The Feedback Voltage Amplifier in Fig $R_{1}$ And $R_{2}$ the Following Component Values Are Given

Essay

The feedback voltage amplifier in Fig. 11.5.1

Figure 11.5.1
utilizes the series-shunt feedback topology with the feedback network composed of $R_{1}$ and $R_{2}$ . The following component values are given: $R_{S}=5 \mathrm{k} \Omega, R_{1}=1 \mathrm{k} \Omega, R_{2}=$ $11 \mathrm{k} \Omega$ , and $R_{5}=300 \Omega$ . The BJTs have $\beta=100$ , $\left|V_{B E}\right|=0.7 \mathrm{~V}$ , and $r_{o}=\infty$ . The capacitors $C_{1}, C_{2}$ , $C_{3}$ , and $C_{4}$ are very large.
(a) Find values for $R_{B 1}, R_{B 2}, R_{3}, R_{C 1}, R_{4}$ , and $R_{C 2}$ so as to establish the following de conditions: $V_{B 1}=+4 \mathrm{~V}, V_{C 1}=+6 \mathrm{~V}, V_{C 2}=+4 \mathrm{~V}, I_{E 1}=$ $I_{E 2}=1 \mathrm{~mA}$ , and $I=0.1 \mathrm{~mA}$ . Hint: Do as many of your calculations as possible on Fig. 11.5.1 on the exam paper.
(b) Supply the $A$ circuit and find the values of $A$ , $R_{i}$ , and $R_{O}$ .
(c) Supply the $\beta$ circuit and find the value of $\beta$ .
(d) Find the closed-loop gain $A_{f} \equiv V_{o} / V_{s}$ , the input resistance $R_{\mathrm{in}}$ , and the output resistance $R_{\text {out. }}$