Current / voltage basic conversion circuit composed of operational amplifier

Published:2011/7/6 7:45:00 Author:Lucas | Keyword: Current conversion , voltage conversion , basic, operational amplifier | From:SeekIC

Figure 1-36 (a) shows the current / voltage conversion circuit composed of a single operational amplifier. As the op amp input bias current is not zero, it will produce conversion error. For example, the op amp μA741's bias current IB ≈ 80nA, even if the allowable error is 1%, the minimum switching current is about tens of μA; for Bi-FET input op-amp, IB is about tens of pA, and the minimum switching current is available to a few nA. For the J-FET input op amp, the bias current has a positive temperature coefficient, when the junction temperature increases by 10 ℃, the bias current is increased to 2 times.



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