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For the circuit shown in the figure the voltage gain is | VO/ VS | = AV Given gm = 1 β = 100, AV is given by— 25 
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- 100
- 800
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80 x 10 11 - 40
Correct Option: D
| Given RC = 2 k, AVS = | | V0 VS, gm = | , β = 100, AV =? | 25 |
we know that
gm r π= β
| rπ = | = | = 2500 | gm | 1/25 |
| Vπ= VS. | (2.5 k + 2.5 k) |
By applying potential divider rule and neglecting 25k being very high.
Now, Vo = gm Vπ. RC
| or Vo = | × VS. |  |  | · 2000 | 25 | 5 |
| or | = | VS | 50 |
| or Ar = | = 40 | VS |
Hence alternative (D) is the correct answer.
