Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural oscillators controlled
Reexamination Certificate
2007-08-09
2009-06-16
Kinkead, Arnold (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Plural oscillators controlled
C331S046000, C331S049000, C331S179000
Reexamination Certificate
active
07548120
ABSTRACT:
A frequency switching method is used to make switching among a plurality of frequency signal sources each providing a specific frequency range covering multiple bands. The method includes steps of providing a target frequency data; selecting one of the frequency signal sources to output a first clock signal; generating a first frequency data according to the clock signal of the first frequency to compare with the target frequency data; outputting a second clock signal with the highest band of another one of the frequency signal sources possessing a frequency range higher than that of the selected frequency signal source when the target frequency data is greater than the first frequency data; and outputting the second clock signal with the lowest band of the selected frequency signal source when the target frequency data is smaller than the first frequency data.
REFERENCES:
patent: 7038552 (2006-05-01), Brett et al.
Chen Shou-Fang
Lam Tin-Sing
Lin Heng-Chih
Yang Chao-Tung
Zhou Sining
Kinkead Arnold
Kirton & McConkie
MStar Semiconductor Inc.
Witt Evan R.
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