See below for schematics of the NIST isolation amplifiers from 1990
and 1997. NIST reported the isolation as >120dB.
I built isolation amplifiers similar to these (with lower-noise power
supplies and biasing tinkered slightly for better dynamic range), and
with careful construction achieved isolation substantially better
than 120dB (see my post of 11/25/14 for more details).
Best regards,
Charles
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