A circuit includes a successive approximation register A/D converter for performing analog to digital conversions. The register has a ground pin and a ground sense pin. The ground sense pin is connected to a ground port of the circuit. A multiplexer connects the ground sense pin of the successive approximation...http://www.google.de/patents/US7411538?utm_source=gb-gplus-sharePatent US7411538 - SAR analog to digital converter having multiplexable ground sense pin
