Published:2009/7/2 4:14:00 Author:May | From:SeekIC
Improvements in commutating RC network filter extend dynamic range without sacrificing signal bandwidth, for reducing interference at fundamental of power-line frequency and harmonics up to fifth. Although values in circuit are for British 50-Hz mains frequency, circuit can readily be adapteU for 60-Hz rejection. Operation involves commutating 16 capacitors electroni.cally at 16 times line frequency, Article gives one method of doing this, by driving two 8-way multiplexors alternately. Each multiplexec has eight MOSFETg, each switched on in turn by consecutive input clock pulses. Circuit details, design equations, and performance graphs are given Three-position swith gives choice of filer characteristics.-K. F. Knott and L. Unsworth, Mains Rejection Tracking Filter, Wireless World,Oct.1974, p 375-379.
Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/Filter_Circuit/TRACKING_LINE_FREQUENCY_FILTER.html
Print this Page | Comments | Reading(3)
Code: