[SI-LIST] Re: Ansoft Q2D vs. Q3D
- From: steve weir <weirsi@xxxxxxxxxx>
- To: "Yassin, Adnan" <adnan.yassin@xxxxxxxxx>
- Date: Fri, 20 May 2011 11:59:41 -0700
It appears that the Q3D model is inferring mutual coupling to some
structure. Perhaps your bounding box is too small.
As a sanity check, in rough numbers, for a 30um height above the plane
we should expect about 38pH/square which works out to about 2500nH/m at
15um width. That is way-off from either of the inductance/length
figures you obtained. So, something looks fundamentally wrong.
Steve.
On 5/20/2011 11:27 AM, Yassin, Adnan wrote:
> Hi Folks,
> I have a question regarding extraction data using Ansoft Q2D vs. Q3D. I have
> a simple model consists of a copper trace, 15um wide& 15um high. It is 30um
> above a reference ground. The dielectric constant of the material between the
> trace and the GND plane is 3.9. RLCG is extracted at 1.0GHz. The "RL" data I
> get from Q2D is different than Q3D for the same model (data is below). Can
> someone explain why the difference? The Q3D model is generated from Q2D model
> using "Create 3D Design" command in Ansoft. What do I need to do when
> generating 3D design from 2D design before extracting RLCG?
>
> G(mS/m) C(pF/m) R(ohm/m) L(nH/m)
> Q2D Design 6.81 108.0 123.85 304.14
> Q3D Design 6.63 108.2 82.17 611.0
>
> Thanks,
> -Adnan
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Steve Weir
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