Chapter 8, Problem 8.42P

The transistors in the output stage in Figure 8.34 are all matched. Their parameters are $\beta =60$ and $I_S=5\times {10}^{-13}\text{A}$ . Resistors $R_1$ and $R_2$ are replaced by 3mA ideal current sources, and $R_3=R_4=0$ . Let $V^{+}=10\text{V}$ and $V^{-}=-10\text{V}$ . (a) Determine the quiescent collector currents in the four transistors for ${\upsilon }_I={\upsilon }_O=0$ .(b) For a load resistance of $R_L=200\text{k}\Omega$ and a peak output voltage of 6V, determine the current gain and voltage gain of the circuit.