Self-calibrating A/D and D/A converter

摘要

A self-calibrating A/D and D/A converter operating according to the principle of charge redistribution includes a weighted capacitive primary converter network for most significant bits, a subsidiary converter network for bits of lesser significance, and a calibration and correction network. Each of the networks have capacitors. A comparator has an input connected to a node point. The capacitors of the primary converter network are each connected to the node point. A coupling capacitor is connected between the capacitors of the subsidiary converter network and the node point. Another coupling capacitor is connected between the capacitors of the calibration and correction network and the node point.