A common-emitter amplifier that can be represented by the equivalent circuit of

Question

A common-emitter amplifier that can be represented by the equivalent circuit of Fig. 9.24(a) has C pi = 10 pF. C mu = 0.3 pF. CL = 3 pF. gm= 40 mA/V. beta = 100, rx = 100 Ohm. R'L = 5 k Ohm. and R sig = 1 k Ohm. Fmd the midband gain A M, and an estimate of the 3-dB frequency fH using the Miller approximation. Also, obtain a better estimate of fH using Miller s theorem. Figure 9.24 (a) High-frequency equivalent circuit of the common-emitter amplifier, (b) Equivalent circuit obtained after Thevemn theorem has been employed to simplify the resistive circuit at the input.

Explanation / Answer

Choose C = C1 = C2. then calculate k = 2 p fo C and

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