A CS amplifier that can be represented by the equivalent circuit of Fig. 10.16 has C_gs=2 pF, C_gd = 0.1 pF, C_L = 2 pF, g_m = 4 mA/V, and R_sig = R'_L = 20 k $\Omega$ . Find the midband gain A_M, the input capacitance C_in using the Miller Effect, and hence an estimate of the 3-dB frequency f_H. Also, obtain another estimate of f_H using open-circuit time constants. Which of the two estimates is more appropriate and why?

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Figure 10.16

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