[SI-LIST] Re: lumped model vs distributed model
- From: "Clewell, Craig" <cclewell@xxxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 3 Dec 2001 15:11:23 -0500
Jason,
I couldn't let you walk away from this topic without adding to your last
statement below.
Your initial question was what is the difference between lumped vs.
distributed. I and others have tried to answer that it similar, but
different ways. Due to the nature of your question I initially tried to
simplify things by not clouding the picture with the lossy T-line mechanisms
(conductor and dielectric). But, since they have now been introduced...you
shouldn't go away thinking that a distributed model is not lossy. The
choice is yours and it depends on what you are looking for. If all you want
is the delay through something then you may not want to include the losses.
However, if you are looking for ac characteristics like insertion/return
loss then you should add the losses into your distributed model.
Craig
-----Original Message-----
From: Jason D Leung [mailto:jleung@xxxxxxxxxxxxxxx]
Sent: Monday, December 03, 2001 8:58 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: lumped model vs distributed model
Hi all,
thanks all for the participation, I have got a better understanding now.
So depends on the application, if the rise time is small and the time delay
is large , for our example we are talking about 100 ps rise time and 1m of
something with a time delay of 6.23ns ,then we have to chop the lumped
model into " distributed model" .
However, the "distributed model" is not freq dependent eh, but it already
capture most of the discontiunity.
thanks
Jason Leung
Jason D Leung wrote:
> Hi everyone:
> For transmission line we can always use a lumped R,L,C model to
> represent a simple transmission line, or we can use a distributed model
> .(I know that the distributed model is more accurate and for high freq
> application we should use this model)
> But my question is : what is the main difference between the lumped
> model and distributed model?
> If we are just using the lumped model for our SI simulation, what are we
> going to miss ?
> looking forward for your insight
> thanks
> Regards
> Jason Leung
>
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