Chapter 11, Problem 11.12P

The circuit and transistor parameters for the circuit shown in Figure P 11.11 are $V^{+}=5\text{V},V^{-}=-5\text{V},I_Q=0.2\text{mA},\beta =80,V_{EB}(\text{on})=0.6\text{V},$ and $V_A=\infty .$ (a) Design the circuit such that the minimum common-mode voltage is $v_{cm}=-2.5\text{V}.$ (b) Using the results of part (a), what is the magnitude of the differential-mode gain, $A_d=\left|\left(v_{C1}-v_{C2}\right)/\left(v_1-v_2\right)\right|?$ (c) Determine $v_{C1}$ and $v_{C2}$ for $v_1=0.507\text{V}$ and $v_2=0.493\text{V}.$ (d) What is the minimum output resistance of the current source such that ${\text{CMRR}}_{\text{dB}}=60\text{dB}$ for a one-sided output.