Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Reexamination Certificate
2006-10-31
2006-10-31
Kinkead, Arnold (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
C331S025000, C327S156000, C327S159000, C327S161000, C375S376000
Reexamination Certificate
active
07129789
ABSTRACT:
A fast-locking apparatus and method for frequency synthesis. A transition detector receives a first pulse signal indicative that the phase of an input signal leads that of a reference signal, receives a second pulse signal indicative that the phase of the input signal lags that of the reference signal, and generates a state signal indicative of whether the first pulse signal is ahead of the second pulse signal. A pulse-width detector generates a first width signal indicative of into which range the width of the first pulse signal falls; another pulse-width detector generates a second width signal indicative of into which range the width of the second pulse signal falls. According to the state signal and the first and the second width signals, control logic generates a regulation signal for use in adjusting the frequency of the input signal.
REFERENCES:
patent: 6150891 (2000-11-01), Welland et al.
patent: 6236696 (2001-05-01), Aoki et al.
patent: 6856658 (2005-02-01), Baba et al.
Hsiao Chi-Ming
Kuo Chang-Fu
Kinkead Arnold
Mediatek Inc.
Thomas Kayden Horstemeyer & Risley
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