Oscillators – Automatic frequency stabilization using a phase or frequency... – With intermittent comparison controls
Patent
1995-06-26
1996-09-03
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
With intermittent comparison controls
331 16, 331 18, 375344, 455 76, 4551832, 4551922, 455260, H03L 706, H04B 140
Patent
active
055527493
ABSTRACT:
A method for automatically compensating for accuracy degradation of the reference oscillator (170) is provided for a communication device (100). The communication device (100) is programmed with a first frequency value to detect a target carrier signal (310), and is reprogrammed with a second frequency value that is offset from the first frequency value by a particular offset factor, when the target carrier signal is not detected (320, 410). An available carrier signal is subsequently detected and its relative location information determined (420, 430, 440). The communication device is automatically adjusted to detect the target carrier signal using information derived from the relative location information and the particular offset factor (450, 460, 470, 480).
REFERENCES:
patent: 4492933 (1985-01-01), Grieco
patent: 5041799 (1991-08-01), Pirez
patent: 5063357 (1991-11-01), Williams et al.
patent: 5113416 (1992-05-01), Lindell
patent: 5170492 (1992-12-01), Moller et al.
Nowatski Thomas M.
Zambrano Keith I.
Fuller Andrew S.
Grimm Siegfried H.
Motorola Inc.
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