Find the small signal gain_ Non conventional Circuit Analysis

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not 3 port ,it is 3 node/terminal element if we neglect body terminal.You know.

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Thank you Sir 👍
Very helpful and very Simple conpect!
Case 1: CLM=0
gmvgs=vo/Rs, -gmvo=vo/Rs,vo(1/Rs+gm)=0..Answer

Case 2: CLM is not equal to 0
(vin-vo/ro)=(vo/Rs)+gmvo,
vin/ro=vo(1/ro+1/rs+gm), vo/vi=

SAhellenLily
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The Significance of this circuit can be understood to analyze power supply rejection of a source follower circuit or to analyze a power supply rejection of an LDO (assuming we have an Opamp in feedback)

bhavikparekh