Spread Spectrum Controller with Bit Error Rate Feedback
AssigneeInternational Business Machines Corporation
InventorsPhilip Raymond Germann, Mark James Jeanson, Jordan Ross Keuseman, Dennis James Wurth, George Russell Zettles, IV
Life of this patent
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Abstract
A spread spectrum controller that adjusts frequency range subject to a bit error rate (BER). Measuring the bit error rate (BER) at different clock frequency ranges and comparing the BER to a BER threshold. Narrowing or widening the clock frequency range based on whether the BER is above or below the BER threshold to optimize a system for both performance and compliance.
Claims20
An apparatus configured to adjust a spread spectrum on a clock in response to a bit error rate (BER) determination.
A method comprising:
- adjusting the frequency range of a spread spectrum clock such that a BER is less than a BER threshold.
A method comprising:
- initializing a frequency range of a clock in a spread spectrum controller to a first frequency range
- adjusting the frequency range of the clock with the spread spectrum controller;
- measuring a bit error rate (BER) of a data interface, wherein the BER is correlated to the adjustment of the frequency range;
- comparing said BER to a BER threshold;
- modifying an output signal of said spectrum controller based on whether the BER is greater than the BER threshold;
- and,
- repeating the adjusting, measuring, comparing, and modifying steps until said frequency range is widest such that said BER is below said BER threshold.
Dependencies are inferred from the claim text.