Fourth-order low-pass filter circuit

Published:2011/6/15 10:24:00 Author:John | Keyword: Fourth-order low-pass filter | From:SeekIC

The figure shows a circuit which uses a high-level low-pass filter composed of a piece of LM348 four-operational amplifier. For example, if fc = 20kHz, filter transferring coefficient is counted as H0 = 1, Q01 = 0.541, Q02 = 1.306. Only one current source (LM334Z) is needed to be equipped with the filter because this filter can lead to the same product calculation for four amplifiers within band-pass amplification factor. Potentiometers RP can be used for precision adjustment.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/555_Circuit/Fourth_order_low_pass_filter_circuit.html

Print this Page | Comments | Reading(3)