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giri_lp,
The exact expression for the maximum DC gain for the inverting configuration is, (where G is the open loop gain of the Op-Amp):
.
A = 1/((1/G) + (Ri/Rf)((1/G)+1)))
So the maximum achievable gain, which occurrs when Ri/Rf = 0, is equal to the open loop gain loop gain G. The 1/G factors can only be ignored when the desired closed loop gain is much smaller than the open loop gain. In this case, the above expression reduces to A = Rf/Ri.
regards,
Kral
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