Literature: 		Spice Newsletter
Description: 		Technical publication describing applications of the SPICE circuit simulation program
Price:	 		FREE
Featured Topics:	New "C" AHDL, 30 IGBT Inverter
Other Topics:		New "C" Code Models Speeds 4046 PLL Sims, ICAP/Lite upgrades,   AD and Comlinear parts, CP Clare Optocoupler
Contact:		Charles Hymowitz - Vice President intusoft   (310) 833-0710, Fax (310) 833-9658


FREE SPICE Newsletter Discusses NEW AHDL Language

The Intusoft Newsletter is a unique FREE publication dedicated to
discussing topics related to the SPICE circuit simulation program. 
The October 1994 contains several application notes designed to help
engineers simulate circuits more effectively.

The first article discusses new Analog Hardware Device Language
(AHDL) based on "C".  Due to improved development tools and the
change from Fortran to C, SPICE developers have been able to extend
Berkeley SPICE by adding new models, analyses, and graphical user
interfaces.  Beginning with a release this December, Intusoft will
offer a true AHDL that allows users to develop SPICE models (code
models) using C.  This release incorporates extensions of Georgia
Tech's XSPICE integrated with our IsSpice4 simulator.

Since the XSPICE interface for C code modeling is publicly available,
all models written for it are transportable to any other simulator
that supports code model interface.  Intusoft's version accesses the
C code models via a Windows DLL.  This alleviates the need to
recompile the SPICE executable each time a new model is added. 
Addition of the DLL feature allows models to be easily distributed
and copied by developers and users and copy protected by the
programmer if required.  Trading and/or buying code model libraries
provided the means to greatly expand the capabilities of SPICE, even
for those not interested in developing their own code models.

The second article describes the advanced model for IGBT devices
using a 3 phase inverter as an example.  Unlike behavioral models
used by other SPICE vendors, the Intusoft IGBT exhibits more
important effects such as accurate switching losses and non linear
turn-on/turn-off.  Behavioral modeling of power semiconductors is
possible with IsSpice4 and can greatly speed a simulation.

The Intusoft Modeling Corner, a regular column in the newsletter,
discusses an application note using the dual opto-isolator model from
CP Clare.

A floppy disk containing all of the schematics and SPICE models in
the newsletter along with several opto-isolator models, and over 55
new op-amp models from Analog Devices and Comlinear.  The new op-amps
include current voltage and feedback op-amps such as the CLC402,
CLC426, and OP113, buffers such as the AD588 and AD680, and
instrumentation amps such as AMP04.

A yearly subscription service of the Intusoft Newsletter is
available.  The Intusoft Newsletter is the only regularly scheduled
publication dedicated to SPICE modeling and analog circuit
simulation.  The peak newsletter circulation is currently at 34,000
readers in over 110 countries.  