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
> 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
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.
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