NEW VERSION OF INDUSTRY STANDARD FOR CIRCUIT SIMULATION

MICROSIM CORPORATION ANNOUNCES MICROSIM PSPICE VERSION 6.2

March 13, 1995 -- IRVINE, Calif. -- MicroSim Corporation today introduced
MicroSim PSpice Version 6.2, a feature-rich enhancement of the electronic
design automation industry's standard for circuit simulation; MicroSim
PSpice A/D Version 6.2, one of the only accurate. true native mixed signal
simulators on the market today, and MicroSim PLogic Version 6.2 for
digital simulation.

The new MicroSim simulator products were developed for designers of both
discrete systems and integrated circuits, whether using a UNIX-based
workstation from companies like Sun Microsystems or Hewlett Packard, or a
Windows-based personal computer.

"The new versions of MicroSim PSpice brings important enhancements to the
component manufacturers who currently use MicroSim PSpice for IC design
work," said Wolfram Blume, MicroSim's president,

A new BSIM3 model, Berkeley Version 2.0, has been added to MicroSim PSpice
for MOSFETs. The new MicroSim BSIM3 and BSIM3 Version 2.0 models are as
accurate as proprietary models, even for short channel lengths, over a
wide range of bias and device dimensions. With the new model, IC designers
reduce the common risks of being locked into proprietary models.

MicroSim PSpice Version 6,2 works with leading parameter extraction
products including Technology Modeling Associate's AURORA, Hewlett
Packard's IC-CAP and BSIMPro from Berkeley Technology Associates.

The software has substantially improved accuracy and convergence
characteristics when compared to Berkeley SPICE, Design iterations are
turned around faster than other packages on the market due to the new
software's ability to handle large designs easily. Rather than waiting for
outside vendors to make model adjustments. users have the option to do it
themselves with MicroSim Device Equations. MicroSim PSpice Version 6.2 is
fully integrated into Cadence and Mentor Frameworks supporting all
MicroSim PSpice features including digital simulation. analysis, and
cross-probing.

The new version of MicroSim PSpice' includes, at no additional cost. over
32.000 component symbols and 10,000 simulation models, thousands more than
competitors. Over 120 new device models have been added, for
instrumentation amplifiers, voltage references, wideband buffers, a
current-feedback amplifier, a four-quadrant analog multiplier, and many
other operational amplifiers. The Parker-Skellern MESFET model for
GaAsFETS has been added giving PSpice four levels of models available for
GaAsFETS, developed at Macquarie University in Sydney, Australia, the new
model provides improved accuracy when modeling GaAs MESFETS in
large-signal RF applications. In addition, new bipolar transistor model
enhancements improve simulation accuracy.

For discrete designers, MicroSim PSpice Version 6.2 can verify operational
correctness before board layout or after board layout with the board
parasitics, using MicroSim Polaris, the only signal integrity package
available for Windows. To correct for signal degradation due to board
parasitics after board layout, MicroSim Polaris fully analyzes crosstalk,
reflection, and delay effects. Using layout geometries and additional
board stack data. MicroSim Polaris calculates transmission line.
capacitance, and trace coupling parasitics.

In addition to the standard SPICE 2G6 and SPICE 3 capabilities, MicroSim
PSpice Version 6.2 also supports lossy transmission lines (distributed
model), transformers and power inductors, non-linear magnetic core model
(enhanced Jiles-Atherton model) for use in power supply designers, and
independent device temperatures for passive and semiconductor devices.

MicroSim is the only company with native mixed analog/digital simulation
for PCs. The product is significantly faster and more accurate than all
competitors using generic macro models of digital parts. Extensive
libraries include both typical and worse-case timing.

"MicroSim's graphical waveform analyzer, Probe, provides ten times the
analysis information and ten times the value for users." says Wolfram
Blume. For example, the product can evaluate waveforms to extract percent
overshoot and then plots the change in overshoot versus component value.
The design insight behind MicroSim Probe yields fewer design iterations.
shorter design cycles. and significantly better quality."

The new release adds toolbars to the Windows and Motif products, providing
shortcuts for invoking the most common waveform analysis functions.

New on-line manuals provide fast information retrieval using keyword search
and hypertext links. The new on-line manual viewing software (FrameViewer)
includes fast search capabilities and hypertext links set up for the Table
of Contents, Index, List of Tables, or List of Figures. Users can
instantly move to the page of choice by clicking on the page number in any
one of these references. The software also supports keyword searches for
users to locate information on any subject by simply typing in the text to
be matched. MicroSim packages shipped on CD-ROM for Windows and Sun
platforms include on-line manuals.

MicroSim PSpice was the first to provide analog behavioral modeling using
simple-to-learn and easy-to-use extensions to MicroSim PSpice device
modeling. Designers can write behavioral models using equations, tables of
values, and if-then-else structures. Now MicroSim PSpice Version 6.2
allows designers to also use differential and integral equations in their
analog behavioral models. Designers can write the differential equations
directly in their models, or they can draw a schematic with behavioral
blocks. This makes it even easier to create behavioral models of
mechanical or chemical systems which relate speed. acceleration. and
position.

MicroSim PSpice Optimizer, Version 6.2, improves analog and mixed signal
design performance while providing complete control over goals and
constraints. Customers get higher yields and better design performance
(more speed, less power, less distortion, higher bandwidth. etc.) by using
MicroSim PSpice Optimizer. The optimizer simulates circuit designs with
MicroSim PSpice or MicroSim PSpice A/D for Windows and Sun platforms,
adjusting design parameter values for the best solution to meet target
performance specifications. It is the only analog optimizer in the
industry that can handle design problems with nonlinear constraints.

MicroSim PSpice and MicroSim PSpice AID Version 6.2 pricing ranges from $
1,495 to $ 11,900 ($1,950 to $15,500 internationally). MicroSim Polaris,
the only signal integrity package available for Windows, is priced at
$4,900 ($6,350 International) compared to competitor UNIX-workstation
pricing of $21,000.

MicroSim offers a family of powerful, integrated products for schematic
capture (MicroSim Schematics for Windows), signal integrity analysis
(MicroSim Polaris), mixed analog and digital simulation (MicroSim PSpice
or MicroSim PSpice A/D), PLD synthesis (MicroSim PLSyn), logic simulation
(MicroSim PLogic), analog performance optimization (MicroSim PSpice
Optimizer), and printed circuit board (PCB) design (MicroSim PCBoards and
MicroSim PCBoards with Autorouter for Windows). MicroSim products are
available for Microsoft Windows. Windows NT, DOS, Sun and HP.

The company introduced its flagship product, MicroSim PSpice, in 1984 as
the first SPICE-based program available for IBM-PC compatibles. MicroSim
PSpice significantly expands the capabilities of the SPICE program
developed at the University of California, Berkeley. The product is so
widely used with over 22,000 customers that many corporations and
universities refer to MicroSim PSpice in place of the generic SPIC
(Simulation Program With Integrated Circuit Emphasis).

MicroSim sells directly to users and through VARs (value added resellers).
"Because we do not have an expensive sales force, we can pass our savings
on to our customers," said Blume. "MicroSim users receive sophisticated
software comparable to that of larger companies, but at much more
affordable prices."

MicroSim Application Engineers provide same-day response technical support
free to customers. More information on MicroSim products is available by
phone at (714) 770-3022 and (800) 245-3022, or via fax at (714) 455-0554,
or on Internet as Sales@MicroSim.com.

MicroSim Corp
20 Fairbanks
Irvine, CA 92718
714-770-3022,  fax 714-455-0554,  BBS 714-830-1550
Internet: Sales@MicroSim.com

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