Re: gEDA-user: Spice noise analysis

["Harold D. Skank" <skank54@xxxxxxxxx>]

Thanks!  If I integrate over 1 cycle, then take the square root, I get
about 0.36 microvolts, which is just about the product of the gain and
the input voltage noise.  Makes a lot more sense.

	Harold Skank

On Sun, 2005-08-07 at 18:16 -0400, John Doty wrote:
> As I said, the output is in units of V^2/Hz. It's not in volts, despite
> what SPICE claims. If you want volts, you have to integrate over some
> passband and take the square root.
> 
> John Doty          "You can't confuse me, that's my job."
> MIT-related mail:                       jpd@xxxxxxxxxxxxx
> Other mail:                             jpd@xxxxxxxxxxxxx
> 
> On Sun, 7 Aug 2005, Harold D. Skank wrote:
> 
> > Thank you for your advice.  I did get your procedure to work, though I'm
> > somewhat in doubt as to how to interpret the results.  Basically the
> > onoise_spectrum had about the shape I expected, but the flat central
> > region was about 130 femptoVolts whereas the data sheet listed something
> > like 2 to 3 nanovolts noise (at the input).  What about this?
> > 
> > 	Harold Skank
> >