Oscillators – Frequency stabilization – Temperature or current responsive means in circuit
Reexamination Certificate
2008-04-25
2009-08-25
Chang, Joseph (Department: 2817)
Oscillators
Frequency stabilization
Temperature or current responsive means in circuit
C331S023000, C332S128000
Reexamination Certificate
active
07579919
ABSTRACT:
Architectures for compensating the frequency drift of an oscillator based frequency synthesizer circuit due to the change of temperature are disclosed. By applying a digitally controlled frequency word which represents the frequency difference between an output signal of a crystal oscillator and a temperature-compensated signal obtained from the output of a frequency synthesizer, the generated frequency signal is controlled so as to be temperature compensated over a wide temperature range. In one embodiment, a frequency locked loop is provided to perform functions to compensate for possible drifts in the reference signal. The frequency locked loop receives a digital frequency corrected control word based on at least a first parameter and a second parameter, wherein the first parameter is a combination of a fixed frequency control word and an automatic frequency correction word, and the second parameter is derived from an external source.
REFERENCES:
patent: 5126699 (1992-06-01), Kabler
patent: 2004/0146098 (2004-07-01), Eliezer et al.
Chang Joseph
Zheng Joe
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