[SI-LIST] Re: PCB Trace impedance algorithms
- From: dgun@xxxxxxxxxx
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 26 Jan 2007 13:46:22 -0800
A simple answer to your question (from memory):
Field simulators usually give three impedances, Zpi, Zvi, and Zpv.
Zpi: Calculated from the power through the port and integration of
magnetic current in a loop around the port. Useful for microstrip,
stripline, and coaxial.
Zpv: Calculated from the power through the port and integration of
the E-field voltage along a user-specified path or "calibration line",
typically from the conductor to ground. Useful for coplanar waveguide.
Zvi: The geometric mean of Zpi and Zpv. Never very useful for me.
Non-FEM solvers might use a different approach, but the results
generally agree, so they probably use the same approach.
--
Daniel Gunyan
----- Original Message -----
From: "Sam Sam"
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: PCB Trace impedance algorithms
Date: Tue, 23 Jan 2007 21:03:35 -0500 (EST)
Dear all,
Thanks for all your answers. I will definitely go over the references
you mentioned to help
me more.
John,
I understand full wave field solvers provide accurate answers
compared to formulas at the
cost of the computational time. How is the impedance calculated from
the field solutions? If i
calculate my scattering parameters, is it possible to find the
impedance of the trace from that?
As you mentioned allegro uses BEM field solver, they should be able
to calculate the impedance
matrices to do that?
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