Phase frequency detector with a novel D flip flop

Details Phase frequency detector with a novel D flip flop Phase frequency detector with a novel D flip flop

2006-09-29

2008-08-26

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

C327S218000, C327S012000

Reexamination Certificate

active

07417470

ABSTRACT:
Methods, systems and components for use with or as a phase frequency detector. The phase frequency detector stretches its output pulse, allowing the detector to operate in a more linear region. As part of the invention, a new configuration for a D type flip flop is also disclosed. In one embodiment, the D type flip flop triggers at both the rising and the falling edges of the reference input, allowing a lower frequency input to be used while having the advantages of a higher frequency.

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Jiren Yuan et al: “High Speed CMOS Circuit Technique” 8107 IEEE Journal of Solid-State Circuits, vol. 24, No. 1, Feb. 1, 1989, pp. 62-70, XP000023253, ISSN 0018-9200.

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