Integrated circuit with digitally controlled phase-locked loop
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United States of America Patent
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Dec 12, 2006
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app pub date -
Aug 13, 2004
filing date -
Aug 13, 2004
priority date (Note) -
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Abstract
An integrated circuit ('IC') includes a phase-locked loop ('PLL') with a controllable oscillator embedded in the integrated circuit. A phase-lock circuit provides a lock control signal to the controllable oscillator; and a digital-to-analog converter ('DAC') provides an oscillator adjustment signal to the controllable oscillator according to a digital code. The digital code is generated by an adjustment circuit configured in the fabric of a programmable logic device, or embedded in the IC, for example. In a particular embodiment, the DAC adjusts the PLL to reduce differential mode voltage in the phase-lock circuit.
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