Basic Op-Amp Circuits - Technical MCQs

Q1:

The critical frequency for the active filter in the given circuit is approximately _______.

A 20.1 kHz

B 89.3 kHz

C 14.2 kHz

D 179 kHz

ANS:A - 20.1 kHz

Use formula for second order low pass filter :

f= 1/sqrt(r1*r2*c1*c2)