Multi-channel lowpass filter

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 [0001] The invention relates to a low-pass filter, in particular to a multi-channel low-pass filter. Background technique [0002] Multi-channel low-pass filters can transmit useful frequency components in the input signal, attenuate or suppress useless frequency components; traditional multi-channel low-pass filters mainly include Butterworth filters, Chebyshev filters and elliptic filters , the three have different passband and transition band characteristics; the elliptic filter has a steeper transition band and poorer phase-frequency characteristics than the Butterworth filter; the Chebyshev filter has a The transition band is narrow, and the phase-frequency characteristics are also poor; with the improvement of signal filtering requirements in the fields of safety production and monitoring and detection, the cut-off frequency of traditional multi-channel low-pass filters is relatively high, and its filtering accuracy and stability have been improved. It...

AI Technical Summary

Problems solved by technology

[0002] Multi-channel low-pass filters can transmit useful frequency components in the input signal, attenuate or suppress useless frequency components; traditional multi-channel low-pass filters mainly include Butterworth filters, Chebyshev filters and elliptic filters , the three have different passband and transition band characteristics; the elliptic filter has a steeper transition band and poorer phase-frequency characteristics than the Butterworth filter; the Chebyshev filter has a The transition band is narrow, and the phase-frequency characteristics are also poor; with the improvement of signal filtering requirements in the fields of safety production and monitoring and detection, the cut-off frequency of traditional multi-channel low-pass filters is relatively high, and its filtering accuracy and stability have been improved. It is increasingly unable to meet the requirements; while the Butterworth low-pass filter has good frequency response characteristics in the passband, and is used in bridges, dams, high-rise buildings, tunnels, highways, electric power, petrochemical, fire protection and HVAC, etc. The field of safety production and monitoring and testing has been rapidly developed and widely used

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