one/F noise source ckt?

[Harry Bissell]

Hi Magnus...

Bob Pease was referring to dielectric absorption, which models with caps separated
by very large resistances (so to speak).  The "pink noise" filter I've seen used
"stagger tuned" filter sections.  Works over a limited range....

H^) harry

Magnus Danielson wrote:

> From: patchell <patchell at silcom.com>
> Subject: Re: one/F noise source ckt?
> Date: Sun, 03 Sep 2000 13:41:43 -0700
>
> >     I found what you need in one of my Active Filter books.  To get a "true" -3db
> > per octave rolloff, you need to use a resistor with ditributed capacitance.  If
> > you were to model this with lumped components it would be equivilent to an
> > infinate number of resistors in series with an infinate number of shunt
> > capacitors.  The only draw back to this is I somehow don't think you are going to
> > find anybody selling such a component.
>
> Oh, yes... they are called capacitors ;D
>
> Good old big-bearded Bob Pease has written about capacitors and to model them
> correctly you need a distributed cap/resistor network. I do wounder however if
> they even approximate values which are suitable for the - 3 dB/Oct curve.
>
> However, it is true that it would require an infinitly long sequence to make
> a true filter. We could make approximations to within some limits and within
> some frequency span.
>
> Cheers,
> Magnus