All-digital spread spectrum clock generator

Details All-digital spread spectrum clock generator All-digital spread spectrum clock generator

2011-04-12

2011-04-12

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S155000

Reexamination Certificate

active

07924193

ABSTRACT:
An embodiment of the invention relates to an all-digital spread spectrum clock generator comprising a phase detector, a time-to-digital converting unit, a digital loop filter, a delta-sigma modulator and a digital controlled oscillator. The phase detector receives a reference signal and a clock feedback signal to output first and second difference signals. The time-to-digital converting unit comprises timing amplifier to receive and amply the first and second difference signals to generate digital data. The digital loop filter receives and accumulates digital data to output first and second digital data. The delta-sigma modulator receives the second digital data to generate a resolution tuning word. The digital controlled oscillator adjusts its frequency of output clock signal according to the first difference signal, the second difference signal and the first digital data, and adjusts a resolution of the digital controlled oscillator according to the resolution tuning word.

REFERENCES:
patent: 7570182 (2009-08-01), Sheba et al.
patent: 7583152 (2009-09-01), Zhang
patent: 7791385 (2010-09-01), Huang et al.

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