GATE EC 2015 Set 3 — Question 22
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Analog Circuits → Op-Amp Circuits → Active Filters (Sallen-Key)
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Question
In the circuit shown using an ideal opamp, the 3-dB cut-off frequency (in Hz) is _______.
Correct answer
159 to 160
Solution
The circuit consists of a first-order low-pass filter at the non-inverting input of an opamp configured as a non-inverting amplifier. The cut-off frequency is determined by the network:Given and :The 3-dB cut-off frequency is approximately .
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