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GATE 2022 PH – Question 11

Electronics · negative and positive feedback circuits · 1 mark · Multiple choice

For the shown op-amp circuit, choose the output for $V_{in}=1.5\sin(20\pi t)$ V and saturation voltages $\pm10$ V.

Positive-feedback op-amp and four candidate output waveforms, continued on the next page.
  1. Option A in the figure
  2. Option B in the figure
  3. Option C in the figure
  4. Option D in the figure

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Show answer and explanation

Correct answer: (A) Option A in the figure

Explanation

The noninverting input receives positive feedback with threshold magnitude 10(2.2/22.2)=0.991 V. The 1.5 V input crosses both thresholds and produces a saturated square wave.