Direction: Consider the common source amplifier shown below. The transistor parameter are VTN = 1.5 V, Kn = 0.5 mA/ V2, and λ = 0.01 V– 1. The resistance of source is RS = 4 kΩ.
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The amplifier output resistance is:
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- 4.76 kΩ
- 100 kΩ
- 5 kΩ
- 0
Correct Option: A
From small-signal equivalent circuit shown in fig.
R0 = r0 || RD = 100 || 5
| = | = | = 4.76 kΩ | ||
| 100 + 5 | 105 |
