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simulation of cmos inverter in subthreshold region help plz

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gmahajan027

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I was trying to simulate subthreshold region operation of a CMOS inverter

If I have a device of threshold voltage of NMOS =0.2volts , and I want to make a CMOS inverter with it that can operate in sub-threshold region.

plz suggest the vdd for the circuit I should use

I already used a Vdd of .150volts but could not get correct results.
Also what should be the magnitude of capacitance at output i tried using 1ff and 1e-4ff but no good results.

I will be thankful for any help..
 

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