Phase frequency detector used in phase locked loop

Details Phase frequency detector used in phase locked loop Phase frequency detector used in phase locked loop

2006-09-05

2006-09-05

Callahan, Timothy P. (Department: 2816)

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

C327S003000, C327S012000

Reexamination Certificate

active

07102448

ABSTRACT:
A phase frequency detector used in a phase locked loop includes a phase error detecting unit for outputting phase error signals according to a phase error between a first input signal and a second input signal, and a reset unit coupled to the phase error detecting unit. The reset unit outputs reset signals according to the first and second input signals so as to reset the phase error detecting unit without delay time. Thus, it is possible to make the output timing of the phase error signal in a more precisely linear proportion to the phase error value and to enhance the sensitivity of the phase locked loop.

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