To best
illustrate the usefulness of the monte-carlo
simulation, let’s use a voltage divider as example.

Run Transient simulation and get:

So this is
a perfect voltage divider. But we all knows that resistor has tolerance, let’s
say each of R1, R2 has 1% tolerance. We should factor this in by running Monte Carlo simulation and see what are we dealing with.

Enter 1% as
the resistor tolerance.

Tick “Enable
multi-step” to enable Monte-Carlo analysis

Set number
of runs to 100

Re-run the
transient simulation to see gain statistic of divider made of 2 pieces of 1% resistor.

With resistor tolerance of 1%, the voltage divider will give an error of ~-0.9% to ~+1%.
Use of Monte-Carlo simulation will ease such analysis. If your application cannot tolerate such variance, then resistors with better tolerance are needed.

Nice blog… Thanks for sharing very useful information about electrical circuits.

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