Extra exam question E6C01
Subelement E6, CIRCUIT COMPONENTS· Group E6C
What is the function of hysteresis in a comparator?
- A.To prevent input noise from causing unstable output signals (correct answer)
- B.To allow the comparator to be used with AC input signals
- C.To cause the output to continually change states
- D.To increase the sensitivity
WhyHysteresis in a comparator prevents input noise from causing unstable output signals. Hysteresis in a comparator adds a small gap between the switching thresholds for a rising versus a falling input, which prevents noise riding on a slowly changing input signal from causing the output to chatter rapidly back and forth near the threshold, answer A. It isn't there to allow AC input signals, doesn't cause continual output state changes (that's the problem it prevents), and doesn't increase sensitivity, if anything it slightly reduces sensitivity right around the threshold in exchange for stability.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
Related questions
- E6C02What happens when the level of a comparator’s input signal crosses the threshold voltage?
- E6C03What is tri-state logic?
- E6C04Which of the following is an advantage of BiCMOS logic?
- E6C05Which of the following digital logic families has the lowest power consumption?
- E6C06Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply?