| 摘要 |
A preamplifier includes cascade-connected amplifying circuits, and at least one of the cascade-connected amplifying circuits includes a differential switch pair circuit, a comparator and current sources. The differential switch pair circuit has a pair of differential inputs and a pair of differential outputs. The comparator outputs a comparison signal by comparing the differential outputs. The current sources are respectively and selectively coupled to one of the differential outputs based on the comparison signal to adjust voltages of the differential outputs. A method for calibrating offset voltages in a preamplifier is also disclosed herein.
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