SAMPLED-DATA CIRCUITS USING ZERO CROSSING DETECTION

摘要

A sampled-data analog circuit includes a level-crossing detector (30). The level-crossing detector controls sampling switches (S22, S23) to provide a precise sample of the output voltage when the level-crossing detector senses the predetermined level crossing of the input signal. The level-crossing detection may be a zero-crossing detection. An optional common-mode feedback circuit can keep the output common-mode voltage substantially constant.