Express closed loop voltage gain (AF) in terms of open loop gain (A) and feedback circuit gain (B)?
(a) AF = A/AB
(b) AF = 1+ (A/AB)
(c) AF = A/(1+AB)
(d) AF = AB/(1+A)
I had been asked this question by my college professor while I was bunking the class.
This intriguing question comes from Voltage Series Feedback Amplifier topic in section Operational Amplifier Characteristics of Linear Integrated Circuits