A Novel High Speed, Low Power, and Symmetrical Phase Frequency Detector with Zero Blind Zone and π Phase Difference Detection Ability

This paper presents a novel symmetrical phase frequency detector (PFD) sensitive to the falling edge of input clocks. Notably, the new PFD has an open-loop structure and no reset path, since UP and DN (outputs of the PFD) are never allowed to reach logic high simultaneously. Hence, the blind zone is completely eliminated in this case. Dead zone has been reduced to a great extent about 68 fs. Meanwhile, the proposed PFD is reliably capable of...