design op-amp in weak inversion

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utddd

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Hi all,

I'm designing an OTA in weak inversion using cadence. I found the threshold voltage of each transistors working in weak inversion are different and they are also changing with applied gate-source voltages. Does anyone know how it happens?

Thanks in advance!
 

It is very difficult to control the transistor in sub-threshold/weak inversion since the current equation is exponential and varies wildly and everything else varies too.

What topology are you trying to implement?
 

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