Expansion technology for non-linear clock and data recovery circuit dynamic capturing and tracing range

The present invention adopts technology of non-linearity clock and data recovery circuit dynamic capturing and trace range spreading. The aim of decreasing phase difference is finally reached based on phase difference between collecting data and VCO clock producing corresponding advanced or lagging pulse through current pump adjusting VCO phase. Collection of phase difference is fully decided by switching test of signal logic level, dynamic phase decision circuit can produce response pulse that changes VCO phase to break away blind zone and rapidity lock in normal locking situation, even if dynamic phase decision circuit fall into blind zone with any reason, this can not make VCO setting drift, so losing lock can be avoided effectually. The present invention extends capturing and tracing range of loop circuit greatly, and improves reliability of recovery data. Accordingly, the present invention can reduce the demand of frequency locking circuit, improve reliability of recovery data and reduces error rate effectually especially in high ratio transmitting process.