An Operational Analog to Digital (SYMAD) Convertor cell for converting an analog signal into a discrete binary code. An analog signal is processed by sample and hold circuitry and then compared to a reference voltage by a comparator. The comparator output is the converted digital output. This output...http://www.google.fr/patents/US5202687?utm_source=gb-gplus-shareBrevet US5202687 - Analog to digital converter
