoff frequency, small amplitude fluctuation during frequency response and high stability.
Description
Technical field
The present invention relates to a kind of low pass filter, especially relate to a kind of multichannel low pass filter.
Background technology
The multichannel low pass filter can transmit the useful frequency content in the input signal, decays or suppresses useless frequency content; Traditional multichannel low pass filter mainly contains Butterworth filter, Chebyshev filter and elliptic filter, and the three has different passbands and transition band characteristic; Elliptic filter is with respect to Butterworth filter, and its transition band is more precipitous, and phase-frequency characteristic is relatively poor; Chebyshev filter is with respect to Butterworth filter, and its transition band is narrower, and phase-frequency characteristic is also relatively poor; Along with safety in production field and the raising of monitoring signal filtering requirement in the detection range, the cut-off frequency of traditional multichannel low pass filter is higher relatively, and its filtering accuracy and stability more and more can not meet the demands; And Butterworth LPF has good Frequency Response on passband, has obtained development fast and uses widely at safety in production field such as bridge, dam, skyscraper, tunnel, highway, electric power, petrochemical industry, fire-fighting and HVAC and monitoring detection range.
Summary of the invention
Technical problem to be solved by this invention provides that a kind of cut-off frequency is low, precision is high, amplitude fluctuation is little during frequency response, stability is high, is applicable to the multichannel low pass filter of safety in production field and monitoring detection range.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of multichannel low pass filter; Comprise power module; Also comprise low-pass filtering control module and at least one road filtration module; Described filtration module comprises filtering input channel module; The active low-pass filter module; The signal amplification module; Switch-capacitor filtering module and filtering output channel module; Described power module respectively with described low-pass filtering control module; Described active low-pass filter module; Described signal amplification module is connected with described switch-capacitor filtering module; The signal output part of described filtering input channel module is connected with the signal input part of described active low-pass filter module; The signal output part of described active low-pass filter module is connected with the signal input part of described signal amplification module; The signal output part of described signal amplification module is connected with the signal input part of described switch-capacitor filtering module; The signal output part of described low-pass filtering control module is connected with the control end of described switch-capacitor filtering module, and the signal output part of described switch-capacitor filtering module is connected with described filtering output channel module.
Described active low-pass filter module is by the first amplifier chip; The second amplifier chip; First resistance; Second resistance; First electric capacity; Second electric capacity and first variable capacitance diode are formed; The in-phase signal input of the described first amplifier chip is connected with an end of described first resistance; The other end of described first resistance is connected with the anode of described first variable capacitance diode; The minus earth of described first variable capacitance diode; The inversion signal input of the described first amplifier chip is connected with the signal output part of the described first amplifier chip; The signal output part of the described first amplifier chip is connected through the in-phase signal input of described second resistance with the described second amplifier chip; The in-phase signal input of the described second amplifier chip is through first capacity earth; The inversion signal input of the described second amplifier chip is connected with the signal output part of the described second amplifier chip; The inversion signal input of the described first amplifier chip is connected with the signal output part of the described second amplifier chip through described second electric capacity; The negative voltage input of the negative voltage input of the described first amplifier chip and the described second amplifier chip inserts respectively-12V voltage, and the positive voltage input of the positive voltage input of the described first amplifier chip and the described second amplifier chip inserts respectively+12V voltage.
Described signal amplification module is by the 3rd amplifier chip; The 3rd resistance; The 4th resistance; First rheostat and the 3rd electric capacity are formed; The in-phase signal input of described the 3rd amplifier chip is connected with described the 3rd resistance; The in-phase signal input of described the 3rd amplifier chip is through described the 3rd capacity earth; The inversion signal input of described the 3rd amplifier chip is through described the 4th grounding through resistance; The inversion signal input of described the 3rd amplifier chip is connected with the signal output part of described the 3rd amplifier chip through described first rheostat; The positive voltage input access+12V voltage of described the 3rd amplifier chip, the negative voltage input access-12V voltage of described the 3rd amplifier chip.
Described low-pass filtering control module is by first single row's pin terminal; Second single row's pin terminal; The 3rd single row's pin terminal; The 4th single row's pin terminal; The pin connector; Microprocessor chip and peripheral circuit are formed; Described first single row's pin terminal is connected with described microprocessor chip; Described second single row's pin terminal is connected with described microprocessor chip; The described the 3rd single row's pin terminal is connected with described microprocessor chip; The described the 4th single row's pin terminal is connected with described microprocessor chip, and described microprocessor chip is connected with described pin connector.
Described switch-capacitor filtering module is made up of switch-capacitor filtering chip and peripheral circuit.
Described power module is made up of voltage stabilizing circuit, the first inductance isolation and capacitor filter, the second inductance isolation and capacitor filter, the 3rd inductance isolation and capacitor filter, the 4th inductance isolation and capacitor filter, voltage conversion circuit and binding post, and described voltage stabilizing circuit is that voltage stabilizing chip and peripheral circuit are formed by model.
Be provided with the voltage follow module between described signal amplification module and the described switch-capacitor filtering module; The signal input part of described voltage follow module is connected with the signal output part of described signal amplification module; The signal output part of described voltage follow module is connected with the signal input part of described switch-capacitor filtering module, and the power input of described voltage follow module is connected with described power module.
Described voltage follow module is by the four high guaily unit chip; The 6th resistance; The 7th resistance; The 8th resistance; The 4th electric capacity and second variable capacitance diode are formed; The in-phase signal input of described four high guaily unit chip is through described the 8th grounding through resistance; The inversion signal input of described four high guaily unit chip is connected with an end of described the 7th resistance; The other end of described the 7th resistance is through described the 4th capacity earth; The inversion signal input of described four high guaily unit chip is connected with the signal output part of described four high guaily unit chip through described the 6th resistance; The signal output part of described four high guaily unit chip is connected with the anode of described second variable capacitance diode, the minus earth of described second variable capacitance diode.
Compared with the prior art, the present invention has the advantages that: the input signal after filtering of the input channel module transmitted to active low-pass filter module, active low-pass filter module receives the voltage signal to the signal amplification module, the signal amplification amplified and transmitted to the module is switched capacitor filter module, a low-pass filter control module control signal to the PWM output switched capacitor filter module, the switched capacitor filter module the received signal amplification module and the PWM wave signal transmission control signal when a compare match , inhibit or attenuate unwanted frequency components, the useful frequency components of the output to the filter output channel module, a low-pass filter; wherein the active low-pass filter module using a low-pass filter circuit Bath Water extract the useful signal in the input signal suppression noise, low frequency signal amplification module can enlarge small signal waveforms, the switch capacitor filter module used in the LTC-1164? 5CSW chip, with high accuracy and low angular frequency drift coefficients of the frequency response of amplitude fluctuation overcome with high stability, and monitoring of production areas to meet the security needs in the area detected; Also, if the signal amplification module and switched-capacitor filter module is disposed between the voltage follower module, you can play the role of isolation buffer, eliminating the load change effects on the output signal to further enhance stability.
Description of drawings
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is the circuit theory diagrams of power module of the present invention;
Fig. 3 is the circuit theory diagrams of filtering input channel module of the present invention;
Fig. 4 is the circuit theory diagrams of active low-pass filter module of the present invention;
Fig. 5 is the circuit theory diagrams of signal amplification module of the present invention;
Fig. 6 is the circuit theory diagrams of low-pass filtering control module of the present invention;
Fig. 7 is the circuit theory diagrams of switch-capacitor filtering module of the present invention;
Fig. 8 is the circuit theory diagrams of filtering output channel module of the present invention;
Fig. 9 is the circuit theory diagrams of voltage follow module of the present invention.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
As shown in Figure 1; A kind of multichannel low pass filter; Comprise power module 1; Low-pass filtering control module 6 and at least one road filtration module; Filtration module comprises filtering input channel module 2; Active low-pass filter module 3; Signal amplification module 4; Switch-capacitor filtering module 7 and filtering output channel module 8; Power module 1 respectively with low-pass filtering control module 6; Active low-pass filter module 3; Signal amplification module 4 is connected with switch-capacitor filtering module 7; The signal output part of filtering input channel module 2 is connected with the signal input part of active low-pass filter module 3; The signal output part of active low-pass filter module 3 is connected with the signal input part of signal amplification module 4; The signal output part of signal amplification module 4 is connected with the signal input part of switch-capacitor filtering module 7; The signal output part of low-pass filtering control module 6 is connected with the control end of switch-capacitor filtering module 7, and the signal output part of switch-capacitor filtering module 7 is connected with filtering output channel module 8.
In the above-mentioned specific embodiment; As shown in Figure 2; Power module 1 is made up of the binding post J1 of voltage stabilizing circuit 13, the isolation of first inductance and capacitor filter 9, the isolation of second inductance and capacitor filter 10, the isolation of the 3rd inductance and capacitor filter 11, the isolation of the 4th inductance and capacitor filter 12, voltage conversion circuit 14 and 6Pin; Voltage stabilizing circuit 13 is made up of voltage stabilizing chip U3 and peripheral circuit, and wherein voltage stabilizing chip U3 is that model is the integrated chip of L7805; The voltage output end of voltage stabilizing chip U3 is connected with low-pass filtering control module 6; Voltage conversion circuit 14 comprises eight respectively a resistance and the electronic circuit that electric capacity is formed by connecting; Each electronic circuit converts the current signal that receives into voltage signal+12Vna; + 12Vnb; + 12Vnc; + 12Vnd;-12Vna;-12Vnb;-12Vnc;-12Vnd (wherein n >=1) exports respectively, and power module 1 provides respectively that active low-pass filtering module 3, signal amplification module 4, low-pass filtering control module 6 and switch-capacitor filtering module 7 need ± 12V voltage and ± 5V voltage.
In the above-mentioned specific embodiment, as shown in Figure 3, filtering input channel module 2 is made up of the binding post J2 of 2pin, and binding post J2 inserts input signal Si nglen (wherein n >=1).
In the above-mentioned specific embodiment; As shown in Figure 4; Active low-pass filter module 3 adopts second order Butterworth filter circuit; By the first amplifier chip A1; The second amplifier chip A2; First resistance R 1; Second resistance R 2; First capacitor C 1; Second capacitor C 2 and the first variable capacitance diode D1 form; Wherein the first amplifier chip A1 and the second amplifier chip A2 are respectively the integrated chip that model is OP177; In-phase signal input+IN of the first amplifier chip A1 is connected with an end of first resistance R 1; The other end of first resistance R 1 inserts input signal Si nglen (wherein n >=1) and is connected with the anode of the first variable capacitance diode D1; The minus earth of the first variable capacitance diode D1; Inversion signal input-IN of the first amplifier chip A1 is connected with the signal output part OUT of the first amplifier chip A1; The signal output part OUT of the first amplifier chip A1 is connected with in-phase signal input+IN of the second amplifier chip A2 through second resistance R 2; In-phase signal input+IN of the second amplifier chip A2 is through first capacitor C, 1 ground connection; Inversion signal input-IN of the second amplifier chip A2 is connected with the signal output part OUT of the second amplifier chip A2; Inversion signal input-IN of the first amplifier chip A1 is connected with the signal output part OUT of the second amplifier chip A2 through second capacitor C 2; The signal output part OUT output signal FIRVinn (wherein n >=1) of the second amplifier chip A2; The negative voltage input V-of the negative voltage input V-of the first amplifier chip A1 and the second amplifier chip A2 inserts respectively-12V voltage, and the positive voltage input V+ of the positive voltage input V+ of the first amplifier chip A1 and the second amplifier chip A2 inserts respectively+12V voltage.
In the above-mentioned specific embodiment; As shown in Figure 5; Signal amplification module 4 is by the 3rd amplifier chip A3; The 3rd resistance R 3; The 4th resistance R 4; The first rheostat B1 and the 3rd capacitor C 3 are formed; Wherein the 3rd amplifier chip A3 is that model is the integrated chip of OP177; In-phase signal input+IN of the 3rd amplifier chip A3 is connected with an end of the 3rd resistance R 3; The other end of the 3rd resistance R 3 inserts the output signal FIRVinn (wherein n >=1) of active low-pass filtering module 3; In-phase signal input+IN of the 3rd amplifier chip A3 is through the 3rd capacitor C 3 ground connection; Inversion signal input-IN of the 3rd amplifier chip A3 is through the 4th resistance R 4 ground connection; Inversion signal input-IN of the 3rd amplifier chip A3 is connected with the signal output part OUT of the 3rd amplifier chip A3 through the first rheostat B1; The signal output part OUT output signal FIRVoutn (wherein n >=1) of the 3rd amplifier chip A3; The positive voltage input V+ access+12V voltage of the 3rd amplifier chip A3, the negative voltage input V-access-12V voltage of the 3rd amplifier chip.
In the above-mentioned specific embodiment; As shown in Figure 6; Low-pass filtering control module 6 is by first single row's pin terminals P 1; Second single row's pin terminals P 2; The 3rd single row's pin terminals P 3; The 4th single row's pin terminals P 4; Pin connector P5; Microprocessor chip U1 and peripheral circuit are formed; First single row's pin terminals P 1 wherein; Second single row's pin terminals P 2; The 3rd single row's pin terminals P the 3 and the 4th single row's pin terminals P 4 is respectively the terminal that model is Header 8H; Pin connector P5 is that model is the pin connector of AVRISP10; Microprocessor chip U1 is that model is the integrated chip of Atmega128; The pin8 of first single row's pin terminals P 1 ~ pin1 end is held corresponding connection with PB0 ~ PB7 of Atmega128 chip U1; The pin8 of second single row's pin terminals P 2 ~ pin1 end is connected with PC0 ~ PC7 end of Atmega128 chip U1; The pin8 of the 3rd single row's pin terminals P 3 ~ pin1 end is connected with PD0 ~ PD7 end of Atmega128 chip U1; The pin8 of the 4th single row's pin terminals P 4 ~ pin1 end is connected with PE0 ~ PE7 end of Atmega128 chip U1; The PB1 of Atmega128 chip U1; PE0; PE1 and VCC end are connected with the respective end of AVRISP10 pin connector P5 respectively; Wherein peripheral circuit is mainly by the crystal oscillator Z1 of 4mHz; The 9th resistance R 9 and the 5th capacitor C 5 are formed; The power end VCC of crystal oscillator Z1 connects the voltage output end of the voltage stabilizing chip U3 in the voltage stabilizing circuit 13; The output OUT of crystal oscillator Z1 connects the XTAL1 end of the chip U1 of Atmega128; One end of the 9th resistance R 9 is connected with an end of the 5th capacitor C 5; Its public connecting end inserts the RESET end of Atmega128 chip U1; The 9th resistance R 9 another termination VCC; The other end ground connection of the 5th capacitor C 5, Atmega128 chip U1 output PWM wave control signal control switch capacitor filtering module 7 is carried out filtering.
In the above-mentioned specific embodiment, like Fig. 7 and shown in Figure 8, switch-capacitor filtering module 7 is by the switch-capacitor filtering chip
U2 and peripheral circuit are formed; Wherein switch-capacitor filtering chip U2 is that model is the integrated chip of LTC-11645CSW; Filtering output channel module 8 is made up of the binding post J3 of 2pin; After switch-capacitor filtering module 7 receives the output signal of PWM wave control signal and signal amplification module 4 of low-pass filtering control module 6 transmission; Behind the output signal and PWM wave control signal coupling of LTC-11645CSW chip U2 with the signal amplification module 4 that receives; Export useful frequency content to binding post J3; Realize LPF; Wherein the angular frequency precision of LTC-11645CSW chip U2 can reach 0.03%, and temperature is floated coefficient can reach 0.0002DB/ ℃.
The particular embodiment, the signal amplification module 4 and the switched capacitor filter module 7 may also be provided between the voltage follower module 5, the voltage follower power input module 5 and the power supply module 1 is connected, and voltage follower module 5 and the signal input terminal Signal amplification module 4 signal output terminal, the voltage follower module 5 and the signal output terminal of the switched capacitor filter module 7 is connected to a signal input terminal, the voltage follower module 5 receives the signal transmitted signal amplification module 4, the signal isolation buffer, eliminate the effect of load change transferred to the switched capacitor filter in the filter processing module 7, and further enhance the accuracy and stability of the filtered signal; voltage follower module 5 from the fourth op-amp chip A4, sixth resistor R6, the seventh resistor R7 , the eighth resistor R8, the fourth capacitor C4 and a varactor diode D2, the second, the fourth operational amplifier A4 is model OP177 chip integrated chip, the fourth operational amplifier A4 chip inphase signal through the first input terminal + IN eight resistor R8 to ground, a fourth inverting op-amp chip A4-IN signal input terminal of the seventh resistor R7 is connected to one end, the other end of the seventh resistor R7 is grounded through the fourth capacitor C4, the fourth operational amplifier A4 chip counter -IN-phase signal input terminal of the fourth through the sixth resistor R6 A4 op-amp chip signal output terminal OUT, the fourth operational amplifier A4 chip signal output terminal OUT of the second anode of the varactor diode D2 is connected to a second variable cathode of varactor diode D2 is grounded.
Claims (8)
1. multichannel low pass filter; Comprise power module; It is characterized in that also comprising low-pass filtering control module and at least one road filtration module; Described filtration module comprises filtering input channel module; The active low-pass filter module; The signal amplification module; Switch-capacitor filtering module and filtering output channel module; Described power module respectively with described low-pass filtering control module; Described active low-pass filter module; Described signal amplification module is connected with described switch-capacitor filtering module; The signal output part of described filtering input channel module is connected with the signal input part of described active low-pass filter module; The signal output part of described active low-pass filter module is connected with the signal input part of described signal amplification module; The signal output part of described signal amplification module is connected with the signal input part of described switch-capacitor filtering module; The signal output part of described low-pass filtering control module is connected with the control end of described switch-capacitor filtering module, and the signal output part of described switch-capacitor filtering module is connected with described filtering output channel module.
2. a kind of multichannel low pass filter according to claim 1; It is characterized in that described active low-pass filter module is by the first amplifier chip; The second amplifier chip; First resistance; Second resistance; First electric capacity; Second electric capacity and first variable capacitance diode are formed; The in-phase signal input of the described first amplifier chip is connected with an end of described first resistance; The other end of described first resistance is connected with the anode of described first variable capacitance diode; The minus earth of described first variable capacitance diode; The inversion signal input of the described first amplifier chip is connected with the signal output part of the described first amplifier chip; The signal output part of the described first amplifier chip is connected through the in-phase signal input of described second resistance with the described second amplifier chip; The in-phase signal input of the described second amplifier chip is through first capacity earth; The inversion signal input of the described second amplifier chip is connected with the signal output part of the described second amplifier chip; The inversion signal input of the described first amplifier chip is connected with the signal output part of the described second amplifier chip through described second electric capacity; The negative voltage input of the negative voltage input of the described first amplifier chip and the described second amplifier chip inserts respectively-12V voltage, and the positive voltage input of the positive voltage input of the described first amplifier chip and the described second amplifier chip inserts respectively+12V voltage.
3. a kind of multichannel low pass filter according to claim 1; It is characterized in that described signal amplification module is by the 3rd amplifier chip; The 3rd resistance; The 4th resistance; First rheostat and the 3rd electric capacity are formed; The in-phase signal input of described the 3rd amplifier chip is connected with described the 3rd resistance; The in-phase signal input of described the 3rd amplifier chip is through described the 3rd capacity earth; The inversion signal input of described the 3rd amplifier chip is through described the 4th grounding through resistance; The inversion signal input of described the 3rd amplifier chip is connected with the signal output part of described the 3rd amplifier chip through described first rheostat; The positive voltage input access+12V voltage of described the 3rd amplifier chip, the negative voltage input access-12V voltage of described the 3rd amplifier chip.
4. a kind of multichannel low pass filter according to claim 1; It is characterized in that described low-pass filtering control module is by first single row's pin terminal; Second single row's pin terminal; The 3rd single row's pin terminal; The 4th single row's pin terminal; The pin connector; Microprocessor chip and peripheral circuit are formed; Described first single row's pin terminal is connected with described microprocessor chip; Described second single row's pin terminal is connected with described microprocessor chip; The described the 3rd single row's pin terminal is connected with described microprocessor chip; The described the 4th single row's pin terminal is connected with described microprocessor chip, and described microprocessor chip is connected with described pin connector.
5. a kind of multichannel low pass filter according to claim 1 is characterized in that described switch-capacitor filtering module is made up of switch-capacitor filtering chip and peripheral circuit.
6. according to the described a kind of multichannel low pass filter of claim 1; It is characterized in that described power module is made up of voltage stabilizing circuit, the first inductance isolation and capacitor filter, the second inductance isolation and capacitor filter, the 3rd inductance isolation and capacitor filter, the 4th inductance isolation and capacitor filter, voltage conversion circuit and binding post, described voltage stabilizing circuit is that voltage stabilizing chip and peripheral circuit are formed by model.
7. according to each described a kind of multichannel low pass filter in the claim 1 ~ 6; It is characterized in that being provided with the voltage follow module between described signal amplification module and the described switch-capacitor filtering module; The signal input part of described voltage follow module is connected with the signal output part of described signal amplification module; The signal output part of described voltage follow module is connected with the signal input part of described switch-capacitor filtering module, and the power input of described voltage follow module is connected with described power module.
8. a kind of multichannel low pass filter according to claim 7; It is characterized in that described voltage follow module is by the four high guaily unit chip; The 6th resistance; The 7th resistance; The 8th resistance; The 4th electric capacity and second variable capacitance diode are formed; The in-phase signal input of described four high guaily unit chip is through described the 8th grounding through resistance; The inversion signal input of described four high guaily unit chip is connected with an end of described the 7th resistance; The other end of described the 7th resistance is through described the 4th capacity earth; The inversion signal input of described four high guaily unit chip is connected with the signal output part of described four high guaily unit chip through described the 6th resistance; The signal output part of described four high guaily unit chip is connected with the anode of described second variable capacitance diode, the minus earth of described second variable capacitance diode.
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| CN201110257960.2A CN102355228B (en) | 2011-09-02 | 2011-09-02 | Multi-channel lowpass filter |
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| CN201110257960.2A CN102355228B (en) | 2011-09-02 | 2011-09-02 | Multi-channel lowpass filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108259021A (en) * | 2018-01-10 | 2018-07-06 | 广西师范大学 | A kind of CMOS broadbands distribution variable band-pass filter |
| CN108900176A (en) * | 2018-09-20 | 2018-11-27 | 无锡吉兴汽车声学部件科技有限公司 | A kind of adjustable bandpass filter of two channel central frequencies |
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| US20110084764A1 (en) * | 2009-10-08 | 2011-04-14 | Ioan Alexandru Salomie | Amplifier and signal filter |
| CN202218204U (en) * | 2011-09-02 | 2012-05-09 | 宁波杉工结构监测与控制工程中心有限公司 | Multi-channel low pass filter |
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| JP2005057332A (en) * | 2003-08-04 | 2005-03-03 | Tdk Corp | Filter apparatus and branching apparatus employing the same |
| CN2684463Y (en) * | 2004-01-19 | 2005-03-09 | 汤承昭 | Signal controlling circuit for household appliance security inspection instrument |
| CN201039087Y (en) * | 2007-02-06 | 2008-03-19 | 青岛海信电器股份有限公司 | An onboard power amplification circuit |
| US20110084764A1 (en) * | 2009-10-08 | 2011-04-14 | Ioan Alexandru Salomie | Amplifier and signal filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108259021A (en) * | 2018-01-10 | 2018-07-06 | 广西师范大学 | A kind of CMOS broadbands distribution variable band-pass filter |
| CN108900176A (en) * | 2018-09-20 | 2018-11-27 | 无锡吉兴汽车声学部件科技有限公司 | A kind of adjustable bandpass filter of two channel central frequencies |
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| CN102355228B (en) | 2014-03-12 |
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