A system that generates data waveforms for transmission on a communications network includes a series of sequentially over sampled and switch current sources whose timings are locked to a master delay line and replicas thereof. The master delay is configured as a ring oscillator with its frequency looked...http://www.google.de/patents/US6721379?utm_source=gb-gplus-sharePatent US6721379 - DAC/Driver waveform generator with phase lock rise time control
