Chapter 11, Problem 11.1P

(a) A differential-amplifier has a differential-mode gain of $A_d=250$ and a common-mode rejection ratio of CMRR ${}_{\text{dB}}=\infty .$ A differential-mode input signal of $v_d=1.5\sin \omega t\text{mV}$ is applied along with a common-mode input signal of $v_{cm}=3\sin \omega t$ V. Assuming the common-mode gain is positive, determine the output voltage. (b) Repeat part (a) if the common-mode Rejection ratio is CMRR ${}_{\text{dB}}=80\text{dB}$ . (c) Repeat part (a) if the common mode rejection ratio is ${\text{CMRR}}_{\text{dB}}=50\text{dB}$ .