Pulse or digital communications – Equalizers
Reexamination Certificate
2003-05-20
2008-08-05
Fan, Chieh M. (Department: 2611)
Pulse or digital communications
Equalizers
C375S316000
Reexamination Certificate
active
07408981
ABSTRACT:
Described are methods and circuits for margin testing receivers equipped with Decision Feedback Equalization (DFE) or other forms of feedback that employ historical data to reduce intersymbol interference (ISI). In one example, a high-speed serial receiver with DFE injects the correct received data (i.e., the “expected data”) into the feedback path irrespective of whether the receiver produces the correct output data. The margins are therefore maintained in the presence of receiver errors, allowing in-system margin tests to probe the margin boundaries without collapsing the margin limits. Some receivers include local expected-data sources that either store or generate expected data for margin tests. Other embodiments derive the expected data from test data applied to the receiver input terminals.
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Behiel Arthur J.
Fan Chieh M.
Perilla Jason M.
Rambus Inc.
Silicon Edge Law Group LLP
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