4-level pulse amplitude modulation transmitter architectures utilizing quadrature clock phases
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United States of America Patent
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Jan 23, 2018
Grant Date -
Jul 20, 2017
app pub date -
Apr 5, 2017
filing date -
Jul 1, 2014
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Abstract
A four-level pulse amplitude modulation transmitter and corresponding method are provided. The transmitter includes a most significant bit processing section and a least significant bit processing section. The transmitter further includes at least one termination resistor connected to respective outputs of the processing sections to provide a transmitter output. Each of the processing sections include a set of retiming latches arranged in a parallel for aligning input parallel data and providing parallel aligned latched outputs responsive to one phase of a quarter-rate four-phase quadrature clock. Each of the processing sections further includes a serializer for serializing the parallel aligned latched outputs to provide a serialized output using quarter-rates of the quarter-rate four-phase quadrature clock. Each of the processing sections also include an output driver for driving the serialized output.
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