Question

A particular op amp using ±15-V supplies operates linearly for outputs in the range −12 V to +12 V. If used in an inverting amplifier configuration of gain –100, what is the rms value of the largest possible sine wave that can be applied at the input without output clipping?

(a) 120 mV

(b) 60 mV

(c) 84.85 mV

(d) 42.42 mV

I had been asked this question in class test.

This interesting question is from Large Signal Operations on operational Amplifiers in chapter Operational Amplifiers of Electronic Devices & Circuits

Answer 1

The correct answer is (c) 84.85 mV

The best I can explain: Peak value of input wave = 12/100 or 120 mV. Hence the rms value is 120/√2 or 84.85 mV.