[SI-LIST] Re: Convergence problems with Hspice


>
>One more possibility:
>
>Sometimes convergence problems will occur when
>Ansoft package models do not have the correct connections
>made to power and ground.

Scott,

Well that was the problem, some pins in the package models
weren't tied to ground through 50 ohms.  Not only did that
take away my convergence problems but improved some of
the ringing I was seeing on the output.

Thank you all for your great responses,  it's amazing how much
information I have gotten on convergence in the past two days.

Khalid


>Be sure that power and ground pass through the model
>and have different names on the die side of the model.
>Many people mistakenly (or inadvertently) tie both the
>die side and the pin side of the model to ground.  This can
>cause all sorts of convergence problems due to the shorted
>loop.
>
>
>regards,
>
>scott
>
>
>--
>Scott McMorrow
>Principal Engineer
>SiQual, Signal Quality Engineering
>18735 SW Boones Ferry Road
>Tualatin, OR  97062-3090
>(503) 885-1231
>http://www.siqual.com
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