How to simulate a uniform distribution around zero in LTSpice?

Question

I am using LTSpice for a Monte-Carlo simulation, I typically use the function {mc(x,y)} for componant variability

I also want to introduce spread in the feedback pin voltage of a DCDC converter by adding a series voltage source:

This obviously does not work as it is multiplying zero with a tolerance.

How would you induce a uniform distribution around zero?

Not sure how you could get much more elegant than two extra characters. You might want to be DRY and replace the 1's with a parameter! — Neil_UK, Commented Jul 4 at 16:25
Agreed. Your solution is very elegant. I would edit the solution out and post it as the answer. It’s a worthwhile question to have an accepted answer for. — Ste Kulov, Commented Jul 5 at 20:31

Rémi Baudoux · Accepted Answer · 2024-07-06 22:36:14Z

1

This works, the tolerance is directly in Volts (flat distribution of +/- 10 mV in that case)

(For the copy-paste: {mc(1,tol)-1} 😉)

answered Jul 6 at 22:36

Rémi Baudoux

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