Literature: 	Spice Newsletter
Description: 	Technical publication describing applications of the SPICE circuit simulation program
Price:	 	FREE
Featured Topics:Simulating Filters w/Laplace Equations, New Native Mixed Mode Simulator
Other Topics:	IEEE C62.41-1991 Test Waveforms, Free SPICE on Internet
Contact:	Charles Hymowitz - Vice President intusoft   (310) 833-0710, Fax (310) 833-9658
		E-mail 74774.2023@compuserve.com


FREE SPICE Newsletter Discusses NEW Native Mixed Mode Simulator

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

The first article discusses simulating control systems and filters
using Laplace equations.  The new IsSpice4 program allows you to
enter arbitrary Laplace polynomials that can be simulated in the
frequency or time domain.  Two examples are provided.  The first
shows how to model a speed-control servo loop, while the second
describes a model for the Silicon Systems programmable electronic
filter 32F8011.  Simulation results are provided.

The second article discusses the new mixed mode simulation
capabilities of IsSpice4.  IsSpice4 is a Native Mixed Mode simulator
incorporating both analog SPICE 3F algorithms and a 12 state digital
simulator.  A MIDI synthesizer example is simulated in the article. 
The circuit includes a digital MIDI controlled oscillator, a
frequency divider, a sampled-data filter, and a low-pass filter.  The
article shows how the digital, analog, and real types of data are
handled by the simulation algorithms.

The Intusoft Modeling Corner, a regular column in the newsletter,
discusses creation of IEEE C62.41-1991 test waveform generators for
SPICE 3.  These signal sources are useful in testing all types of
protection devices.  SPICE netlists for the sources are provided.

Intusoft has placed a FREE working copy of its ICAP/4Windows
Demonstration software on the Internet.  The software is fully
functional and can simulate circuits up to 15 components.  The demo
version includes schematic entry, SPICE 3 simulator, a small model
library, and waveform processor.  The Internet site, discussed in the
newsletter can be reached at: "fsrv.atv.tuwien.ac.at" The software (3
disks worth in 3 .ZIP files) is in the directory:
software_continuous_simulation/icap-4

A floppy disk containing all of the schematics and SPICE models in
the Intusoft Newsletter along with RF transistor models from NEC and
new op-amp models from National Semiconductor and Texas Instruments
is available.

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.