Help about CMOS input impedance

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sowmya005

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Hi friends,
I would like to know the calculation of the CMOS input impedance.
How is it completely capacitance load on the CMOS input ports?
Please help.

Thanks,
Sowmya
 

there is no DC path from gate to source,
so the low frequency gate input impedance is only capacitance

but at high frequency, there is impedance
 

Would u pl elaborate this in timing perspective?
In order to calculate the delay for cell made of CMOS transistors,
i read that the inputs to the CMOS cell present capacitive load only.
Why only capacitive load?
 

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