Figure 751 (Refer to Figure Below)


Shows

Figure 7.5.1 (refer to Figure below)


shows a capacitively coupled amplifier. In the following, assume operation at midband frequencies where the coupling and bypass capacitors behave as short circuits. The BJT has $\beta=99$ and the Early effect can be neglected.
(a) If the de voltage at the base is to be $5 \mathrm{~V}$ and the emitter current $1 \mathrm{~mA}$ , find the required value of $\left(R_{E 1}+R_{E 2}\right)$ . Assume $V_{B E}=0.7 \mathrm{~V}$ .
(b) If the input resistance at the base, $R_{i b}$ , is to be $10 \mathrm{k} \Omega$ , find the required value of $R_{E 1}$ and hence the value of $R_{E 2}$ .
(c) If the dc current in $R_{B 2}$ is to be $0.1 \mathrm{~mA}$ , find the values of $R_{B 1}$ and $R_{B 2}$ .
(d) Find the value of $R_{C}$ that results in a de voltage of $+6 \mathrm{~V}$ at the collector.
(e) Find the input resistance $R_{\text {in }}$ and the value of $v_{b} / v_{\text {sig. }}$ .
(f) Find the value of $v_{o} / v_{b}$ .
(g) Find the value of the overall voltage gain $v_{o} / v_{\text {sig }}$ .
(h) If the peak amplitude of the signal between base and emitter $\left(v_{\pi}\right)$ is to be limited to $5 \mathrm{mV}$ , what are the corresponding amplitudes of $v_{b}, v_{\mathrm{sig}}$ , and $v_{o}$ ?

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Refer to Figure 7.5.1



Figure 7.5...

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