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10.27 A common-emitter amplifier is measured at midband and found to have a gain of -50 V/V between base and collector. If C₂ = 10 pF, C₁ = 1 pF, and the effective source resistance Rig = 5 kn [refer to Fig. 10.13(c)], find Cin and the 3-dB frequency fu
Ras Vsig = Vsis Fm Ris Roig // m Va I'# + Rig B Ca (b) X' Cμ (c) || 8mVr SmVw R₁L www Vo R₁ = R₁//ro V₁ = -8mR₁,VT (d) equivalent circuit with C, replaced at the input side with the equivalent capacitance C; (e) sketch of (b) equivalent circuit; (c) the circuit of (b) simplified at both the input side and the output side, Figure 10.13 Determining the high-frequency response of the CE amplifier: (a) amplifier circuit, "eq³ the frequency-response Bode plot, which is that of a low-pass STC circuit.
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