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 $v_{o}$ ?

Question

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 $v_{o}$ ?

Quizplus · Accepted Answer

The Answer of 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 $v_{o}$ ?

Figure 751 (Refer to Figure Below) Shows

Figure 751 (Refer to Figure Below)

Shows