RE: [SI-LIST] : A basic question

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From: Zabinski, Patrick J. (zabinski.patrick@mayo.edu)
Date: Fri Mar 17 2000 - 06:16:01 PST


Jim,

Inductance is related to the separation between the line
and the reference plane. So, if you thin the dielectric,
you will change C as you mention (C will increase), but you
will also change L as well (L will decrease).

One point to note with this stuff is to keep track of
the units. For L, C, Pd, etc. to work out, they
need to in per-meter. If you do so, then everything
works out (i.e., don't use total lumped capacitance; it
must be distributed).

Pat

>
> Can we change C without changing the dielectric constant? Let's say we
> change the thickness between conductor and ground plane. We
> haven't changed
> L (I don't think) and we haven't changed the dielectric
> material, but we
> have changed C. So, did Pd change? If it did, then how did we
> do it without
> changing the dielectric constant?
>
>

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