[SI-LIST] Re: lumped vs distributed
- From: "Lynne Green" <lgreen@xxxxxxxxxxx>
- To: <kbagga31@xxxxxxxxx>
- Date: Mon, 15 Sep 2003 18:21:59 -0400
Hello, Karan,
A lumped model is only useful as long as the length (delay) of each
lumped section is much shorter than the length (Tr,Tf) of the signal
transition.
A distributed model is valid at much faster edge rates and higher clock
frequencies than a lumped model. There are good models for lossy
transmission lines in the literature. All of the SI tools that I am
familiar with use distributed (transmission line) models.
Any good undergraduate text on transmission line theory would be a good
place to start. There are closed-form solutions that are sufficiently
accurate for hand-calculations. Numeric field solvers provide improved
accuracy over the equations.
Best regards,
Lynne
Lynne Green
Cadence Design Systems
Date: Sat, 13 Sep 2003 02:30:36 -0700 (PDT)
From: karan bagga <kbagga31@xxxxxxxxx>
Subject: [SI-LIST] lumped vs distributed
Hi Experts
=20
What are the advantages of distributed modelling over lumped modelling ?
Do present PCB CAD companies provide/extract Lumped or distributed
models for transmission lines/pcb traces ?
=20
Any reference on how can I do a distributed modelling of transmission
line ?
=20
Thanks & Regards
Karan
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