[SI-LIST] Re: Using W-element in Spectre

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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