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How to get input impedance of this one

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bageduke

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how to get input impedance

I tried to get Rin vs. frequency. It seems that the capacitance at Vin node somehow shunts Rin and form a zero. But when I used small signal analysis, I couldn't find this zero but a zero by the capacitance at Vout node.

Anyone can tell me what I think wrong?
 

sunking

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it has a zero. there is a cap between Vbias and Vin, say Cgs, which shunt with Rin
 

LaughingMAN

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Hi,

Are you going to use hand calculation to find the input impedance or simulators such as Hspice to plot the impedance?
 

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