Rp -OVOUT VIN O Rs Vss = -VDD а. Draw the small-signal model. b. Determine the small-signal gain vou/Vin- c. Explain how Rs affects the small-signal gain. What happens if Rs = 0N?

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NFET Common Source Amplifier with Source Degeneration: For the circuit below, assume the MOSFET operates in saturation and is characterized by parameters VTN and KN.

+V
DD
Rp
OVOUT
VIN O
Rs
Vss = -VDD
а.
Draw the small-signal model.
b. Determine the small-signal gain voul Vin-
c. Explain how Rs affects the small-signal gain. What happens if Rs
= 02?
d. Simplify the gain expression assuming that gR_is much greater than 1. What happens to the
g,
т s
m
in the expression?
What might be the benefit of having a gain that is (nearly) independent of g ?
е.
т
f. Determine the small-signal output resistance.
g. Determine the small-signal input resistance.
Transcribed Image Text:+V DD Rp OVOUT VIN O Rs Vss = -VDD а. Draw the small-signal model. b. Determine the small-signal gain voul Vin- c. Explain how Rs affects the small-signal gain. What happens if Rs = 02? d. Simplify the gain expression assuming that gR_is much greater than 1. What happens to the g, т s m in the expression? What might be the benefit of having a gain that is (nearly) independent of g ? е. т f. Determine the small-signal output resistance. g. Determine the small-signal input resistance.
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