Digitally controlled system on-chip (SOC) clock generator

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United States of America Patent

PATENT NO 7573303
SERIAL NO

11781452

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Abstract

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A clock generator includes a clock circuit and a voltage-controlled oscillator in a phase-locked loop. The clock circuit monitors input clock signals and selects one of the input clock signals based on characteristics of the input clock signals. The voltage-controlled oscillator generates a reference clock signal based on the selected clock signal. The clock circuit also includes synthesizers for generating clock signals, each of which has a frequency being a non-integer multiple of a frequency of the reference clock signal. Additionally, the clock circuit individually offsets the clock signals generated by the synthesizers relative to the reference clock signal. The clock generator is capable of switching the input clock signal during operation of the clock generator while maintaining the reference clock signal. Further, the clock generator is programmable to control operation of the clock circuit.

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Patent Owner(s)

Patent OwnerAddress
INTEGRATED DEVICE TECHNOLOGY INC6024 SILVER CREEK VALLEY ROAD SAN JOSE CA 95138

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chi, Ji Fu Shanghai, CN 2 33
Li, Yi Shanghai, CN 504 2284

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