Literature: 		Spice Newsletter
Description: 		Technical publication describing applications of the SPICE circuit simulation program
Price:	 			FREE
Featured Topics:	Code Model Software Development Kit, Simulating a State Machine
Other Topics:		Pentium Bug & SPICE, NTSC Signal Source
Contact:			Charles Hymowitz - Vice President intusoft   (310) 833-0710, Fax (310) 833-9658
					E-mail 74774.2023@compuserve.com


FREE SPICE Newsletter Discusses Pentium Bug and State Machines

	The Intusoft Newsletter  is a unique FREE publication dedicated to discussing topics related to the SPICE circuit simulation program.  The January 1995 issue contains several application notes designed to help engineers simulate circuits more effectively.

		The first article introduces Intusoft's new Code Model Software Development Kit or CM-SDK.  The CM-SDK allows the user to develop Analog Hardware Description Language (AHDL) models consisting of C code.  This "C Code Modeling" architecture is based on the XSPICE program originally developed by the Georgia Tech Research Corporation, a unit of the Georgia Institute of Technology in Atlanta, GA.  The Intusoft AHDL differs from current HDL offerings which are proprietary.  An AHDL allows the user to easily develop just about any model or interface other functions to SPICE.  The models may be as simple as a transfer function or as complex as a new MOSFET.

	The second article discusses the simulation of a State Machine.  The state machine provides for straight forward descriptions of logic blocks with a variable number of inputs and outputs and an unlimited number of states.  The model 

can be configured to behave as virtually any type of counter or clocked combinational logic.  It can replace very large sections of digital circuits with a functionality identical but faster representation and alleviate the tedious schematic entry of complex design.

	Intusoft has investigated the Pentium division bug to see if it has any effect on SPICE. Several circuits were run on 486 and Pentium machines.  These circuits included a switched current integrator, an analog correlator, a high-Q VCXO and a CHAOS simulation using Chua's circuit.  This article discusses the results.

	The Intusoft Modeling Corner, a regular column in the newsletter, reports on one of the most complex stimulus sources developed to date; a National Television System Committee (NTSC) signal generator.  The NTSC subcircuit is discussed in the newsletter and simulation results 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

	The Intusoft Newsletter is the only regularly scheduled publication dedicated to SPICE modeling and analog circuit simulation. An electronic version (Replica document) of the Intusoft Newsletter is posted on Compuserve (CADD/CAM/CAE Vendor Forum).The peak newsletter circulation is currently at 34,000 readers in over 110 countries.