A small signal equivalent circuit of single common-emitter amplifier is shown in Figure Q1.b with quiescent collector current of 5 mA and a total of 1 k. The transistor parameters are ß = 100, r = 200, Rs = 286, C₁ = 2 pF, fr = 200 MHz. 1) Deduce the values of 9m, Cfß. 2) Calculate the low-frequency voltage gain Vo/Vs. 1 [Hint: fr = Bfpi f = 2 (G+Cu) fß: Vs Rs b V be Ib b' ₁₂C₁=C₁= IT Figure Q1.b gmV 2 ro C₂ Cs Rc RL

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A small signal equivalent circuit of single common-emitter amplifier is
shown in Figure Q1.b with quiescent collector current of 5 mA and a total
of 1 k. The transistor parameters are ß = 100, r = 200, Rs =
286, C₁ = 2 pF, fr = 200 MHz.
1) Deduce the values of 9m,
Cfß.
2) Calculate the low-frequency voltage gain Vo/Vs.
1
[Hint: fr = Bfpi f = 2 (G+Cu)
fß:
Vs
Rs
b
V be
Ib
b'
₁₂C₁=C₁=
IT
Figure Q1.b
gmV 2
ro
C₂
Cs Rc RL
Transcribed Image Text:A small signal equivalent circuit of single common-emitter amplifier is shown in Figure Q1.b with quiescent collector current of 5 mA and a total of 1 k. The transistor parameters are ß = 100, r = 200, Rs = 286, C₁ = 2 pF, fr = 200 MHz. 1) Deduce the values of 9m, Cfß. 2) Calculate the low-frequency voltage gain Vo/Vs. 1 [Hint: fr = Bfpi f = 2 (G+Cu) fß: Vs Rs b V be Ib b' ₁₂C₁=C₁= IT Figure Q1.b gmV 2 ro C₂ Cs Rc RL
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