[SI-LIST] Re: Via modeling shows strange behavior
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 29 Feb 2012 09:34:06 -0800
This falls under "The Joy (or lack thereof) of Simulation". See
Wolfgang's earlier comments, particularly with respect to the ground box
that likely ties all your planes together.
Steve.
On 2/29/2012 9:19 AM, Ravinder.Ajmani@xxxxxxxxxxxxxx wrote:
> Hi Experts,
> I am doing via modeling using Cadence PCB SI GXL. I have a 6-layer
> stackup, and via is connecting the interconnect from Top layer to Layer 3,
> with Layer 2 as Ground. I modeled the via with a single Ground via placed
> at the closest distance the tool will allow, and then modeled the same via
> without the Ground via. The Insertion Loss and the Return Loss for the
> Single via are about 15 - 20% better then the Ground coupled via. I am
> puzzled with the results. I will appreciate if you can help me understand
> the reason for this.
>
> Thanks.
>
> Regards,
> Ravinder Ajmani
> Server PCB Development
> Hitachi Global Storage Technologies
>
>
> Email: Ravinder.Ajmani@xxxxxxxxxxxxxx
>
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