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A 3.125Gb/s clock recovery circuit in 0.18/spl mu/m CMOS comprises a multiplying delay-locked loop (MDLL), an injection-locked slave oscillator and a phase control unit. Injection locking reduces MDLL clock distortion and varies the delay of the recovered clock, while a frequency loop in the phase control unit ameliorates the trade off between phase wander and frequency tolerance. Experimental results show high frequency jitter tolerance is improved by 0.08UI.
Date of Conference: 13-13 Feb. 2003