home *** CD-ROM | disk | FTP | other *** search
- Xref: sparky comp.lsi:816 comp.lsi.cad:1357
- Path: sparky!uunet!europa.eng.gtefsd.com!emory!swrinde!zaphod.mps.ohio-state.edu!ub!galileo.cc.rochester.edu!ee.rochester.edu!rbc!al
- From: al@rbc.uucp (Al Davis)
- Newsgroups: comp.lsi,comp.lsi.cad
- Subject: ACS circuit simulator posted to alt.sources
- Message-ID: <1993Jan28.051854.14341@rbc.uucp>
- Date: 28 Jan 93 05:18:54 GMT
- Sender: al@rbc.uucp (Al Davis)
- Reply-To: davis@ee.rochester.edu
- Organization: Huh?
- Lines: 47
-
- "ACS" (Al's circuit simulator) has been posted to alt.sources.
-
- ACS is a general purpose mixed analog and digital 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. The output is produced
- as it simulates. Spice compatible models for the MOSFET (level 2) and
- diode are included in this release. Other models (MOSFET levels 1 and 3
- and BJT) are in the testing phase.
-
- Since it is fully interactive, it is possible to make changes and
- re-simulate quickly. The traditional batch approach of repeat(edit,
- simulate, wait) is a thing of the past. This makes ACS ideal for
- experimenting with circuits as you might do in an iterative design or
- testing design principles as you might do in a course on circuits.
-
- In batch mode it is mostly Spice compatible, so it is often possible to
- use the same file for both ACS and Spice.
-
- The analog simulation is based on traditional nodal analysis with
- iteration by Newton's method and LU decomposition. An event queue and
- incremental matrix update speed up the solution considerably for large
- circuits and provide most of the benefits of relaxation methods but
- without the drawbacks.
-
- It also has digital devices, so it is a gate level logic simulator. The
- digital devices may be implemented as either analog subcircuits or as true
- digital models. The simulator will automatically determine which to use.
- Networks of digital devices are simulated as digital, with no conversions
- to analog between gates. This results in digital circuits being simulated
- faster than on a typical analog simulator, even with behavioral models.
-
- ACS also has a simple behavioral modeling language that allows simple
- behavioral descriptions of most components including capacitors and
- inductors.
-
- ACS is an ongoing research project. It is being released in a preliminary
- phase in hopes that it will be useful and that others will use it as a
- thrust or base for their research. It may be copied as per the GNU
- General Public License.
-
- ACS is available from a dial-up 716-272-1645. Login as "guest". Type
- "help" for a list of commands.
-
- I plan to put it on an anon ftp site soon. Details!.
-
- al.
-