Question

For the common-emitter amplifier of Fig. P9.14, neglect $r_{o}$ and assume the current source to be ideal (a) Derive an expression for the midband gain. (b) Derive expressions for the break frequencies caused by $C_{E}$ and $C_{C}$ (c) Give an expression for the amplifier voltage gain $A(s)$ (d) For $R_{\mathrm{sig}}=R_{c}=R_{L}=10 \mathrm{k} \Omega, \beta=100,$ and $I=1 \mathrm{mA},$ find the value of the midband gain. (e) Select values for $C_{E}$ and $C_{C}$ to place the two break frequencies a decade apart and to obtain a lower 3 -dB frequency of $100 \mathrm{Hz}$ while minimizing the total capacitance. (f) Sketch a Bode plot for the gain magnitude, and estimate the frequency at which the gain becomes unity. $(\mathrm{g})$ Find the phase shift at $100 \mathrm{Hz}$

          For the common-emitter amplifier of Fig. P9.14, neglect $r_{o}$ and assume the current source to be ideal
(a) Derive an expression for the midband gain.
(b) Derive expressions for the break frequencies caused by
$C_{E}$ and $C_{C}$
(c) Give an expression for the amplifier voltage gain $A(s)$
(d) For $R_{\mathrm{sig}}=R_{c}=R_{L}=10 \mathrm{k} \Omega, \beta=100,$ and $I=1 \mathrm{mA},$ find
the value of the midband gain.
(e) Select values for $C_{E}$ and $C_{C}$ to place the two break frequencies a decade apart and to obtain a lower 3 -dB frequency of $100 \mathrm{Hz}$ while minimizing the total capacitance.
(f) Sketch a Bode plot for the gain magnitude, and estimate the frequency at which the gain becomes unity.
$(\mathrm{g})$ Find the phase shift at $100 \mathrm{Hz}$

Added by Roberto L.

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