Question

An op amp having a slew rate of 20 V/µs is to be used in the unity-gain follower configuration, with input pulses that rise from 0 to 3 V. What is the shortest pulse that can be used while ensuring full-amplitude output?

(a) 0.10 µs

(b) 0.15 µs

(c) 0.20 µs

(d) 0.30 µs

The question was posed to me at a job interview.

My question is based upon Large Signal Operations on operational Amplifiers topic in section Operational Amplifiers of Electronic Devices & Circuits

Answer 1

The correct option is (b) 0.15 µs

Best explanation: Time taken to reach 3V from 0V with slew rate of 20V/µs is 3/20 µs or 0.15 µs.