Question: What is the function of a Schmitt trigger in op-amp circuits?

Options:

1. To amplify weak signals
2. To provide hysteresis in signal switching
3. To filter out high-frequency noise
4. To integrate input signals

Correct Answer: To provide hysteresis in signal switching

Solution:

A Schmitt trigger provides hysteresis in signal switching, which helps to eliminate noise and provide clean transitions between high and low states.