High-Frequency Phase/Frequency Detectors: Analysis for Oscillation-Free Optimal I/O

Phase/frequency detectors (PFDs), equipped with blind zone (BZ) relieving delay elements (DEs), are studied. DE design guidelines for oscillation-free optimal PFD I/O characteristics, along with detailed validation, are presented. This PFD study is useful for the design of charge-pumped phase-locked loops (CP-PLLs) that employ high-frequency input clocks.