Question

How do we calculate the output voltage of a high frequency response of differential amplifier?

(a) VO = -Ad × Vd + AC × VC

(b) VO = -Ad × Vd – AC × VC

(c) VO = Ad × Vd + AC × VC

(d) VO = Ad × Vd – AC × VC

This question was posed to me by my college director while I was bunking the class.

My question comes from High Frequency Response of the Differential Amplifiers topic in division Frequency Response of Electronic Devices & Circuits

Answer 1

The correct option is (c) VO = Ad × Vd + AC × VC

Easiest explanation: The differential gain of a high frequency response of differential amplifier is defined as the gain obtained at the output signal with respect to the difference in the input signals applied. To calculate the output voltage of a high frequency response of differential amplifier we use Ad × Vd + AC × VC. Where, Ad is the differential gain and AC and VC represent the common mode gain.