Question

The open loop voltage gain of an amplifier is 60 dB. A negative feedback factor 0.03 is applied to it. If the open loop gain change is 10%, find
(a) closed loop gain in decibels
(b) the % change in the over all gain.

Answer 1

G  = 60 dB = 20 log A

20 log₁₀ A = 60

log₁₀ A = 3

A = 10³ = 1000 {log_a N = x = a^x = N}

β = 0.03