Problem 2. For the circuit of Figure P-2, it is given that $V_{CC} = +10V$ and $V_{EE} = -10V$. Assume that all transistors are matched and have $\beta = \infty$ and $V_A = 75V$.
a) For $V_s = 0V$, calculate $I_{C2}$ with enough precision to show the effect of a finite $V_A$.
b) Over what range of $V_s$ voltages will all transistors be in their forward active regions?
c) What is the small-signal voltage gain $\frac{V_{out}}{V_s}$?