Chapter 11, Problem 11.81P

Consider the BiCMOS diff-amp in Figure 11.44 , biased at $I_Q=0.4\text{mA}$ . The transistor parameters for $M_1$ and $M_2$ are: $K_n=0.2\text{mA}/{\text{V}}^2,V_{TN}=1$ V, and $\lambda =0.01{\text{V}}^{-1}.$ The parameters for $Q_1$ and $Q_2$ are: $\beta =120$ $V_{EB}(\text{on})=0.7\text{V},$ and $V_A=80\text{V}.$ (a) Determine the differential-mode voltage gain. (b) If the output resistance of the current source is $R_o=500\text{k}\Omega ,$ determine the common-mode voltage gain using a computer simulation analysis.