GATE 2016 EE (EE2) – Question 12

Analog and Digital Electronics · Active filters: single stage, Sallen Key, Butterworth · 1 mark · Multiple choice

The op-amp circuit shown is an example of a

Diagram for GATE 2016 EE (EE2) question 12

low-pass filter
band-pass filter
high-pass filter
notch filter

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Correct answer: (A) low-pass filter

Explanation

The inverting amplifier has feedback impedance $Z_f=R_2\parallel1/(sC)=R_2/(1+sR_2C)$. Its gain is $-Z_f/R_1$.

At low frequency its magnitude approaches R2/R1. At high frequency the capacitor shorts the feedback impedance and the gain tends to zero. Thus it passes low frequencies and attenuates high ones: **low-pass, A**.

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