On Fri, 14 Oct 2016 22:25:55 -0500
David <davidwh...@gmail.com> wrote:

> I have done this and it works great; the breakpoint between the
> chopper amplifier and the low noise amplifier can be adjusted to
> combine the wideband noise from the low noise amplifier and the 1/f
> noise and drift of the chopper amplifier.
> Jim Williams wrote a couple of different application notes where this
> was used with both integrated and discrete amplifiers.

Yes, there are several appnotes and papers that list this method.
But I am not aware of any noise measurement below 0.1Hz for such
an amplifier setup.

                        Attila Kinali

It is upon moral qualities that a society is ultimately founded. All 
the prosperity and technological sophistication in the world is of no 
use without that foundation.
                 -- Miss Matheson, The Diamond Age, Neil Stephenson
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