Bandgap stability with opamp offset

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crystalballs

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bandgap stability

Hi all,


**broken link removed**

In this bandgap the startup circuit works fine untill I apply an offset (vos) to the opamp.
With a positive offset, all it's ok but witha negative one the loop becomes open!
Why does it happen?
Any suggestion to avoid this bad behavior, please?

TIA,
CBs
 

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