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GNUCAP(1)			  Debian GNU			     GNUCAP(1)

       gnucap -	GNU Circuit Analysis Package

       gnucap [-b filename] [-i	filename]

       GNUCAP  is  a general purpose circuit simulator.	 It performs nonlinear
       dc and transient	analyses, fourier analysis, and	ac analysis linearized
       at an operating point.  It is fully interactive and command driven.  It
       can also	be run in batch	mode or	as a server.  The output  is  produced
       as  it simulates.  Spice	compatible models for the MOSFET (level	1,2,3)
       and diode are included in this release.

       Since it	is fully interactive, it is possible to	make changes  and  re-
       simulate	 quickly.   The	interactive design makes it well suited	to the
       typical iterative design	process	used it	optimizing a  circuit  design.
       It  is  also well suited	to undergraduate teaching where	Spice in batch
       mode can	be quite intimidating.	This version, while  still  officially
       in  beta	test, should be	stable enough for basic	undergraduate teaching
       and courses in MOS design, but not for bipolar design.

       In batch	mode it	is mostly Spice	compatible, so it is often possible to
       use the same file for both GNUCAP and Spice.

       The analog simulation is	based on traditional nodal analysis with iter-
       ation by	Newton's method	and LU decomposition.  An event	queue and  in-
       cremental  matrix  update  speed	up the solution	for large circuits (at
       some expense for	small circuits).

       It also has digital devices for mixed signal simulation.	  The  digital
       devices may be implemented as either analog subcircuits or as true dig-
       ital models.  The simulator will	automatically determine	which to  use.
       Networks	 of  digital devices are simulated as digital, with no conver-
       sions to	analog between gates.  This results in digital circuits	 being
       simulated  faster  than on a typical analog simulator, even with	behav-
       ioral models.  The digital mode is experimental and needs work.	 There
       will be substantial improvements	in future releases.

       Two command-line	options	are available. Only one	of these may be	speci-
       fied. If	no parameters are given,  gnucap  will	start  in  interactive

       -b filename
	      execute the commands in the named	file then exit (batch mode)

       -i filename
	      execute  the commands in the named file then go into interactive

       See /usr/share/doc/gnucap/bugs for a list of known  bugs	 in  this  re-

       GNUCAP  is an ongoing research project.	It is being released in	a pre-
       liminary	phase in hopes that it will be useful and that others will use
       it  as  a thrust	or base	for their research.  I also hope for some com-
       ments that may help me direct my	research.

       GNUCAP is being written by Albert Davis <>

       This manual page	was written by Jon Rabone <>  and	 main-
       tained  by Hamish Moffatt <> for the Debian package of
       gnucap.	  For	the   full    LaTeX    documentation,	 please	   see

Debian Project			 November 2001			     GNUCAP(1)


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