An A/D converter having a plurality of thresholding circuits corresponding to bits of output digital data, each of which includes odd number of inverters serially connected from a first stage to a last stage. The first stage inverter of the thresholding circuits have thresholds equal to a weights of...http://www.google.com.hk/patents/US6281831?utm_source=gb-gplus-share專利 US6281831 - Analog to digital converter
