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How to calculate input impedance of cmos inverter using HSPICE?

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arnabbiswas_ece

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i want to calculate input impedance of cmos inverter i.e. gate impedance using HSPICE.But i can not connect any current source to gate.It is giving error.So suggest me a way to calculate it.
Thanks in advance.
 

Put Vdc+Vac in series to the gate of inverter. Then run ac smiulation and then the input impedance is Zin(jw)=1/Iac(Vdc) provided that vac=1.
 

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