[sdiy] Re: Leapfrog

[Don Tillman]

Hi JH.

Well... you fooled me, too.  I had not seen the NIC positive
integrator circuit before.  So when I looked at the first stage and I
immediately thought you had accidently built a lossy integrator and
forgotten the input resistor.  

But sure enough, the first stage is just an optimization, and the
other 'L' stages all really are NIC positive integrators (with R183,
R187, etc.).

Very clever!

Although I would be concerned about low frequency noise performance
with so many of these in series.

  -- Don

-- 
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com