[SI-LIST] Re: How to simulate length mismatch of PCB traces
- From: steve weir <weirsi@xxxxxxxxxx>
- To: yc2158@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Wed, 29 Mar 2006 13:30:06 -0800
YongJin, if I understand you correctly, you would like to see skew
effects from lines with mismatched lengths. Just build a SPICE
simulation with different W elements of like impedance but different
lengths. Alternatively, you can just calculate the timing difference
from the material effective eR and the length offset.
Steve.
At 12:38 PM 3/29/2006, YongJin CHOI wrote:
>Dear SI members,
>I am looking for a simple simulation method to get a
>rough idea if one or two of the four traces is a
>little bit longer like 1~2mm. The transmission line
>models I am having are W-model from Hspice field
>solver(2-D) and S-parameter model from HFSS. I can use
>Hspice or Spectre depending on the simplicity.
>Any comments would be appreciated.
>Thanks,
>
>Yongjin CHOI
>
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