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.
Claims21
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 sampler circuit to sample the differential phase modulated data, the sampler circuit to:
- sample the first data signal in response to a signal transition timing derived from the second data signal to generate a first output data sample;
- and
- sample the second data signal in response to a signal transition timing derived from the first data signal to generate a second output data sample.
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;
- sampling, by a sampler circuit, the first data signal in response to a signal transition timing derived from the second data signal to generate a first output data sample;
- and
- sampling, by the sampler circuit, the second data signal in response to a signal transition timing derived from the first data signal to generate a second output data sample.
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, to sample the first data signal based on timing of the second data signal to generate a first output symbol, and to sample the second data signal based on timing of the first data signal to generate a second output symbol complementary to the first output symbol.
Dependencies are inferred from the claim text.