1. Small signal analysis principle - all independent sources are replaced by their internal resistances.1. For expression (1c) : Cgs2 and Cdb5 are not in parallel with Cgd5 and Cgd1 . Besides, how to obtain (1+ gm2/gm3)*Cgd2 ?
2. For expression (1d) : Cgd4 and Cgd6 are not in parallel with Cdb4, Cdb6 and Cbs1
Finally, in paper authors are using 1V supply, which for they case is 25% higher than nominal, while you are using also 1V, which is 55% lower than nominal.
You are using 180nm process. Nominal supply for it is 1.8V. In your testbench is 1V (55.55% of 1.8)Wait, why 55% lower than nominal ?
You see using 180nm process. Nominal supply for it is 1.8V
Have you enough supply for headroom?
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