CN203574616U - Multichannel low-pass filter with adjustable cut-off frequency and gain - Google Patents
Multichannel low-pass filter with adjustable cut-off frequency and gain Download PDFInfo
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Abstract
The utility model discloses a multichannel low-pass filter with adjustable cut-off frequency and gain. The multichannel low-pass filter comprises a power supply module, a low-pass filtering control module and at least a channel of filtering module. The multichannel low-pass filter is characterized in that the filtering module comprises a filtering input channel module, a voltage following module, a signal attenuation module, a level adjusting module, a signal amplification module, a switch capacitance filtering module and a filtering output channel module, an input signal is transmitted to the voltage following module through the filtering input channel module, the voltage following module transmits the received voltage signal to the signal attenuation module and then to the level adjusting module, the signal outputted by the level adjusting module is amplified by the signal amplification module and then is transmitted to the switch capacitance filtering module, the low-pass filtering control module outputs a PWM wave control signal to the switch capacitance filtering module, and after the received amplification signal and the PWM wave control signal are compared and matched by the switch capacitance filtering module, useful frequency components are outputted to the filtering output channel module so that low-pass filtering is realized.
Description
Technical field
The utility model relates to a kind of Multi-channel low pass filter, especially relates to a kind of cut-off frequency and the adjustable Multi-channel low pass filter of gain.
Background technology
Multi-channel low pass filter can transmit the useful frequency content in input signal, decays or suppresses useless frequency content.Traditional Multi-channel low pass filter mainly contains Butterworth filter, Chebyshev filter and elliptic filter, and three has different passbands and transition band characteristic.Wherein, Chebyshev filter is with respect to Butterworth filter, and its transition band is narrower, and phase-frequency characteristic is also poor; Elliptic filter is with respect to Butterworth filter, and its transition band is more precipitous, and phase-frequency characteristic is poor.Along with the raising that in safety in production field and monitoring detection field, signal filtering requires, the cut-off frequency of traditional Multi-channel low pass filter is relatively high, and its filtering accuracy and stability more and more can not meet the demands; And Butterworth filter has good Frequency Response in passband, match again the adjusting of adjustable level output and cut-off frequency, solve fixed cut-off frequency and fixing output level deficiency in actual applications, in the safety in production fields such as bridge, dam, skyscraper, tunnel, highway, electric power, petrochemical industry, fire-fighting and HVAC and monitoring detection field, obtained development fast and application widely.
Summary of the invention
Technical problem to be solved in the utility model is to provide that a kind of input range is wide, output level is adjustable, cut-off frequency within the specific limits adjustable, precision is high, amplitude fluctuation is little during frequency response, stability is high, is applicable to the Multi-channel low pass filter of safety in production field and monitoring detection field.
The utility model solves the problems of the technologies described above adopted technical scheme: a kind of cut-off frequency and the adjustable Multi-channel low pass filter of gain, comprise power module, low-pass filtering control module and at least one road filtration module, it is characterized in that described filtration module is by filtering input channel module, voltage follow module, signal attenuation module, level adjusting module, signal amplification module, switch-capacitor filtering module and filtering output channel module form, described power module respectively with described low-pass filtering control module, described voltage follow module, described signal attenuation module, described level adjusting 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 voltage follow module, the signal output part of described voltage follow module is connected with the signal input part of described signal attenuation module, the signal output part of described signal attenuation module is connected with the signal input part of described level adjusting module, the signal output part of described low-pass filtering control module is connected with the signal controlling end of described level adjusting module, the signal output part of described level adjusting 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 signal controlling end of described switch-capacitor filtering module, the signal output part of described switch-capacitor filtering module is connected with the signal input part of described filtering output channel module.
Described low-pass filtering control module is mainly comprised of micro-chip processor and peripheral circuit.
Described micro-chip processor is that model is the integrated chip of ATmega8L-8AC.
Described voltage follow module is by rectifier diode, the first operational amplifier, the first resistance, the second resistance, the 3rd resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity and the 5th electric capacity form, the positive terminal of described rectifier diode is connected with one end of described the 3rd electric capacity, its public connecting end is connected with the signal output part of described filtering input channel module, the negative pole end ground connection of described rectifier diode, the other end of the 3rd described electric capacity is connected with the in-phase signal input of one end of described the second resistance and described the first operational amplifier respectively, the other end ground connection of the second described resistance, the inversion signal input of the first described operational amplifier is connected with the signal output part of the first described operational amplifier, the positive voltage input of the first described operational amplifier respectively with one end of described the first resistance, one end of the first described electric capacity is connected with one end of the second described electric capacity, other end access+5V the voltage of the first described resistance, the equal ground connection of the other end of the other end of the first described electric capacity and the second described electric capacity, the negative voltage input of the first described operational amplifier respectively with one end of described the 3rd resistance, one end of the 4th described electric capacity is connected with one end of the 5th described electric capacity, other end access-5V the voltage of the 3rd described resistance, the equal ground connection of the other end of the other end of the 4th described electric capacity and the 5th described electric capacity.
Described signal attenuation module is by the second operational amplifier, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity and the 9th electric capacity form, one end of the 5th described resistance is connected with the signal output part of described voltage follow module, the other end of the 5th described resistance is connected with one end of the inversion signal input of described the second operational amplifier and described the 7th resistance respectively, the other end of the 7th described resistance is connected with the signal output part of the second described operational amplifier, the in-phase signal input of the second described operational amplifier is connected with one end of the 4th described resistance, the other end ground connection of the 4th described resistance, the positive voltage input of the second described operational amplifier respectively with one end of described the 6th resistance, one end of the 6th described electric capacity is connected with one end of the 7th described electric capacity, other end access+5V the voltage of the 6th described resistance, the equal ground connection of the other end of the other end of the 6th described electric capacity and the 7th described electric capacity, the negative voltage input of the second described operational amplifier respectively with one end of described the 8th resistance, one end of the 8th described electric capacity is connected with one end of the 9th described electric capacity, other end access-5V the voltage of the 8th described resistance, the equal ground connection of the other end of the other end of the 8th described electric capacity and the 9th described electric capacity.
Described level adjusting module is by the adjustable operational amplifier of high-gain, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the tenth electric capacity, the 11 electric capacity, the 12 electric capacity, the 13 electric capacity and the 14 electric capacity form, the signal input part of the described adjustable operational amplifier of high-gain is connected with the signal output part of described signal attenuation module, the ground end ground connection of the described adjustable operational amplifier of high-gain, a gain control end of the described adjustable operational amplifier of high-gain respectively with one end of described the tenth electric capacity, one end of the 9th described resistance is connected with the tenth described one end hindering, the equal ground connection of the other end of the other end of the tenth described electric capacity and the 9th described resistance, the positive voltage input of the described adjustable operational amplifier of high-gain respectively with the other end of described the tenth resistance, one end of the 11 described resistance, one end of the 11 described electric capacity is connected with one end of the 12 described electric capacity, other end access+5V the voltage of the 11 described resistance, the equal ground connection of the other end of the other end of the 11 described electric capacity and the 12 described electric capacity, the negative voltage input of the described adjustable operational amplifier of high-gain respectively with one end of described the 13 resistance, one end of the 13 described electric capacity is connected with one end of the 14 described electric capacity, other end access-5V the voltage of the 13 described resistance, the equal ground connection of the other end of the other end of the 13 described electric capacity and the 14 described electric capacity, the feedback end of the described adjustable operational amplifier of high-gain is connected with the signal output part of the described adjustable operational amplifier of high-gain by the 12 described resistance.
Described high-gain is adjustable, and operational amplifier is that model is the amplifier chip of AD603.
Described signal amplification module is by the 3rd operational amplifier, the 14 resistance, the 15 resistance, the 16 resistance, the 17 resistance, the 18 resistance, the 15 electric capacity, the 16 electric capacity, the 17 electric capacity, the 18 electric capacity and the 19 electric capacity form, one end of the 14 described resistance is connected with the signal output part of described level adjusting module, the other end of the 14 described resistance respectively with one end of described the 15 electric capacity, the inversion signal input of the 3rd described operational amplifier is connected with one end of the 17 described resistance, the other end ground connection of the 15 described electric capacity, the other end of the 17 described resistance is connected with the signal output part of the 3rd described operational amplifier, the in-phase signal input of the 3rd described operational amplifier is connected with one end of the 15 described resistance, the other end ground connection of the 15 described resistance, the positive voltage input of the 3rd described operational amplifier respectively with one end of described the 16 resistance, one end of the 16 described electric capacity is connected with one end of the 17 described electric capacity, other end access+12V the voltage of the 16 described resistance, the equal ground connection of the other end of the other end of the 16 described electric capacity and the 17 described electric capacity, the negative voltage input of the 3rd described operational amplifier respectively with one end of described the 18 resistance, one end of the 18 described electric capacity is connected with one end of the 19 described electric capacity, other end access-12V the voltage of the 18 described resistance, the equal ground connection of the other end of the other end of the 18 described electric capacity and the 19 described electric capacity.
Described switch-capacitor filtering module is comprised of switch-capacitor filtering chip and peripheral circuit.
Described switch-capacitor filtering chip is that model is the integrated chip of LTC1164-5CSW.
Compared with prior art, the utility model has the advantage of: input signal after filtering input channel module is transferred to voltage follow module, voltage follow module is transferred to signal attenuation module by the voltage signal receiving, after signal attenuation module decay, be transferred to level adjusting module, after level adjusting module output signal, through signal amplification module, amplify again, then signal is transferred to switch-capacitor filtering module, low-pass filtering control module output PWM wave control signal is in switch-capacitor filtering module, switch-capacitor filtering module compares the signal being transmitted by signal amplification module receiving and the PWM wave control signal that transmitted by low-pass filtering control module after coupling, suppress or the useless frequency content that decays, export useful frequency content to filtering output channel module, realized low-pass filtering, wherein voltage follow module can be extracted useful signal as much as possible, suppress the noise jamming in input signal, signal attenuation module can reduce the amplitude of signal and export to level adjusting module, level adjusting module can amplify low frequency small-signal waveform through signal amplification module after adjusting level again, in switch-capacitor filtering module, adopted LTC1164-5CSW chip, there is higher angular frequency precision and lower temperature and float coefficient, amplitude fluctuation while having overcome frequency response, there is higher stability, met well the demand of safety in production field and monitoring detection field.
Accompanying drawing explanation
Fig. 1 is the composition frame chart of the adjustable Multi-channel low pass filter of cut-off frequency of the present utility model and gain;
Fig. 2 is the circuit diagram of the low-pass filtering control module in the adjustable Multi-channel low pass filter of cut-off frequency of the present utility model and gain;
Fig. 3 is voltage follow module in cut-off frequency of the present utility model and the adjustable Multi-channel low pass filter of gain and the circuit diagram of signal attenuation module;
Fig. 4 is the circuit diagram of the level adjusting module in the adjustable Multi-channel low pass filter of cut-off frequency of the present utility model and gain;
Fig. 5 is the circuit diagram of the signal amplification module in the adjustable Multi-channel low pass filter of cut-off frequency of the present utility model and gain;
Fig. 6 is the circuit diagram of the switch-capacitor filtering module in the adjustable Multi-channel low pass filter of cut-off frequency of the present utility model and gain.
Embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the utility model.
A kind of cut-off frequency the utility model proposes and the adjustable Multi-channel low pass filter of gain, as shown in Figure 1, it comprises power module 1, low-pass filtering control module 2 and at least one road filtration module, filtration module is by filtering input channel module 3, voltage follow module 4, signal attenuation module 5, level adjusting module 6, signal amplification module 7, switch-capacitor filtering module 8 and filtering output channel module 9 form, power module 1 respectively with low-pass filtering control module 2, voltage follow module 4, signal attenuation module 5, level adjusting module 6, signal amplification module 7 is connected with switch-capacitor filtering module 8, the signal output part of filtering input channel module 3 is connected with the signal input part of voltage follow module 4, the signal output part of voltage follow module 4 is connected with the signal input part of signal attenuation module 5, the signal output part of signal attenuation module 5 is connected with the signal input part of level adjusting module 6, the signal output part of low-pass filtering control module 2 is connected with the signal controlling end of level adjusting module 6, the signal output part of level adjusting module 6 is connected with the signal input part of signal amplification module 7, the signal output part of signal amplification module 7 is connected with the signal input part of switch-capacitor filtering module 8, the signal output part of low-pass filtering control module 2 is connected with the signal controlling end of switch-capacitor filtering module 8, the signal output part of switch-capacitor filtering module 8 is connected with the signal input part of filtering output channel module 9.During work, pending signal is input to voltage follow module 4 by filtering input channel module 3, the signal of the signal output part output of voltage follow module 4 is sent into signal attenuation module 5, 5 pairs of signals of signal attenuation module carry out a certain proportion of decay, signal after decay carries out level adjustment by level adjusting module 6, signal after level adjustment is sent into the filtering that switch-capacitor filtering module 8 carries out signal and is processed after amplifying by signal amplification module 7, filtered signal is finally from 9 outputs of filtering output channel module, magnification ratio at this signal amplification module 7 is identical with the attenuation ratio of signal attenuation module 5.
In this specific embodiment, as shown in Figure 2, low-pass filtering control module 2 is mainly comprised of micro-chip processor U1 and peripheral circuit, wherein, micro-chip processor U1 is that model is the integrated chip of ATmega8L-8AC, peripheral circuit is mainly by the active crystal oscillator X1 of 4M frequency, reset circuit and additional DA transducer form, the power end of active crystal oscillator X1 i.e. connect+5 voltages of the 4th pin, the power end of active crystal oscillator X1 is by capacitor C 3 ground connection, the ground end of active crystal oscillator X1 i.e. the 2nd pin ground connection, the signal output part of active crystal oscillator X1 i.e. the 3rd pin is connected with the integrated chip of ATmega8L-8AC.The 3rd pin of the external active crystal oscillator X1 of PB6 end of the integrated chip of ATmega8L-8AC, for system provides reliable and stable work clock; Its PC6 holds external reset circuit, can realize powers on automatically resets and two kinds of reset modes that manually button resets, the work that can guarantee control circuit steady ordered is same, reset circuit comprises a capacitor C 1, resistance R 3 and a reset switch S5 as shown in Figure 2, one termination of resistance R 3+5V voltage, the other end of resistance R 3 is connected with PC6 end, one end of reset switch S5 and one end of capacitor C 1 respectively, the equal ground connection of the other end of the other end of reset switch S5 and capacitor C 1; DA transducer is mainly comprised of DA conversion chip U2 and peripheral circuit as shown in Figure 2, the model of DA conversion chip U2 is TLV5618, to be SPI communication interface communicate by letter and with this, control DA transducer and export different voltage signals from peripheral DA transducer for the PB2 pin of micro-chip processor U1, PB3 pin, PB5 pin, the output OUTA of DA transducer is connected with the signal controlling end of level adjusting module 6, micro-chip processor U1 provides high-precision variable voltage by DA transducer, with this, comes the level of 6 pairs of signals of control level adjusting module to regulate.The PB1 pin of micro-chip processor U1 is connected with the signal controlling end of switch-capacitor filtering module 8, and this pin is realized output PWM wave control signal control switch capacitor filtering module 8 and carried out filtering, and by changing frequency, realizes the change of cut-off frequency.
In this specific embodiment, as shown in Figure 3, voltage follow module 4 is by rectifier diode T1, the first operational amplifier U101, the first resistance R 101, the second resistance R 102, the 3rd resistance R 103, the first capacitor C 101, the second capacitor C 102, the 3rd capacitor C 103, the 4th capacitor C 104 and the 5th capacitor C 105 form, the positive terminal of rectifier diode T1 is connected with one end of the 3rd capacitor C 103, its public connecting end is connected with the signal output part of filtering input channel module 3, the negative pole end ground connection of rectifier diode T1, the other end of the 3rd capacitor C 103 is connected with the in-phase signal input of the first operational amplifier U101 with one end of the second resistance R 102 respectively, the other end ground connection of the second resistance R 102, the inversion signal input of the first operational amplifier U101 is connected with the signal output part of the first operational amplifier U101, the positive voltage input of the first operational amplifier U101 respectively with one end of the first resistance R 101, one end of the first capacitor C 101 is connected with one end of the second capacitor C 102, other end access+5V the voltage of the first resistance R 101, the equal ground connection of the other end of the other end of the first capacitor C 101 and the second capacitor C 102, the negative voltage input of the first operational amplifier U101 respectively with one end of the 3rd resistance R 103, one end of the 4th capacitor C 104 is connected with one end of the 5th capacitor C 105, other end access-5V the voltage of the 3rd resistance R 103, the equal ground connection of the other end of the other end of the 4th capacitor C 104 and the 5th capacitor C 105.At this, the first operational amplifier U101 is that model is the amplifier chip of OP177.
In this specific embodiment, as shown in Figure 3, signal attenuation module 5 is by the second operational amplifier U102, the 4th resistance R 123, the 5th resistance R 105, the 6th resistance R 106, the 7th resistance R 107, the 8th resistance R 108, the 6th capacitor C 106, the 7th capacitor C 107, the 8th capacitor C 108 and the 9th capacitor C 109 form, one end of the 5th resistance R 105 is connected with the signal output part of voltage follow module 4, the other end of the 5th resistance R 105 is connected with one end of the 7th resistance R 107 with the inversion signal input of the second operational amplifier U102 respectively, the other end of the 7th resistance R 107 is connected with the signal output part of the second operational amplifier U102, the in-phase signal input of the second operational amplifier U102 is connected with one end of the 4th resistance R 123, the other end ground connection of the 4th resistance R 123, the positive voltage input of the second operational amplifier U102 respectively with one end of the 6th resistance R 106, one end of the 6th capacitor C 106 is connected with one end of the 7th capacitor C 107, other end access+5V the voltage of the 6th resistance R 106, the equal ground connection of the other end of the other end of the 6th capacitor C 106 and the 7th capacitor C 107, the negative voltage input of the second operational amplifier U102 respectively with one end of the 8th resistance R 108, one end of the 8th capacitor C 108 is connected with one end of the 9th capacitor C 109, other end access-5V the voltage of the 8th resistance R 108, the equal ground connection of the other end of the other end of the 8th capacitor C 108 and the 9th capacitor C 109.At this, the second operational amplifier is that model is the amplifier chip of OP177.
In this specific embodiment, as shown in Figure 4, level adjusting module 6 is by the adjustable operational amplifier U503 of high-gain, the 9th resistance R 510, the tenth resistance R 511, the 11 resistance R 512, the 12 resistance R 513, the 13 resistance R 514, the tenth capacitor C 510, the 11 capacitor C 511, the 12 capacitor C 512, the 13 capacitor C 513 and the 14 capacitor C 514 form, the signal input part of high-gain is adjustable operational amplifier U503 is connected with the signal output part of signal attenuation module 5, the ground end ground connection of high-gain is adjustable operational amplifier U503, a gain control end of high-gain is adjustable operational amplifier U503 respectively with one end of the tenth capacitor C 510, one end of the 9th resistance R 510 is connected with one end of the tenth resistance R 511, the equal ground connection of the other end of the other end of the tenth capacitor C 510 and the 9th resistance R 510, the positive voltage input of high-gain is adjustable operational amplifier U503 respectively with the other end of the tenth resistance R 511, one end of the 11 resistance R 512, one end of the 11 capacitor C 511 is connected with one end of the 12 capacitor C 512, other end access+5V the voltage of the 11 resistance R 512, the equal ground connection of the other end of the other end of the 11 capacitor C 511 and the 12 capacitor C 512, the negative voltage input of high-gain is adjustable operational amplifier U503 respectively with one end of the 13 resistance R 514, one end of the 13 capacitor C 513 is connected with one end of the 14 capacitor C 514, other end access-5V the voltage of the 13 resistance R 514, the equal ground connection of the other end of the other end of the 13 capacitor C 513 and the 14 capacitor C 514, the feedback end of high-gain is adjustable operational amplifier U503 is connected with the signal output part of the adjustable operational amplifier U503 of high-gain by the 12 resistance R 513.At this, high-gain is adjustable, and operational amplifier U503 is that model is the program control amplifier chip of AD603.
In this specific embodiment, as shown in Figure 5, signal amplification module 7 is by the 3rd operational amplifier U104, the 14 resistance R 116, the 15 resistance R 117, the 16 resistance R 118, the 17 resistance R 119, the 18 resistance R 120, the 15 capacitor C 115, the 16 capacitor C 116, the 17 capacitor C 117, the 18 capacitor C 118 and the 19 capacitor C 119 form, one end of the 14 resistance R 116 is connected with the signal output part of level adjusting module 6, the other end of the 14 resistance R 116 respectively with one end of the 15 capacitor C 115, the inversion signal input of the 3rd operational amplifier U104 is connected with one end of the 17 resistance R 119, the other end ground connection of the 15 capacitor C 115, the other end of the 17 resistance R 119 is connected with the signal output part of the 3rd operational amplifier U104, the in-phase signal input of the 3rd operational amplifier U104 is connected with one end of the 15 resistance R 117, the other end ground connection of the 15 resistance R 117, the positive voltage input of the 3rd operational amplifier U104 respectively with one end of the 16 resistance R 118, one end of the 16 capacitor C 116 is connected with one end of the 17 capacitor C 117, other end access+12V the voltage of the 16 resistance R 118, the equal ground connection of the other end of the other end of the 16 capacitor C 116 and the 17 capacitor C 117, the negative voltage input of the 3rd operational amplifier U104 respectively with one end of the 18 resistance R 120, one end of the 18 capacitor C 118 is connected with one end of the 19 capacitor C 119, other end access-12V the voltage of the 18 resistance R 120, the equal ground connection of the other end of the other end of the 18 capacitor C 118 and the 19 capacitor C 119.At this, the 3rd operational amplifier U104 is that model is the amplifier chip of OP177.
In this specific embodiment, as shown in Figure 6, switch-capacitor filtering module 8 is comprised of switch-capacitor filtering chip U105 and peripheral circuit, and wherein, switch-capacitor filtering chip U105 is that model is the integrated chip of LTC1164-5CSW.In Fig. 6, the 2nd pin of switch-capacitor filtering chip U105 is connected with the signal output part of signal amplification module 7, the output signal of access signal amplification module 7 outputs; The 12nd pin of switch-capacitor filtering chip U105 is connected with the signal output part of low-pass filtering control module 2 by a resistance R 122, the PWM wave control signal of access low-pass filtering control module 2 outputs; The 9th pin of switch-capacitor filtering chip U105 is connected with the signal input part of filtering output channel module 9.During work, switch-capacitor filtering chip U105 receives after the low-pass filtering control module 2 PWM wave control signals of transmission and the output signal of signal amplification module 7, switch-capacitor filtering chip U105 mates the output signal by 7 outputs of signal amplification module receiving with the PWM wave control signal of being exported by low-pass filtering control module 2 after, export useful frequency content to filtering output channel module 9, realize low-pass filtering, wherein the angular frequency precision of switch-capacitor filtering chip U105 can reach 0.03%, and temperature is floated coefficient can reach 0.0002dB/ ℃.
In this specific embodiment, power module 1 has been adopted existing power module; Filtering input channel module 3 and filtering output channel module 9 all can be comprised of the binding post of simple 2pin.
Claims (10)
1. a cut-off frequency and the adjustable Multi-channel low pass filter of gain, comprise power module, low-pass filtering control module and at least one road filtration module, it is characterized in that described filtration module is by filtering input channel module, voltage follow module, signal attenuation module, level adjusting module, signal amplification module, switch-capacitor filtering module and filtering output channel module form, described power module respectively with described low-pass filtering control module, described voltage follow module, described signal attenuation module, described level adjusting 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 voltage follow module, the signal output part of described voltage follow module is connected with the signal input part of described signal attenuation module, the signal output part of described signal attenuation module is connected with the signal input part of described level adjusting module, the signal output part of described low-pass filtering control module is connected with the signal controlling end of described level adjusting module, the signal output part of described level adjusting 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 signal controlling end of described switch-capacitor filtering module, the signal output part of described switch-capacitor filtering module is connected with the signal input part of described filtering output channel module.
2. a kind of cut-off frequency according to claim 1 and the adjustable Multi-channel low pass filter of gain, is characterized in that described low-pass filtering control module is mainly comprised of micro-chip processor and peripheral circuit.
3. a kind of cut-off frequency according to claim 2 and the adjustable Multi-channel low pass filter of gain, is characterized in that described micro-chip processor is that model is the integrated chip of ATmega8L-8AC.
4. according to a kind of cut-off frequency described in any one in claims 1 to 3 and the adjustable Multi-channel low pass filter of gain, it is characterized in that described voltage follow module is by rectifier diode, the first operational amplifier, the first resistance, the second resistance, the 3rd resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity and the 5th electric capacity form, the positive terminal of described rectifier diode is connected with one end of described the 3rd electric capacity, its public connecting end is connected with the signal output part of described filtering input channel module, the negative pole end ground connection of described rectifier diode, the other end of the 3rd described electric capacity is connected with the in-phase signal input of one end of described the second resistance and described the first operational amplifier respectively, the other end ground connection of the second described resistance, the inversion signal input of the first described operational amplifier is connected with the signal output part of the first described operational amplifier, the positive voltage input of the first described operational amplifier respectively with one end of described the first resistance, one end of the first described electric capacity is connected with one end of the second described electric capacity, other end access+5V the voltage of the first described resistance, the equal ground connection of the other end of the other end of the first described electric capacity and the second described electric capacity, the negative voltage input of the first described operational amplifier respectively with one end of described the 3rd resistance, one end of the 4th described electric capacity is connected with one end of the 5th described electric capacity, other end access-5V the voltage of the 3rd described resistance, the equal ground connection of the other end of the other end of the 4th described electric capacity and the 5th described electric capacity.
5. a kind of cut-off frequency according to claim 4 and the adjustable Multi-channel low pass filter of gain, it is characterized in that described signal attenuation module is by the second operational amplifier, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity and the 9th electric capacity form, one end of the 5th described resistance is connected with the signal output part of described voltage follow module, the other end of the 5th described resistance is connected with one end of the inversion signal input of described the second operational amplifier and described the 7th resistance respectively, the other end of the 7th described resistance is connected with the signal output part of the second described operational amplifier, the in-phase signal input of the second described operational amplifier is connected with one end of the 4th described resistance, the other end ground connection of the 4th described resistance, the positive voltage input of the second described operational amplifier respectively with one end of described the 6th resistance, one end of the 6th described electric capacity is connected with one end of the 7th described electric capacity, other end access+5V the voltage of the 6th described resistance, the equal ground connection of the other end of the other end of the 6th described electric capacity and the 7th described electric capacity, the negative voltage input of the second described operational amplifier respectively with one end of described the 8th resistance, one end of the 8th described electric capacity is connected with one end of the 9th described electric capacity, other end access-5V the voltage of the 8th described resistance, the equal ground connection of the other end of the other end of the 8th described electric capacity and the 9th described electric capacity.
6. a kind of cut-off frequency according to claim 5 and the adjustable Multi-channel low pass filter of gain, it is characterized in that described level adjusting module is by the adjustable operational amplifier of high-gain, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the tenth electric capacity, the 11 electric capacity, the 12 electric capacity, the 13 electric capacity and the 14 electric capacity form, the signal input part of the described adjustable operational amplifier of high-gain is connected with the signal output part of described signal attenuation module, the ground end ground connection of the described adjustable operational amplifier of high-gain, a gain control end of the described adjustable operational amplifier of high-gain respectively with one end of described the tenth electric capacity, one end of the 9th described resistance is connected with one end of the tenth described resistance, the equal ground connection of the other end of the other end of the tenth described electric capacity and the 9th described resistance, the positive voltage input of the described adjustable operational amplifier of high-gain respectively with the other end of described the tenth resistance, one end of the 11 described resistance, one end of the 11 described electric capacity is connected with one end of the 12 described electric capacity, other end access+5V the voltage of the 11 described resistance, the equal ground connection of the other end of the other end of the 11 described electric capacity and the 12 described electric capacity, the negative voltage input of the described adjustable operational amplifier of high-gain respectively with one end of described the 13 resistance, one end of the 13 described electric capacity is connected with one end of the 14 described electric capacity, other end access-5V the voltage of the 13 described resistance, the equal ground connection of the other end of the other end of the 13 described electric capacity and the 14 described electric capacity, the feedback end of the described adjustable operational amplifier of high-gain is connected with the signal output part of the described adjustable operational amplifier of high-gain by the 12 described resistance.
7. a kind of cut-off frequency according to claim 6 and the adjustable Multi-channel low pass filter of gain, is characterized in that the described adjustable operational amplifier of high-gain is that model is the amplifier chip of AD603.
8. a kind of cut-off frequency according to claim 6 and the adjustable Multi-channel low pass filter of gain, it is characterized in that described signal amplification module is by the 3rd operational amplifier, the 14 resistance, the 15 resistance, the 16 resistance, the 17 resistance, the 18 resistance, the 15 electric capacity, the 16 electric capacity, the 17 electric capacity, the 18 electric capacity and the 19 electric capacity form, one end of the 14 described resistance is connected with the signal output part of described level adjusting module, the other end of the 14 described resistance respectively with one end of described the 15 electric capacity, the inversion signal input of the 3rd described operational amplifier is connected with one end of the 17 described resistance, the other end ground connection of the 15 described electric capacity, the other end of the 17 described resistance is connected with the signal output part of the 3rd described operational amplifier, the in-phase signal input of the 3rd described operational amplifier is connected with one end of the 15 described resistance, the other end ground connection of the 15 described resistance, the positive voltage input of the 3rd described operational amplifier respectively with one end of described the 16 resistance, one end of the 16 described electric capacity is connected with one end of the 17 described electric capacity, other end access+12V the voltage of the 16 described resistance, the equal ground connection of the other end of the other end of the 16 described electric capacity and the 17 described electric capacity, the negative voltage input of the 3rd described operational amplifier respectively with one end of described the 18 resistance, one end of the 18 described electric capacity is connected with one end of the 19 described electric capacity, other end access-12V the voltage of the 18 described resistance, the equal ground connection of the other end of the other end of the 18 described electric capacity and the 19 described electric capacity.
9. a kind of cut-off frequency according to claim 8 and the adjustable Multi-channel low pass filter of gain, is characterized in that described switch-capacitor filtering module is comprised of switch-capacitor filtering chip and peripheral circuit.
10. a kind of cut-off frequency according to claim 9 and the adjustable Multi-channel low pass filter of gain, is characterized in that described switch-capacitor filtering chip is that model is the integrated chip of LTC1164-5CSW.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320747530.3U CN203574616U (en) | 2013-11-22 | 2013-11-22 | Multichannel low-pass filter with adjustable cut-off frequency and gain |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320747530.3U CN203574616U (en) | 2013-11-22 | 2013-11-22 | Multichannel low-pass filter with adjustable cut-off frequency and gain |
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| CN203574616U true CN203574616U (en) | 2014-04-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108075795A (en) * | 2017-12-26 | 2018-05-25 | 深圳市强军科技有限公司 | Multifrequency receiver radio frequency front-end device |
| CN109314505A (en) * | 2015-11-23 | 2019-02-05 | 安乐泰克有限公司 | Variable filter |
-
2013
- 2013-11-22 CN CN201320747530.3U patent/CN203574616U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109314505A (en) * | 2015-11-23 | 2019-02-05 | 安乐泰克有限公司 | Variable filter |
| CN109314505B (en) * | 2015-11-23 | 2022-08-05 | 安乐泰克有限公司 | Variable filter |
| CN108075795A (en) * | 2017-12-26 | 2018-05-25 | 深圳市强军科技有限公司 | Multifrequency receiver radio frequency front-end device |
| CN108075795B (en) * | 2017-12-26 | 2023-11-28 | 深圳市强军科技有限公司 | Radio frequency front-end device of multi-frequency receiver |
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