High speed circuits with feedback?

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huanchou

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Dear Sir:

Could someone tell me why in some of the high speed cirucit design has the feedback loop, even the loop didn't have the compensation element.
In the other words, the circuits use the unstabled negative feedback.
What's the different of positive feedback and unstabled negative feedback?
I know the stabled negative feedback will increase the bandwith, decrease the dc gain. Does unstabled negative feedback still has the characteristic?
 

Could you point to some examples where this has been implemented? As in, where did you read about "unstable negative feedback in high speed circuits"?
 

Hi huanchou,

Well, there is almost no different between positive feedback and unstabled negative feedback? This depends on the Phase margin in your feedback loop. You could read about this in any control theory book.

Good luck!
 

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