A common-emitter amplifier has C = 10 pF, C = 0.3 pF, CL = 3 pF, gm = 40 mA/V, = 100, rx

Chapter 10, Problem 10.63

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A common-emitter amplifier has \(C_{\pi}=10 \ \mathrm{pF}, C_{\mu}=0.3 \ \mathrm{pF}, C_{L}=3 \ \mathrm{pF}, g_{m}=40 \mathrm{~mA} / \mathrm{V}, \beta=100, r_{x}=100 \ \Omega, R_{L}^{\prime}=5 \ \mathrm{k} \Omega\), and \(R_{\mathrm{sig}}=1 \ \mathrm{k} \Omega\). Find the midband gain \(A_{M}\) and an estimate of the 3-dB frequency \(f_{H}\) using the Miller approximation. Also, obtain another estimate of fH using the method of open-circuit time constants. Which of the two estimates would you consider to be more realistic, and why?

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