Method and apparatus for constant output impedance, variable pre-emphasis drive
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United States of America Patent
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Nov 25, 2014
Grant Date -
Feb 6, 2014
app pub date -
Aug 1, 2012
filing date -
Aug 1, 2012
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Abstract
A population of drivers is provided in parallel to a driver output and a population of pre-emphasis path drivers is provided in parallel to the driver output. The population of drivers is updated and the population of pre-emphasis path drivers is updated in an inverse relation to the updating of the population of pre-emphasis path drivers. Optionally, the population of drivers has an initial value of n and the population of pre-emphasis path drivers has an initial value of m, and the sum of n and m is P. Optionally, the updated population of n is n′ and the updated population of m is m′, and n′ is approximately equal to P−m′.
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