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          University of California at Santa Cruz
Baskin Center for Computer Engineering and Information Sciences 

The following technical report is available electronically or as
a paper copy.  Instructions for getting either follow the abstract.


UCSC-CRL-92-48   (available electronically, as ucsc-crl-92-48.tar.Z)
S-PARAMETER BASED MACRDO MODEL OF DISTRIBUTED-LUMPED NETWORKS USING
EXPONENTIALLY DECAYED POLYNOMIAL FUNCTION
Haifang Liao, Wayne Wei-Ming Dai, Rui Wang, and Fung-Yuel Chang
November 1992, 20 pages (paper copy $5.00)

Abstract:  A Scattering-Parameters (S-Parameters) based macromodel of
distributed-lumped networks is presented.  The networks can include
capacitive cutsets, inductive loops, RLC meshes, and loss transmission
lines.  An efficient network reduction algorithm is developed to reduce
the original network into a network containing one multiport component
together with the sources and loads of interest.  The S-Parameters of
the circuit components are approximated by Taylor series to simplify
the reduction process.  Exponentially Decayed Polynomial Function
(EDPF) approximation is used to derive the macromodel, the higher
accuracy can be obtained by selecting time constant according to an
error criterion.  The macromodel is always stable for a stable system
and very flexible that the accuracy of the model can be controlled by
adjusting the order of approximation.  The experimental results
indicate that our model can approach the accuracy of SPICE with one
or two order less computing time.
Keywords: scattering parameter, macromodel, multiport component,
multiport interconnect node, component merging, network reduction,
capacitive cutsets, inductive loops, RLC meshes, lossy transmission
line, delay and Taylor series.


This technical report is available electronically through either 
of the following methods:
1.  through anonymous ftp from ftp.cse.ucsc.edu, in /pub/tr. Log in 
    as "anonymous", use your email address as your password, specify 
    "binary" before getting the file.  Uncompress and un-tar before printing.

2.  by mail to automatic mail server rnalib@ftp.cse.ucsc.edu.
    Put this command on the subject line or in the body of the message:
	@@ send ucsc-crl-92-48.tar.Z from tr
    To get the index or abstract list:
	@@ send INDEX from tr
	@@ send ABSTRACTS.1992 from tr
    To get the list of the tr directory:
	@@ list tr
    To get the list of commands and their syntax:
	@@ help commands

Order paper copies from:  Technical Library, Baskin Center for Computer 
Engineering & Information Sciences, UCSC, Santa Cruz  CA  95064.
Purchase orders are not accepted.  Checks or money orders must be
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