[SI-LIST] Re: Modeling Cable
- From: ronald miller <ron@xxxxxxxxxxx>
- To: ray.anderson@xxxxxxxxxx
- Date: Mon, 09 Jul 2007 23:16:53 -0700
Hi Ray
I have had some success in capturing TDR data with differential TDR head
and then fitting the rise and fall slopes in ADS using a frequency
dependent model that Agilent
recommended The model was developed by a couple guys using ADS and they
wrote an IEEE
paper.
Their model was for a lossy PCB, but if the parameters are adjusted to
match the TDR
it works OK. Some trial and error.
Ron
Ray Anderson wrote:
>Srivats-
>
>Using the physical characteristics on the RG400U data sheet:
>
>http://www.repic.co.jp/contents/products/huber/seihin/rf/pdf/rg400u.pdf
>
>
>and the procedure describe in the following paper by Richard Wheeler:
>
>http://www.wheeler.com/technology/technicalpaper2/technicalpaper2.pdf
>
>
>you should be able to synthesize a spice (or other simulator) compatible
>model that accounts for loss as well as impedance. With a little thought
>you could probable back the RLGC parameters out of the data as well.
>
>If you have access to Agilent LineCalc or the field solver in Hspice (or
>other similar field solver) you can create a model from the physical
>dimensions and material properties.
>
>
>Or you could measure the cable with either a VNA or a TDR and synthesize
>a model from the measured data (or use the s-parameters directly).
>
>Lots of possibilities, the details are left to the interested
>student.....
>
>-Ray
>
>Xilinx Inc.
>
>
>
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
>On Behalf Of Srivats Partha
>Sent: Monday, July 09, 2007 2:35 PM
>To: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Modeling Cable
>
>Hello Gurus
>I have a pasternac RG 400/U cable. We are using this to hook a 3 ghz
>scope to a CDM ESD tester. I want to model this cable in Cadence
>environment . I have used the LMG tool in cadence previously , it does
>not seem to have a option to model co axial cable, the tool has options
>to model only a strip line, micro stripline , CPW and a sub loss line.
>Under what category should I put this RG 400/U cable , Is it a coaxial
>cable? If so any hints on generating a RLCG matrix for this cable so
>that I could plug into the MTLINE model in spectre environment and use
>it for simulations? else any suggestions on how I should go about
>modeling this structure?
>Regards
>Srivats
>=20
>--
>I have no special talents. I am only passionately curious. AE
>
>
>
>
>
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--
Ronald Miller
Ghz Data, Signal Integrity Consulting
7721 Sunset Ave.
Newark CA 94560
tel 510-793-4744
cell 510-377-9380
fax 510-742-6686
www.ghzdata.com
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