Chapter 11, Problem 11.3EP

Consider the diff-amp described in Example 11.3 . Assume the same circuit and transistor parameters except for the current source output resistance $R_o$ . Determine the required value of $R_o$ to produce a CMRR ${}_{\text{dB}}$ of (a) $75\text{dB}$ and (b) $95\text{dB}$ . (Ans. (a) $R_o=362\text{k}\Omega ,$ (b) $R_o=3.62\text{M}\Omega$ ).