Spice Sim / phase reversal ?

[Magnus Danielson]

From: Harry Bissell <harrybissell at prodigy.net>
Subject: Spice Sim / phase reversal ?
Date: Wed, 26 Jul 2000 23:51:27 -0400

> Hi y'all

Harry,

> I was playing with a spice simulation of a glide circuit, with a switch
> for exp/lin
> response.  While flipping the toggle between mode, the output reversed
> and ran for the
> rail, just like the dreaded "phase reversal".  It is likely that the
> common mode voltage
> could have been exceeded in the simulation...
> 
> So.... Q?
> 
> Has anyone ever seen phase reversal in a spice macromodel. This one was
> an NJM072
> model.
> 
> Was this real, or just a math sampling error ???
> 
> opinions wanted !!!

Um, would you mind sharing the spice file with us so we may look at it, fool
around with it and get to play too?

I know that I would like to do that at least....

Also, there are zillion ways of messing things up in a Spice simulation, but
you know that, right? ;)

Cheers,
Magnus