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Calculating output resistance

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Mohammed Abrar

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I tried calculating the output resistance of both the cases but got both of them wrong.

For the left one:

Since it is a common source amplifier:
(1+gm*r0)rs+r0

gm= gm1
r0= (1/Gm3||ro3||ro1)
rs= ro2

Can anyone tell me where exactly am I going wrong
 

Note that M3 is diode-connected so that it's effectively a resistance. M1 is configured to be a common source amp, but M2 is configured to be a common gate amp.
 

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