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since an open loop op amp has high gain,what u do is to sacrifice a portion of this gain and tradeoff with the bandwidth of the opamp,for example the BW of the 741c opamp is around 10hz,so u cannot do any useful function with such a samll BW,so u use negative FEEDBACK to increase the BW.
Ideal OP Amp has infinite gain needed for simplification of gain and other calculations of circuit. Its bandwidth is infinite. But in real world story is different. We have finite gain of about 100000-200000 and we distinguish between open loop gain and its bandwidth so as closed loop and its bandwidth. Look at some data sheet for standard op amp like 741 and you will see it.
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