Simple_low_pass_filter

Published:2009/7/24 13:49:00 Author:Jessie | From:SeekIC

This circuit has a 6-dB per octave rolloff, after a closed-loop 3-dB point that is defined by fc(Fig. 7-41B). Gain below the fc corner frequency is defined by the ratio of R3 to R1. The circuit can be considered as an integrator at frequencies well above fc. However, the time-domain response is that of a single RC, rather than an integral. R2 should be chosen equal to the parallel combination of R1 and R3 to minimize bias-current errors. The op amp should be compensated for unity-gain, or an internally compensated op amp should be used. National Semiconductor, Linear Applications Handbook, 1991, p. 23, 24.



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