raja.cedt
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hello, I guess it should be nmos rather pmos. use small signal analysis, you will get around (1/sCdecap)+(ro)+(ro*1/scdecap*gm*(1+A)), of course it depends on vdd but as long as you have vddmin the sensitivity will be very less.
Coming to simulation, you could use ac simulation, apply some ac voltage with proper dc voltage at vdd and find ac current.
Thanks, Raj.
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