Need documents about compensation for Bandgap vol. ref.

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leonken

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I designed a conventional Bandgap voltage reference. In the transiant analysis, the output voltage oscillates.
I want to know how to analysis the feedback loop in the voltage reference circuit and how to do compensation for it.

who can provide me some documents about how to do compensation for a Bandgap voltage reference.

Thank you.
 

Hello

There are several discussion you might be interested:
just search (BGR)AND(AC) or (bandgap)AND(stablity)
some of them, I personally consider better the ieee,
becasuse they are clear and to the point.
Have fun.
 

Thanks , I need them too
 

I didn't find any good documents about this topic.
who can give me some link or documents?
Thanks.
 


Bandgaps have two feedback loops - one negative and the oher one positive, so they are prone to instability. You have to break the loop AC-wise at the output of the opamp before it splits into two loops and measure the phase margin there. Usually there is no need for special compensation schemes, you just need to split the dominant and secondary poles further apart from each other to get more phase margin.
 

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