Chapter 8, Problem 8.33P

Consider the transformer−coupled common−emitter circuit shown in Figure P8.33 with parameters $V_{CC}=12\text{V}$ , $R_E=20\Omega$ , $R_L=8\Omega$ , $R_1=2.3\text{k}\Omega$ , and $R_2=1.75\text{k}\Omega$ . The transistor parameters are $\beta =40$ and $V_{BE}(on)=0.7\text{V}$ . (a) Determine the quiescent value $I_{CQ}$ . (b) Determine the turns ratio a such that the maximum power is delivered to the load. (c) Determine the maximum power that can be delivered to the load if the voltage ${\upsilon }_1$ is to remain in the range $2\le {\upsilon }_1\le 20\text{V}$ . (d) Using the results of part (c) and neglecting currents in the bias resistors, find the conversion efficiency.