[SI-LIST] Re: Using W-element in Spectre
- From: "Linda Zhang" <lindazhang_si@xxxxxxxxxxx>
- To: vats123@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Mon, 31 Jul 2006 14:35:17 -0600
Hi Srivats,
Thank you for your reply. I am trying the LMG now. It works great till I use
sublossline to include the dielectric loss. There are two options --lossy
wideband and lossy narrowband. If I choose wideband, the transient sim
doesn't run and error says the circuit is unstable. The narrowband model
works but it is not what I want. I want the performance from DC to the fmax,
not only one frequency.
I wonder if you have seen this problem before. Any way we can solve this
problem? Thank you very much.
regards,
Linda
>From: Srivats Partha <vats123@xxxxxxxxx>
>Reply-To: vats123@xxxxxxxxx
>To: lindazhang_si@xxxxxxxxxxx, si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Re: Using W-element in Spectre
>Date: Tue, 18 Jul 2006 22:47:11 -0700 (PDT)
>
>Hello Linda
>I had a similar problem, Instead there are two things I think you could do
>1) There is a tool called LMG in cadence that generates the RLCG matrix
>for a given geometry. So take the geometry from your WLINE model plug it
>into this tool and it will give you the corresponding RLGC values. Than you
>should highlight "use external model file" in the MTLINE dialog box. Once
>that is done you have to plug that file generated by this tool that has the
>RLGC matrix into your MTLINE model.It looks like the MTLINE can only
>understand that and not the wline model directly.
>
>2) You can look at the in the Spectre RF documentation under the heading
>"Modeling transmission lines" they give you a step by step procedure on how
>to use this tool do the simulations.Once thats done you can compare the
>frequency response of you wline model and this model generated by LMG to
>confirm . Also be sure to plug in the loss tangent values correctly. You
>could also use a 2D solver to compare the results.
>
>I found this tool very good and the results obtained were comparable to the
>wline model.hope this helps
>
>srivats
>---
>
>Linda Zhang <lindazhang_si@xxxxxxxxxxx> wrote: Hi all,
>
>Does anyone know how to use W-element model (generated from Apsim RLGC) in
>Cadnece Spectre. I tried using 'mtline', but I am not sure what format the
>'RLGC data file' should be. I can put in the numbers of 'R/L/G/C matrix per
>unit length' manually. It runs but the result is strange. I don't know if I
>can trust it.
>
>Did anyone use it before? Thank you in advance.
>
>Linda
>
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