Consider the op-amp circuit in Figure. The op-amp has a finite gain, so that io = Aiε, and a zero output impedance.
(a) Write the closed-loop transfer function in the form
(b) What is the expression for β?
(c) If Ai = 105 and Ai f = 25, what is the required βi and RF /R3?
(d) If Ai decreases by 15 percent, what is the percent change in Ai f?