- #1
Kaguro
- 221
- 57
- TL;DR Summary
- I think negative feedback should converge the inputs exactly same.
In an op-amp with negative feedback, say initially the + input has some small positive value and the - input is at 0. Then the op-amp amplifies this difference, and a part of it is fed to the - terminal through resistances. This will increase - and will lessen the difference.
My question is, why does this ever stop? I think this should go on until, the they are exactly 0, and then the output will become 0.
If this happens, and it happens quickly, how does an op-amp amplify any signal at all? It should always focus on keeping inputs same quickly leading to 0 output.
My question is, why does this ever stop? I think this should go on until, the they are exactly 0, and then the output will become 0.
If this happens, and it happens quickly, how does an op-amp amplify any signal at all? It should always focus on keeping inputs same quickly leading to 0 output.