Re: Oscillators in LTspice

On 19/10/2024 3:33 am, Cursitor Doom wrote:

Gentlemen,
 I've never spiced an oscillator AFAICR. Do they self-start in spice
simulators (LT in particular)? IOW, did Mike Engleheart build something
into the engine which generates wideband 'background' noise, particularly
at 'power up' as it were? I'm assuming there must be some such mechanism
and if there is, it must be present by default for all schematics one
attempts to simulate and not just oscillators?

They don't usually self-start. Rounding errors in the arithmetic do act as a source of wide-band noise, but for any practical simulation you set up the initial conditions to launch the oscillation at an appreciable fraction of the steady state amplitude.
--
Bill Sloman, Sydhey