DLL-based clock recovery in a PRML channel

A DLL-based clock recovery circuit is designed to eliminate drawbacks of the VCO while maintaining the advantages of a PLL for frequency multiplication and jitter filtering. This design demonstrates that the tracking jitter is 1/20 of that of a PLL for a 1024 times frequency multiplication. The circuits are verified with PRML detectors for BD/DVD at channel bit rates of 264/478 Mb/s.