Phil Allison wrote:


** Jim only asked for a gain equation - then ignored it when it was posted
by me.



Your equation was wrong and the entire article is mere mindless dictate.
There is no explanation of circuit operation because there is no
understanding of it. The operating characteristics of the gain elements
are only nominally regulated and the THD is bad. I don't believe the
equivalent en of 2nV per root-hz or the CMRR of 60dB for one second,
those figures are extremely improbable. Then the comparison to the
SSM2017 performance and architecture is the penultimate
misrepresentation, the circuit concepts are completely different, and
your kluge just isn't the same leagues. You would have been better off
using a TL074.