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Design >> High-Speed I/O Design >> eye diagrams in cadence
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Message started by tony on Apr 20^th, 2004, 10:23pm

Title: eye diagrams in cadence
Post by tony on Apr 20^th, 2004, 10:23pm

hello

how does one make eye diagrams in cadence ? spectre or spectre rf ?

thanks

Title: Re: eye diagrams in cadence
Post by Frank Wiedmann on Apr 21^st, 2004, 4:29am

In version 5.0, there is an eyeDiagram function in the Waveform Calculator (in the Special Functions menu). See the Waveform Calculator User Guide for details.

Title: Re: eye diagrams in cadence
Post by jbdavid on Nov 2^nd, 2004, 4:56pm

You can also use verilog-A
there is an eye_diagram_generator in rfExamples - or rfLib.. this works on a timer.. but if your recieve clock is from a locked pll with some jitter model, you might want one that resets based on a trigger signal.

you might check bmslib (ships with IC5.033 and above) to if the clocked version made it in there..

this generates two signals.. a horizontal sweep and vertical signal and you use those to do plot the vertical vs the horizontal.. to see the eye diagram..

Of course if you are interested in ensuring a sufficient eye-opening, you might rather check that directly..
which requires a different verilog-A or AMS model.

Jbd