The Delay-Locked Loop [A Circuit for All Seasons]

摘要

Delay-locked loops (DLLs) can be considered as feedback circuits that phase lock an output to an input without the use of an oscillator. In some applications, DLLs are necessary or preferable over phase-locked loops (PLLs), with their advantages including lower sensitivity to supply noise and lower phase noise. This article deals with fundamental DLL design concepts.