Topic: Analog Circuits
If the input to the circuit of Figure is a sine wave, then the output will be
- A. Half wave rectified sine wave
- B. A full wave rectified sine wave
- C. A square wave
- D. A triangular wave
Answer: C. A square wave
Explanation: Since, the gain of op-amp is always very high, so $V_{out}=+V_{sat}$ when $V_{non-inverting}>V_{inverting}$ and $V_{out}=-V_{sat}$ when $V_{inverting}>V_{non-inverting}$. So, for positive half cycle, $V_{inverting}>V_{non-inverting} \Rightarrow V_{out}=-V_{sat}$. For negative half cycle, $V_{inverting}<V_{non-inverting} \Rightarrow V_{out}=+V_{sat}$. The output wave is a square wave.