Phase locked loop with phase rotation for spreading spectrum

Details Phase locked loop with phase rotation for spreading spectrum Phase locked loop with phase rotation for spreading spectrum

2008-01-25

2010-06-22

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S156000

Reexamination Certificate

active

07741889

ABSTRACT:
A phase locked loop (PLL) with phase rotation spreading includes a phase detector, a charge pump, a filter, a voltage controlled oscillator (VCO) and a selector. The phase detector receives a reference clock signal and a feedback clock signal to thereby produce an error signal. The charge pump converts the error signal into a current signal. The filter converts the current signal into a voltage signal. The VCO produces N clock signals with a same frequency in accordance with the voltage signal, where the N clock signals have phases θ0to θN-1respectively, and θjindicates a lead of 2π/N over θj+1, for j=0, 1, . . . , N−2. The selector selects one from the N clock signals in accordance with a predetermined sequence to thereby produce a target clock signal, and finely adjusts a frequency of the target clock signal for a spreading operation.

REFERENCES:
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patent: 7321267 (2008-01-01), Salonen et al.
patent: 2006/0014513 (2006-01-01), Uozumi et al.
patent: 2006/0045205 (2006-03-01), Jensen
patent: 2006/0046663 (2006-03-01), Yu
patent: 2006/0050830 (2006-03-01), Da Dalt et al.
patent: 2006/0078079 (2006-04-01), Lu

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