[SI-LIST] Re: Electrical length
- From: "ariazi" <ariazi@xxxxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 23 Sep 2005 12:19:18 -0700
> Is electrical length of a line related to its wavelength and rise time
> both ?
Yes,
Any parameter which is related to the signal rise time Tr can be shown =
to be
related to signal wavelength, based on following relations:
Signal rise time is 5 to 20 percent (or ~ 10%)of clock period T (where =
T
is reciprocal of frequency F)
Then:
Tr =3D 0.1 * T=20
Signal velocity V (which is inverse of signal propagation delay Pd ) is
product of=20
freqeuncy F and wavelength (Lambda) :
V =3D F * Lambda =3D Lambda/T
As an example, The length of rising edge given on page 6 of Handbook Of
Black Magic is related to rise time by:
Length of rising edge =3D Tr/Pd =3D V * Tr
It can be shown to be also related to wavelength:
Length of rising edge =3D (Lambda/T) * Tr =3D ( Lambda/T ) * 0.1 * T
Length of rising edge =3D 0.1 * Lambda
Best Regards,
Abe Riazi
ServerWorks
=20
=20
=20
=20
=20
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