Driver supporting multiple signaling modes
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United States of America Patent
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Jun 11, 2013
Grant Date -
Dec 29, 2011
app pub date -
May 7, 2010
filing date -
May 7, 2009
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A driver supports differential and single-ended signaling modes. Complementary transistors with a common tail node are provided with complementary input signals in the differential mode. A current source coupled to the tail node maintains a relatively high tail impedance and a constant tail current in the differential mode. The tail node is set to a low impedance in single-ended modes to decouple the two transistors, allowing them to amplify uncorrelated input signals. The current source thaws multiple current levels in the single-ended mode to compensate for changes in tail current that result from changes in the relative values of the uncorrelated data in the single-ended modes. A termination block provides termination resistance in the differential mode, pull-up transistors in a single-ended mode that employs push-pull drivers, and is omitted in a single-ended mode that lacks driver-side termination.
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