Hardware interview practice
Calculate Schmitt-Trigger Hysteresis
A noninverting Schmitt input switches its output high when a rising input crosses 0.70 V and switches low when a falling input crosses 0.30 V. Which statement is correct?
Choose one
Answer choices
- A. Both transitions occur at 0.50 V, so hysteresis width is zero and history never matters.
- B. The upper threshold is 0.70 V, the lower threshold is 0.30 V, and hysteresis width is 0.40 V; an input between the thresholds retains the output state set by its prior history.
- C. The upper threshold applies only to falling inputs and the lower threshold only to rising inputs.
- D. Hysteresis width is 1.00 V because the two thresholds must be added.