[sdiy] VCO unstable in Spice, stable in real world

[lanterma at ece.gatech.edu]

On Feb 2, 2011, at 4:36 PM, David G. Dixon wrote:

> I've just modeled a new VCO of my own design using LM311 as a hysteretic
> switch in a triangle core (I will actually use the LM319 dual comparator
> because I need two, but the spice model for that (LM119, actually) is
> totally out-to-lunch -- see below).  Sometimes the model comparator gets
> "stuck" on ground for no apparent reason, which I doubt would ever happen in
> real life.

Are you running two different oscillators with the same LM319? If so are you running into any accidental sync issues, with the behavior of one oscillator leaking into the other?

- Aaron