Subject: Re: SPICE?
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Date: Sat, 28 Sep 2002 15:01:37 GMT
NNTP-Posting-Date: Sat, 28 Sep 2002 17:01:37 MET DST
> > I just found out what Spice is at although I had a pretty good idea of
> > it is about:
> > http://bwrc.eecs.berkeley.edu/Classes/IcBook/SPICE/
> > I wonder if any of these simulation programs really work.
> Kevin Aylward
Kevin is right, I use SPICE since 1985 and it is the most useful program in
Before you had to breadboard everything with real parts, measure and then
only you would make a circuit board sticking adhesive tapes, eyelets etc. on
a big film sheet.
Now you just simulate with spice and then transfer the circuit to a layout
program. The whole process of breadboarding has disappeared and the amount
of time and money saved is impressing, with the same result of a working
In fact the parts have become so small, that it can be done only with the
Of course many things have to be simplified for simulation, and not every
real life phenomenon can be covered, but the program does a decent job, if
you know how to use it (and its limitations).
If this is true for analog design, digital circuits require even more the
use of simulators, but here usually Spice is not chosen, but some
specialized emulator program for that specific logic part.
With Spice there are even more possibilities than with breadboarding:
Monte-Carlo analysis varies the parameters of all the different parts in a
random manner within the stated tolerances and makes each time a simulation
writing a whole bunch of curves. so you can see if it is needed to buy parts
with tighter specs to satisfy the required accuracy.
Of course it is not possible to master this program in a few days, it
requires still the skills of an engineer, but you avoid a lot of small
errors we tend to make.