HIGH SPEED PHASE FREQENCY DETECTION INC.

摘要

A high-speed phase-frequency detection module is described to function at very high frequencies and to protect very low jitter. In one embodiement, high-speed phase-frequency detection module includes a PFD with edged-triggered asynchronous-reset true-single-hase-clocking ("TSPC") D flip-flops that have very short CLK to Q and Reset to Q time delays. In one embodiment, the high speed phase-frequency detection module includes a charge pump, without replica or feedback, that can respond to the very narrow pulses from the PFD and produce output voltages with small ripple, thus leading to low VCO output jitter.