Adjustable transmitter power for high speed links with constant bit error rate
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United States of America Patent
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Jan 28, 2014
Grant Date -
Nov 22, 2012
app pub date -
Jul 31, 2012
filing date -
Jul 7, 2008
priority date (Note) -
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Abstract
A method and apparatus for dynamically adjusting power of a transmitter is herein described. A transmitter transmits a pattern to a receiver at a differential voltage. The length of the pattern, in one embodiment, is selected to be a reasonable length training pattern, as not to incur an extremely long training phase. If errors are detected at the receiver in the pattern, the transmitter steps the differential voltage until errors are not detected in the pattern at the receiver. The differential voltage, where no errors are detected, is scaled by a proportion of a target confidence level to a measured confidence level associated with the reasonable length training pattern. As a result, a training phase is potentially reduced and power is saved while not sacrificing confidence levels in error rates in the data exchange between the transmitter and receiver.
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