Chapter 11, Problem 11.22P

The circuit parameters of the diff-amp shown in Figure 11.2 are $V^{+}=3\text{V},V^{-}=-3\text{V},$ and $I_Q=0.25\text{mA}.$ Base currents are negligible and $V_A=\infty$ for each transistor. (a) Design the circuit such that a differential-mode output voltage of $v_o=v_{C1}-v_{C2}=1.2\text{V}$ is produced when a differential-mode input voltage of $v_d=v_1-v_2=16\text{mV}$ is applied. (b) What is the maximum possible common-mode input voltage that can be applied such that the input transistors remain biased in the forward-active mode? (c) For a one-sided output, what is the value of ${\text{CMRR}}_{\text{dB}}$ if the output resistance of the current source is $R_o=4\text{M}\Omega ?$