A Successive Approximation Routine converter is provided in which a comparator is responsive to an output of a first Digital to Analog Converter, and an output of a second Digital to Analog Converter and to a DAC common mode output reference voltage, and wherein the comparator provides data to a SAR...http://www.google.com.hk/patents/US20080129573?utm_source=gb-gplus-share專利 US20080129573 - Differential input successive approximation analog to digital converter with common mode rejection
