[ibis-macro] Clarification of the Digital Input to Tx GetWave
- From: "Walter Katz" <wkatz@xxxxxxxxxx>
- To: "IBIS-ATM" <ibis-macro@xxxxxxxxxxxxx>
- Date: Sun, 25 Jul 2010 08:34:12 -0400
All,
I was asked to give an example explaining the digital input waveform to Tx
GetWave. The enclosed example (in spreadsheet form) assumes a step size of
10ps and shows several waveforms that have transitions between 95ps and
105ps. The value of the waveform at 100ps determines exactly where the
waveform crosses zero, and therefore the time of the transition. When the
value is ?0.?, the transition occurs exactly at 100ps. Simple trigonometry
can be used to determine exactly where the piecewise linear time domain
waveform crosses 0.
Currently, both Arpad?s and my BIRD states the following:
| Step 4. The simulation platform produces a digital stimulus waveform. A
| digital stimulus waveform is 0.5 when the stimulus is "high",
| -0.5 when the stimulus is "low", and may have a value between
| -0.5 and 0.5 such that transitions occur when the stimulus
| crosses 0.
If anyone thinks this wording requires improvement, please send the improved
wording directly to me or to the reflector with alternative wording.
Walter
Walter Katz
303.449-2308
Mobile 720.333-1107
wkatz@xxxxxxxxxx
www.sisoft.com
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