[SI-LIST] Re: Ansoft Q2D vs. Q3D
- From: Ray Anderson <ray.anderson@xxxxxxxxxx>
- To: "Yassin, Adnan" <adnan.yassin@xxxxxxxxx>, steve weir <weirsi@xxxxxxxxxx>
- Date: Fri, 20 May 2011 12:24:06 -0700
If the width is changed to 50um instead of the 15um you originally specified
then Polar gets the following:
> G(mS/m) C(pF/m) R(ohm/m) L(nH/m)
Polar 1.13 108 125 304
Q2D Design 6.81 108.0 123.85 304.14
Aside from G the RLC numbers are very similar to Q2D
G is probably different because I assumed a different tanD.
-Ray
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Yassin, Adnan
Sent: Friday, May 20, 2011 12:10 PM
To: steve weir
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Ansoft Q2D vs. Q3D
Steve,
The trace width is 50um, so according to your calculations, L is roughly
760nH/m. I am getting 611nH/m from Q3D. However, Q2D and mathematical equations
give much lower L.
Thanks,
-Adnan
-----Original Message-----
From: steve weir [mailto:weirsi@xxxxxxxxxx]
Sent: Friday, May 20, 2011 12:00 PM
To: Yassin, Adnan
Cc: si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] Ansoft Q2D vs. Q3D
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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