PROTEUS VSM help
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2011-08-15
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INTRODUCTION
ABOUT PROTEUS VSM
Traditionally, circuit simulation has been a non-interactive affair. In the early days, netlists were
prepared by hand, and output consisted of reams of numbers. If you were lucky, you got a
pseudo-graphical output plotted with asterisks to show the voltage and current waveforms.
More recently, schematic capture and on screen graphing have become the norm, but the
simulation process is still non-interactive - you draw the circuit, press go, and then study the
results in some kind of post processor. This is fine if the circuit you are testing is essentially
static in its behaviour e.g. an oscillator which sits there and oscillates nicely at 1Mhz. However, if
you are designing a burglar alarm, and want to find out what happens when a would-be burglar
keys the wrong PIN into the keypad, the setting up required becomes quite impractical and one
must resort to a physical prototype. This is a shame, as working ‘in cyberspace’ has so much to
offer in terms of design productivity.
Only in educational circles has an attempt been made to present circuit simulation like real life
electronics where it is possible to interact with the circuit whilst it is being simulated. The
problem here has been that the animated component models have been hard coded into the
program. Only limited numbers of simple devices such as switches, light bulbs, electric motors
etc. have been offered, and these are of little use to the professional user. In addition, the quality
of circuit simulation has often left much to be desired. For example, one major product of this
type has no timing information within its digital models.
PROTEUS VSM brings you the best of both worlds. It combines a superb mixed mode circuit
simulator based on the industry standard SPICE3F5 with animated component models. And it
provides an architecture in which additional animated models may be created by anyone,
including end users. Indeed, many types of animated model can be produced without resort to
coding. Consequently PROTEUS VSM allows professional engineers to run interactive
simulations of real designs, and to reap the rewards of this approach to circuit simulation.
And then, if that were not enough, we have created a range of simulator models for popular
micro-controllers and a set of animated models for related peripheral devices such as LED and
LCD displays, keypads, an RS232 terminal and more. Suddenly it is possible to simulate
complete micro-controller systems and thus to develop the software for them without access to a
physical prototype. In a world where time to market is becoming more and more important this is
a real advantage.
It is also worth pointing out that the processing power of the modern PC is truly awesome. A
300MHz Pentium II PC can simulate simple micro-controller designs in real time, or even faster
in some cases. And even where things slow down somewhat, the response time is more often
that not useable for software development. If you are serious about this game, you can go out
and buy a 2GHz dual processor PC, which is far, far faster. This, then, debunks the other obvious
objection to interactive simulation - that it would not be fast enough.
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