Capacitive commutating filter

Details Capacitive commutating filter Capacitive commutating filter

H - Electricity

03

H

333/50

H03H 17/02 (2006.01) H03H 9/46 (2006.01)

Patent

CA 1183913

CAPACITIVE COMMUTATING FILTER ABSTRACT OF THE DISCLOSURE A capacitive commutating filter provides a D. C. output voltage of amplitude responsive to the amplitude of an input waveform having a frequency substantially equal to the operating frequency of the filter. The filter operating frequency is established by a digital signal. The filter input is selectively and cyclically connected through N input resistances, wherein N is an integer greater than zero, to adjacently progressive N ones of (2N+1) nodes, each having one of (2N+1) capacitive filter elements connected to ground potential. The equilibrium voltages across the capacitive filter elements, established during the N/(2N+1) segments of the input waveform during which each capacitor is connected to the input, are coupled to one set each of maximum-positive- polarity and maximum-negative-polarity diodes, for placing the maximum and minimum filter capacitive element voltages at respective ones of the inverting and non- inverting inputs of a differential amplifier, having the output thereof forming the filter output.

411183

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