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I've studied the golden rules of the feedback OP-AMP and applying this to voltage follower shows that voltage gain (V_{out}/V_{in}) is 1.

Thus, V_{out}should eventually follows V_{in}when V_{in}suddenly changed. I've tried to follow this process for clear feeling by drawing pictures as shown in the attached image.

(or becomes saturation value.) This divergence is even more clear when feedback equation is approximates to (VSince A_{V}is very large for typical OP-AMP, It looks V_{out}becomes divergent!_{+}- V_{-})A_{V}^{n}where n is number of looping. (You can get this approximation by looking last shown V_{out}in the image.)

What was I wrong? Why does feedback make the system crazy?

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# Question for stability of negative feedback OP-AMP

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