Questions about bandgap circuit design.

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holddreams

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The process provides the following corners:
tt_corner: mos_tt,resistor_tt,bjt_tt
ff_corner: mos_ff,resistor_ff,bjt_ff
ss_corner: mos_ss,resistor_ss,bjt_ss

The bandgap output voltage changed a lot when using different bjt corners.
However,the output voltage changed a little if bjt corner remains stable and only change the mos and resistor corner.

How should i do?

Thanks!
 

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