calculate output capacitance

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MohEllayali

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Hi
I want to calculate the output capacitance Co of a transconductor as depicted below

**broken link removed**

the probleme i dont know how to do to calculate only Co without the contribution of the overlap capacitance
here is my schematic

**broken link removed**

the transconductor is in the middle, the inverters are there only to define the bias point, i drve the outputs differentially and calculate the imaginary part of the current drawn by the input port.

so okay, my probleme i cant figure out how to get rid of the miller capacitance and contribution

any suggestion appreciated
 

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