FreeLists / si-list / [SI-LIST] Re: lumped model vs distributed model

["Abe Riazi" <ARIAZI@xxxxxxxxxxx>]

Scott McMorrow Wrote:

> The operating assumption that is often made whenever RLGC parameters are
> used is that R, L, C and G are constant over frequency.  This is never
true in reality,
> and only true as an approximation for extremely low frequencies.
> Distributed constant RLCG parameters really only work if you assume
transmission
> lines that are lossless or nearly lossless.

Hi Scott:

Thanks for your instructive comments.

Lossless parameter assumptions offer simplicity and convenience, and are
thereby the preferred choice whenever feasible.  Particularly,  the
dielectric
conductance " G " is negligible in many circumstances.  As you have pointed
out, it is important to explore the reasons behind approximations and to
understand their limits. Calculating RLCG parameters analytically ( rather
than using a field solver program ) for some cases can also provide
valuable insight.

Best Regards,

Abe Riazi
ServerWorks





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