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a simple question about bandgap, but really troubled me

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incol

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Vx=Vbe=0.65v,so Vin of opamp is 0.65v,then M1 will cuteoff for Vth=0.712v.Vbe can't be easily changed,how can i do?
 

You may use pmosfets as input transistor of the amplifier.
 

see my answer is analog circuit board.
 

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