Certain applications require that you calibrate the input offset voltage (VOS ) of a current-sense amplifier to enhance the accuracy of its current measurements. This calibration, however, is hampered by interactions between the amplifier's minimum output voltage (VOL ) and its input VOS at zero current. This article presents a simple method for “skewing” the input VOS of a unidirectional current-sense amplifier. The method lets you measure input VOS without the usual limitations due to VOL , and also improves the overall measurement accuracy.
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