Analog and electronic circuits
Which circuit has different thresholds for rising and falling inputs and prevents the output from chattering due to noise?
- APLL
- BSample-and-hold circuit
- CSchmitt trigger
Show answer and explanation
Answer: C. Schmitt trigger
A Schmitt trigger has hysteresis (a difference between rising and falling thresholds) in the input level at which its output switches. Even with slowly changing or noisy input signals, it prevents the output from switching repeatedly near the threshold.