An analog to digital converter (ADC) containing a sub-ADC to resolve at least some of the bits using successive approximation principle (SAP), while providing various improvements. According to one aspect, another sub-ADC is used to resolve some of the bits in parallel. According to another aspect, the...http://www.google.de/patents/US7796077?utm_source=gb-gplus-sharePatent US7796077 - High speed high resolution ADC using successive approximation technique