Chapter 11, Problem 11.29P

The transistor parameters for the circuit shown in Figure P 11.29 are $\beta =180,V_{BE}(\text{ on })=0.7\text{V}$ (except for $Q_4$ ), $V_A=\infty$ for $Q_1$ and $Q_2,$ and $V_A=100\text{V}$ for $Q_3$ and $Q_4.$ (a) Determine $R_1$ and $R_2$ such that $I_1=0.5\text{mA}$ and $I_Q=140\mu \text{A}.$ (b) Determine the common-mode input resistance. (c) For $R_C=40\text{k}\Omega ,$ determine the common-mode voltage gain.