1/f noise (was: RE: super cables)

[KA4HJH]

>I've read in some book that the DC offset voltage drift of opamps can be
>considered the naturaral extension of 1/f noise. If memory serves, the
>intention of this article was to point out the non-deterministic way of DC
>offset, and that you cannot really *measure it*, because DC means infinite
>time, and that we normally speak of "DC" when we're actually dealing with
>step functions in the minutes, hours or days range, in practical life.
>I have *no* idea if DC offset voltage drift has actually the same underlying
>mechanism as 1/f noise or not, but I admit I like the holistic approach to
>this problem.

1/f should be a "random walk", and if that's whats happening you can
imagine why there would be problems with measurement.

>Anybody knows for sure ?

Take it from me... Yeah, right. ;)
Any fractal experts?

>PS.: Don't tell me that at DC noise would become infinite. This means
>nothing
>more or less than *after infinite time* there is maximum entropy in the
>world (;->).

OK, I won't tell you (it's easy because I don't know).



Terry Bowman, KA4HJH
"The Mac Doctor"