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How to stabilize the bias corner?

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I use high swing constant gm bias structure, in every corner,there are 300mV offset, anyway to cancel it ?
 

Could you kindly elaborate.
Are you trying to generate a voltage to bias from this andd you observe a 300mv offset.
 

no , in different technical cornor like TT,FF,SS, there is alway a offset ,maybe 300mV,maybe minus 300mV ,I want to know how to minimize it
 

Can you tell me offset in what voltage.
 

in typical tech 1.8 v, 1.17V for pmos bias , when FF and 1.62, it shrinks to 888mv
 

Thanks now I understand clearly what you mean.
The answer is donot look for that, as you cannot get it.

Other thing the constant-gm bias is to generate a biasing current. And this biasing current would vary by 100% (+ and -). Rest assured across PVT.

We take the current generated by this to all the other corners of the chip where we need the current and generate a local biasing there.
And your aim is to get the current mirrored.
 

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