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A Causal Conductor Roughness Model and its Effect on
Transmission Line Characteristics
Vladimir Dmitriev-Zdorov, Mentor Graphics, A Siemens Business
Bert Simonovich, Lamsim Enterprises Inc.
Dr. Vladimir Dmitriev-Zdorov, Mentor Graphics, A Siemens Business
Bert Simonovich, Lamsim Enterprises Inc.
Dr. Igor Kochikov, Mentor Graphics, A Siemens Business
Dr. Vladimir Dmitriev-Zdorov
Principal engineer, Mentor Graphics Corporation
vladimir_dmitriev-zdorov@mentor.com | Mentor.com
Principal engineer at Mentor Graphics Corporation. He has developed a number of advanced
models and novel simulation methods used in the company’s products. His current work includes
development of efficient methods of circuit/system simulation in the time and frequency domains,
transformation and analysis of multi-port systems, and statistical and time-domain analysis of
SERDES links. He received Ph.D. and D.Sc. degrees (1986, 1998) based on his work on circuit and
system simulation methods. The results have been published in numerous papers and conference
proceedings.
Bert Simonovich
President, Lamsim Enterprises Inc.
Lsimonovich@lamsimenterprises.com | Lamsimenterprises.com | @Lamsim1
Graduated from Mohawk College of Applied Arts and Technology, Hamilton, Ontario Canada, as an
Electronic Engineering Technologist. Over a 32-year career, working at Bell Northern
Research/Nortel, in Ottawa, Canada, he helped pioneer several advanced technology solutions into
products. He has held a variety of engineering, research and development positions, eventually
specializing in high-speed signal integrity and backplane architectures. After leaving Nortel in 2009,
he founded Lamsim Enterprises Inc., where he continues to provide innovative signal integrity and
backplane solutions as a consultant. He has also authored and coauthored several publications;
posted on his web site at www.lamsimenterprises.com. His current research interests include: high-
speed signal integrity, modeling and characterization of high-speed serial link architectures.
2
Speakers
3
Skin depth defines how far a wave propagates into a conductor, hence the
thickness of the conducting layer. For metal it is:
An internal impedance of a metal conductor with smooth surface is
described by: , with .
Real (resistive) and imaginary (inductive) parts of are equal.
It is also a function of complex frequency , , for
which exists an inverse Laplace transform, thus is a causal function.
How We Model Metal Roughness: Brief Overview
Perfectly smooth metal
4
Roughness is modeled by applying a frequency-dependent factor to the
impedance of the smooth metal:
K(f) is a real function that changes from 1 (at DC) to K
max
>1 at infinite
frequency.
Resistive and inductive portions of the complex internal impedance become
larger than for the smooth metal, but remain equal to each other
Causality is not preserved, because real non-constant function of frequency
cannot be a causal function.
How We Model Metal Roughness: Brief Overview
Rough metal
(Real and imaginary parts of a causal dependence must be mutually related by Hilbert transform. However, Hilbert transform from zero
imaginary part may only produce a constant real part )
5
Modified Hammerstad:
Loss Increase Due to Metal Roughness: Some Models
Huray:
Cannonball-Huray:
A number of other models
with K(f)=>real functions
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