Adaptive frequency detector of phase locked loop

Details Adaptive frequency detector of phase locked loop Adaptive frequency detector of phase locked loop

2008-05-06

2008-05-06

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

C331S016000, C331S175000, C331S00100A, C369S044130, C369S044280, C369S047280

Reexamination Certificate

active

10905904

ABSTRACT:
An adaptive frequency detector used in a phase locked loop for detecting a frequency difference between an input signal and an output clock generated from an oscillator of the phase locked loop includes: a frequency comparator for generating an up signal or a down signal according to the frequency difference between the input signal and the output clock; and a pulse controller coupled to the frequency comparator for generating a charge signal based on the up signal or generating a discharge signal based on the down signal. The pulse controller dynamically adjusts the pulse width of the charge signal or the pulse width of the discharge signal.

REFERENCES:
patent: 6147530 (2000-11-01), Nogawa

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