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# (Solved): Unless otherwise specified, use $$\beta_{F}=100, V_{A}=70 \mathrm{~V}, K_{p}=K_{n}=1 \mathrm{~mA} ... Unless otherwise specified, use \( \beta_{F}=100, V_{A}=70 \mathrm{~V}, K_{p}=K_{n}=1 \mathrm{~mA} / \mathrm{V}^{2}, V_{T N}=-V_{T P}=1 \mathrm{~V}$$, and $$\lambda=0.02 \mathrm{~V}^{-1}$$ 18. (a) Draw the low-frequency and midband equivalent circuits for the common-emitter amplifier in ? Fig. P9.18 if $$R_{l}=2 \mathrm{k} \Omega$$. $$R_{1}=110 \mathrm{k} \Omega, R_{2}=330 \mathrm{k} \Omega, R_{E}=13 \mathrm{k} \Omega, R_{C}=43 \mathrm{k} \Omega$$, and $$R_{3}=43 \mathrm{k} \Omega$$. (b) What are the lower-cutoff frequency and midband gain of the amplifier assuming a Q-point of $$(0.164 \mathrm{~mA}, 2.79 \mathrm{~V})$$ and $$\beta_{o}=100$$ ? (c) What is the value of $$V_{C C}$$ ? Figure P9.18

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