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[SOLVED] question on Razavi's Feedback question

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mathson

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Hi,
I am doing the feedback question on Razavi's CMOS IC book. In Problem 8.10(d).
razavi.JPG

In the Loop gain, why he got Rs//(gm1)-1, since I just got Rs.
Thanks.
 

When you look into the source of mosfet, you have a resistance of 1/gm. So, here, we look into the source and hence have a 1/gm, Which comes in parallel with Rs.
(refer eq 3.110. )
 
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