Topic: Digital Circuits / Analog Circuits
The output of a Schmitt trigger depends on:
- A. Only input value
- B. Clock transitions
- C. Hysteresis in threshold voltages
- D. Fan-in of the gate
Answer: C. Hysteresis in threshold voltages
Explanation: A Schmitt trigger is a comparator circuit with positive feedback that introduces two different threshold voltage levels (an upper trigger point and a lower trigger point). This difference is called hysteresis. Because of this hysteresis, the output state does not just depend on the instantaneous input value, but also on the previous state of the output, making it highly immune to noise.