An embodiment is directed to an instrumentation amplifier. The
instrumentation amplifier includes an output stage for generating an
output voltage, a low-frequency path coupled with the output stage, and a
high-frequency path coupled with the output stage. The high-frequency
path dominates the low-frequency path at frequencies above a particular
frequency, and the low-frequency path dominates the high-frequency path
at frequencies below the particular frequency. The low-frequency path
includes an input stage for sensing a differential input and generating
an intermediate current based thereon, a feedback stage coupled with the
input and output stages, the feedback stage for generating a feedback
current based on the output voltage, and an auto-zeroing circuit coupled
with the input, feedback, and output stages, the auto-zeroing circuit for
generating a nulling current. The nulling current compensates for errors
in the intermediate and feedback currents resulting from input offsets in
the input and feedback stages.