Phase modulated data link for low-swing wireline applications
AssigneeRambus Inc.
InventorsMasum Hossain, Richelle L. Smith, Carl W. Werner
Life of this patent
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Abstract
A communication system comprises a transmitter and a receiver that communicate differential phase modulated data over a wireline channel pair. The transmitter encodes data symbols by generating first and second data signals with differentially phase shifted signal transitions with respect to one another. The receiver receives the first data signal and the second data signal and samples the first data signal based on a signal transition timing of the second data signal to generate a first output data symbol. The receiver furthermore samples the second data signal based on signal transition timing of the first data signal to generate a second output data symbol.
Claims20
A chip comprising:
- a set of input nodes to receive respective first and second data signals that represent differential phase modulated data such that, for a symbol time interval, a phase shifted signal transition in the first data signal is used to encode a first binary symbol type and a phase shifted signal transition in the second data signal is used to encode a second binary symbol type;
- and
- a logic circuit configured to output an output signal based on a difference between the first data signal and the second data signal,
- wherein the output signal corresponds to the first binary symbol type responsive to the difference being a positive value and the output signal corresponds to the second binary symbol type responsive to the difference being a negative value.
A method comprising:
- receiving, by a set of input nodes, respective first and second data signals that represent differential phase modulated data such that, for a symbol time interval, a phase shifted signal transition in the first data signal is used to encode a first binary symbol type and a phase shifted signal transition in the second data signal is used to encode a second binary symbol type;
- and
- outputting, by a logic circuit, an output signal based on a difference between the first data signal and the second data signal,
- wherein the output signal corresponds to the first binary symbol type responsive to the difference being a positive value and the output signal corresponds to the second binary symbol type responsive to the difference being a negative value.
A communication system comprising:
- a transmitter circuit to phase modulate an input data symbol to generate a first data signal and a second data signal that are differential in phase, where the input data symbol is encoded based on a phase difference between the first and second data signals, and to transmit the first data signal and the second data signal over a wired link;
- and
- a receiver circuit to receive the first data signal and the second data signal over the wired link and output an output signal based on a difference between the first data signal and the second data signal,
- wherein the output signal corresponds to a first binary symbol type responsive to the difference being a positive value and the output signal corresponds to a second binary symbol type responsive to the difference being a negative value.
Dependencies are inferred from the claim text.