G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 13/34 (2006.01) G01R 13/32 (2006.01) G01R 31/3181 (2006.01) G01R 31/319 (2006.01) H04B 10/08 (2006.01) H04L 1/20 (2006.01) H04L 1/24 (2006.01)
Patent
CA 2495844
A method and apparatus to draw eye diagrams of multi-valued signals that remove non-data dependent effects is disclosed. An exemplary method includes collecting event counts at variable bit offsets, desired time offsets within one or more bit periods and desired voltage offsets within a voltage region of interest; removing non-data dependent effects from the collected event counts; generating a composite diagram of the desired time offsets within the one or more bit periods of interest and desired voltage offsets within the voltage region of interest; and displaying the composite diagram. An exemplary apparatus includes a windowed comparator operative to receive an input signal and generate an output signal having a first value if the input signal is within a desired voltage region; a sampling device, coupled to the windowed comparator, operative to sample the output signal and generate a logical signal at desired time intervals; an event array counter, coupled to the sampling device, operative to generate a count value signal representing the number of sampled inputs within one or more desired time offsets and the desired voltage regions; and a trigger processing circuit, coupled to the event array counter, operative to generate a bit offset signal that controls the counting of the event array counter in response to a test pattern signal.
Oyen Wiggs Green & Mutala Llp
Synthesys Research Inc.
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