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From: gwu@vlsi.cs.cmu.edu (George Wu)
Newsgroups: comp.lsi
Subject: Re: Crystal and Spice difficulties
Message-ID: <1083@vlsi.cs.cmu.edu>
Date: Fri, 4-Sep-87 11:58:46 EDT
Article-I.D.: vlsi.1083
Posted: Fri Sep  4 11:58:46 1987
Date-Received: Sat, 5-Sep-87 20:46:43 EDT
References: <8708272347.AA05760@oahu.cs.ucla.edu>
Organization: Carnegie-Mellon University, CS/RI
Lines: 45
Keywords: circuit extraction spice model parameters


     There are several other parasitic circuit extractors out there which try
to handle resistance better than Magic's extractor. At least a few which I
know of are:

	1) RC from Brish, Pardo, and Ben-zvi at Motorola Israel. This looks
	interesting since it has some interesting methods which don't involve
	finite elements. Primarily looks at edges to determine the direction
	of current flow.

	2) EXCL by McCormick at MIT. Here accuracy seems to have received
	the highest priority, since finite elements is used. However, there
	are some optimizations used to help cut down the extraction time.

	3) FRED by Mike Trick here at C-MU. Again, another fast(er) extractor
	which tries to find a balance of both speed and accuracy. Edges
	are used to determine current flow direction. Unfortunately, FRED is
	for NMOS only. Mike and I are working on Paratice, which will be a
	technology independent extractor based on FRED. It should be ready by
	the end of the month.

Also, I believe there is work being done at Berkeley on a new extractor which
is much more intelligent about parasitics. I think they published a paper on
it, though I'm not familiar with their work and can't really say much about
it.

     As for the Spice level two model parameters, below are the parameters I
use. they were given to me by a professor when I took is course last year. I'm
not sure where he got them from.

.MODEL CMOSN NMOS LEVEL=2.00000 LD=0.280000U TOX=530.000E-10
+NSUB=1.000000E+16 VTO=0.864362 KP=3.310097E-05 GAMMA=1.53162
+PHI=0.600000 UO=230.648 UEXP=1.001000E-03 UCRIT=999000.
+DELTA=1.23086 VMAX=65794.7 XJ=0.400000U LAMBDA=1.554857E-02
+NFS=9.977800E+11 NEFF=1.001000E-02 NSS=0.000000E+00 TPG=1.00000
+RSH=20 CG.MODEL CMOSP PMOS LEVEL=2.00000 LD=0.280000U TOX=530.000E-10
+NSUB=1.365450E+15 VTO=-0.725007 KP=1.246790E-05 GAMMA=0.628686
+PHI=0.600000 UO=100.000 UEXP=0.138792 UCRIT=13550.7
+DELTA=2.11805 VMAX=100000 XJ=0.400000U LAMBDA=4.345936E-02
+NFS=1.038954E+12 NEFF=1.001000E-02 NSS=0.000000E+00 TPG=-1.00000
+RSH=55 CGSO=4E-10 CGDO=4E-10 CJ=3.6E-4 MJ=0.5 CJSW=6.0E-10 MJSW=0.33

     I hope all this helps.

						George