[SI-LIST] 答复: single RLC parameters at a certain frequency
- From: Rui Yang <rui_yang@xxxxxxxxxx>
- To: 'xuzhengrong' <Zhengrong.Xu@xxxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Tue, 20 May 2008 13:32:25 +0800
Hi, Zhengrong,
Transmission line RLGC model comes from unit length transmission line
equivalent circuit, in which each element has its own physical meaning, =
it
should help you to interpret.
The main difference between distributed element and lumped element is =
the
propagation/flying time, where there is no flying time for lumped =
element,
while flying time is taken into consideration for distributed element.
While for package model, under assumption the electrical length of
interconnects inside package is less than one tenth of wavelength, we =
can
treat them as lumped element. R represents interconnects conductor loss, =
L
represents interconnects inductance, C represent the interconnects
capacitance, G is negligeable here.
Hope it helps!
Regards,
Rui Yang
Hardware R&D Dept., CPD., HUAWEI TECHNOLOGIES CO.,LTD. huawei_logo
Address: Huawei Industrial Base
Bantian Longgang
Shenzhen 518129, P.R.China
Tel: +86-0755-89651191
Mobile: +86-13924626970
E-mail: rui_yang@xxxxxxxxxx
www.huawei.com
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=D6=F7=CC=E2: [SI-LIST] single RLC parameters at a certain frequency
Hi,
To simplify the model, we often extract single RLGC parameters from the
s-parameter model at a certain frequency.
I wonder what on earth the meaning of the single frequency parameters =
is.
First, if the parameters only represent the magnitude and phase of the
S-parameter model at the frequency point, it may have different =
combinations
of RLGC to reach the same goal, what's the method or principle?
Second, if the parameters are meaningful at a certain frequency, why can
single RLGC parameters often be used to estimate characteristic of =
package
model such as IBIS? =20
In my opinion, for example, the single RLGC model should be the =
first-order
approximation to the real model for transmission line, as Eric's book
'Signal Integrity: Simplified' said.
It is equivalent to the real model within low frequency range and we can =
use
it if the signal frequency component is within the range.
However, if the RLGC model extracted at a certain frequency is only
meaningful for the extracting frequency, it isn't the first-order
approximation for the transmission line.
So we can't use it as the first-order approximation and estimate its low
frequency characteristic.=20
Appreciate any idea and discussion for the problem.
Best Regards,
Zhengrong=20
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