Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular frequency control means
Reexamination Certificate
2006-12-26
2006-12-26
Chang, Joseph (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular frequency control means
C331S011000, C331S044000
Reexamination Certificate
active
07154348
ABSTRACT:
A frequency synthesizer is provided. The frequency synthesizer includes an adaptive frequency calibration circuit and a phase locked loop (PLL). The frequency synthesizer performs in a frequency lock mode and in a phase lock mode. In the frequency lock mode, the adaptive frequency calibration circuit compares the frequency of an input signal with the frequency of an output signal of a voltage controlled oscillator of the PLL and outputs control bits as a result of the comparison. The voltage controlled oscillator has a plurality of operating characteristic curves and selects a curve from among the plurality of operating characteristic curves in response to the control bits. In the phase lock mode, the PLL controls an output phase of the voltage controlled oscillator based on a tuning voltage from the selected operating characteristic curve.
REFERENCES:
patent: 6229400 (2001-05-01), McCollough et al.
patent: 6710664 (2004-03-01), Humphreys et al.
patent: 2002/0075080 (2002-06-01), Nelson et al.
patent: 2002-0005610 (2002-01-01), None
Hwang In-chul
Lee Han-il
Chang Joseph
F. Chau & Associates LLC
Samsung Electronics Co,. Ltd.
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