Find net voltage gain, given hfe = 50 and hie = 1kΩ.

Find net voltage gain, given hfe = 50 and hie = 1kΩ. Correct Answer -27.68

Apply millers theorem to resistance between input and output. At input, RM=100k/1-K = RI Output, RN=100k/1-K-1 ≈ 100k Internal voltage gain , K = -hfeRL’/hie K = – 50xRc||100k/1k = – 50x4x100/104 = – 192 RI = 100k/1+192 = 0.51kΩ RI’ = RI||hie = 0.51k||1k = 0.51×1/1.51 = 0.337kΩ Net voltage gain = K.RI’/RS+RI’ = – 192 x 0.337/2k + 0.337k = -27.68.
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