Hi all,
for the PDN simulation I placed the Port[1] at the output pin of the VRM
(voltage regulator module)
and
the Port[2], Port[3], ... Port[11] at the IC power pins.
The PDN with only 10 IC power pins is only a simplified example, of course, in
the "real world" there are more IC power pins.
The power integrity simulation software is able to calculate the self-impedances
Z[1,1] at the VRM
and
Z[2,2], ... Z[11,11] at the IC.
There are the diagonal elements of the impedance matrix.
The elements Z[1,2], Z[1,3], ... Z[1,11] are the trans-impedances between the
VRM and each IC power pin.
In generally, the PDN requirements in the IC data sheet contain only ONE
parameter - Z value @ Freq. -
without to specification "self"- or "trans"-impedance.
MY QUESTIONS:
1) What is the physical significance of the trans-impedance between two IC
power pins ? For example Z[2,9]
2) The IC provider can `t answer the question "what impedance do you mean,
self- or trans-impedance?" The standard answer is "only the impedance". So the
discussion with the IC provider is a "dead end street". I am confuse ... what
impedance is significant, self- or trans-impedance ?
Best regards,
Liviu Craciun
Harman Becker Automotive Systems GmbH
Karlsbad, Germany
P.S.
I expected from the IC provider TWO impedances as specifications, self- and
trans-impedance,
But
I received ONLY ONE value. It is unknown if the spec means the self- or the
trans-impedance.
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List forum is accessible at:
http://tech.groups.yahoo.com/group/si-list
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu