Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synthesizer
Reexamination Certificate
2005-02-22
2005-02-22
Nguyen, Linh My (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synthesizer
C331S179000
Reexamination Certificate
active
06859073
ABSTRACT:
The voltage-oscillator (VCO) in a frequency synthesizer using a phase-locked loop (PLL) is calibrated during power up or channel switching. The VCO has a coarse frequency control and a fine frequency control. The coarse control consists of digital bits that are used for calibration. The coarse control is connected to the charge pump output as in a regular PLL. By searching for the optimal control setting, the center frequency of the VCO is trimmed close to the desired frequency for the PLL to lock. This allows small VCO gain without losing the tolerance of process and temperature variations. As a result, the PLL phase noise performance is improved.
REFERENCES:
patent: 6483390 (2002-11-01), Welland
patent: 6597249 (2003-07-01), Chien et al.
patent: 6741846 (2004-05-01), Welland et al.
Dai Liang
Huang Jie
Pai Hung-Chuan
Wang Kevin Hsi-Huai
H.C. Lin Patent Agent
Nguyen Linh My
Prominent Communications Inc.
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