Lock-Acquisition Scheme for Arbitrary Replica Delay in High-Speed DLLs

초고속 DLL에서 임의의 replica delay에 적응하는 lock 획득을 위한 회로기법

This paper described a replica-delay adaptive lock-acquisition scheme for high-speed DLLs. The proposed scheme provides the fast and correct locking cycle that is variable according to the magnitude of the arbitrary replica delay (fixed delay). The scheme guarantees the wide operation range and the fast lock-aquisition time. It has been confirmed by HSPICE simulations in a 0.35${\mu}{\textrm}{m}$ CMOS process.