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question about small signal figure

 
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segabird



Joined: 11 Nov 2004
Posts: 39
Post27 Dec 2004 15:46   question about small signal figure
In the figure 3.28 of razavi's book, why the ro of M1 is absent ?
(The figure is small signal figure of soure follower and the M1 is the input NMOS.)
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