input voltage for op amp

joeyd999

Joined Jun 6, 2011
4,376
There is nothing to "prove". This is by definition for an op amp operating closed loop. Actually, there will be a small difference (ignoring input offset voltage) due to the finite open loop gain. The difference * (open-loop gain) = output. The open-loop gain is usually so large that it can be ignored in most cases, and the assumption that in+ = in- is valid.
 
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