A method and a circuit for simple clock recovery from multi-level at high transmission rates. The circuit is compatible with standard PLL-type clock recovery techniques for NRZ and generalized two-level signalling. The timing information is extracted from a single threshold crossing, irrespective...http://www.google.de/patents/US5825825?utm_source=gb-gplus-sharePatent US5825825 - Method of processing multi-level signals for simple clock recovery
