System and method for interchangeable transmission driver output stage and low-power margining mode
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United States of America Patent
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Jul 11, 2017
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N/A
app pub date -
Nov 18, 2016
filing date -
Nov 18, 2016
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Abstract
A system, method, and circuits for power efficient margining in a differential output driver that includes segments connected to outputs of the driver. Each segment can be configured independently to different states by activating corresponding transistor combinations. In a transmitting state, the transistors transmit data by establishing current paths between the driver outputs and a positive supply rail or a ground rail. In a margining state, the transistors are statically configured to form current paths that differ from those of the transmitting state, such that the segment contributes substantially a same differential impedance between the driver outputs as would be contributed by the segment when in the transmitting state, while contributing a different common mode impedance than in the transmitting state. The current paths of the margining state extend through transistors that transmit data in the transmitting state.
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