RE: [SI-LIST] : Basic Transmission Line question

About this list Date view Thread view Subject view Author view

From: Ingraham, Andrew (Andrew.Ingraham@compaq.com)
Date: Fri Jun 01 2001 - 09:02:28 PDT


Steve Corey wrote:

> Finally, just for the sake of interest, I would mention that from a
> time-domain simulator's perspective, the concept of a distributed model
> vs.
> a lumped model is a very blurry one, since as the simulator chooses its
> time steps, every model gets effectively discretized into lumps of some
> sort.
 
Not necessarily. The simplest (lossless) transmission line model is just a
pure time delay. No need to divide it up based on the timestep size.

Some simulators do the opposite, however: they choose their timestep size
based on the shortest transmission line found in the netlist.

Conceptually, even a lossy line model could be implemented as a convolution
with the impulse response of the line, found by laplace methods, without
having to section the line into lumped elements; but I think the main
problem is that this is computationally inefficient.

Andy

**** To unsubscribe from si-list or si-list-digest: send e-mail to
majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE
si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
****


About this list Date view Thread view Subject view Author view

This archive was generated by hypermail 2b29 : Thu Jun 21 2001 - 10:12:12 PDT