Fast lock-on time mixed mode DLL with 10ps jitter

Abstract

A fast lock-on time mixed mode delay locked loop (DLL)is proposed to eliminate phase error in two steps. A digital fixed delay line compensates for the initial large phase error and an analogue voltage controlled delay line compensates for the small static phase error, resulting in low jitter. The lock-on time of the DLL is less than 10 clock cycles and the simulated jitter is below 10ps at 200MHz.