Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Reexamination Certificate
2005-02-22
2005-02-22
Mis, David (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
C331S011000, C331S017000, C331S045000, C331S057000, C331S179000
Reexamination Certificate
active
06859106
ABSTRACT:
A PLL circuit for comparing with a phase comparator1aphase between an input signal and one of multiphase pulse signals CK0DIV to CKNDIV used as a channel clock generated by an output of a controlled oscillator5, and controlling an oscillation of the controlled oscillator5according to a phase difference signal, comprises a frequency fixing circuit9for outputting an activating signal PCSTART for the control when the input signal is nearly equivalent to a frequency of the channel clock and has entered into a capture range of the phase comparator and a selection circuit7for selecting as the channel clock a multiphase pulse signal of a closest phase to a generating point of the input signal after generation of the activating signal, and the selection circuit7decides whether the input signal is advanced or delayed with respect to the channel clock after having selected a multiphase pulse signal as the channel clock and generates either an advance signal or delay signal according to the advance/delay of the input signal, for controlling a skew adjusting circuit8with the advance signal or delay signal.
REFERENCES:
patent: 6356158 (2002-03-01), Lesea
patent: 8-274629 (1996-10-01), None
patent: 9-326692 (1997-12-01), None
Dickstein , Shapiro, Morin & Oshinsky, LLP
Mis David
NEC Electronics Corporation
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