GATE EE 2014 Set 1 — Question 61
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Analog & Digital Electronics → Frequency Response & Root Locus → Bode Plots
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Question
In the figure shown, assume the op-amp to be ideal. Which of the alternatives gives the correct Bode plots for the transfer function ?
Correct answer
(A) [figure]
Solution
The circuit is a non-inverting amplifier with a low-pass filter at the input. The voltage at the non-inverting terminal is .
Since the op-amp is ideal and in a buffer configuration (gain = 1), .
The transfer function is .
Given and , .
The corner frequency is .
This is a first-order low-pass filter:
Since the op-amp is ideal and in a buffer configuration (gain = 1), .
The transfer function is .
Given and , .
The corner frequency is .
This is a first-order low-pass filter:
- Magnitude: 0 dB for , then -20 dB/decade.
- Phase: at low frequency, at , and at high frequency.
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