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PTAT current ref positive/negative feedback

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jszair

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Could anyone explain where's the positive and negative feedback in the attached PTAT current ref?

Thanks a bunch!
 

In my opinion:
1.if x increases→ current through M1 decreases→current through M2 decreases→Y decreases。so x is negative feedback.
2.if Y increases,but I2 must equal I1 →gage of M2 increases→I1 increases→I2 increases,then positive feedback.
 
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