# RE: [SI-LIST] : A basic question

From: Jian Zheng ([email protected])
Date: Fri Mar 17 2000 - 08:39:02 PST

Hi,

If the transmission line has only one single dielectrics, the product of L
and C is a constant. There is no way you can change the product. Otherwise,
you will get your TEM wave running faster or slower than the light speed in
the dielectrics. However, if you have multiple dielectrics, you can still
much you do, you can not make the 1/SQRT(LC) > Cmax and 1/SQRT(LC) < Cmin,
where Cmax is the light speed at the dielectrics with the minimum EPSr*MUr
(permittivity & permeability) and Cmin is the light speed at the dielectrics
with maximum EPSr*MUr. Thanks!

Best regards,

----------------------------------------------------------------------------
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Jian-X. Zheng, Ph.D
Zeland Software, Inc., Web: http://www.zeland.com
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> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Peterson, James F
> (FL51)
> Sent: Friday, March 17, 2000 5:01 AM
> To: '[email protected]'
> Subject: [SI-LIST] : A basic question
>
>
> SI List:
>
> I have a question about the relationship between Z and Pd (prop.
> delay). The
> equations used for these two are :
> Z=(L/C)^(1/2)
> and
> Pd=(LC)^(1/2)
> I guess my question has to do with Pd. How can we equate Pd to both the
> above equation and the fact that the speed of light is C/((er)1/2)? Which
> says that prop. delay is just a function of the dielectric
> constant (or the
> material that light is propagating through).
> Can I really reduce C, without increasing L, and thus reduce the Pd of an
> interconnect? If I can't then the Pd=(LC)^(1/2) has problems. If
> I can then
> how does it align with light's speed being just a function of the medium
> it's traveling through?
>
> regards,
> Jim
>
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