Oz-in-DFW wrote:

Chopping is used to cancel DC offsets in imperfect amplifiers, it adds
no gain. If there is a DC component and you filter with a cutoff
frequency below the chop rate, the offsets of the amplifier can be
effectively canceled.


Chopping isn't quite that magical.  You chop the DC signal before the
first amplifier, and synchronously (usually) detect the amplified signal
after the last amplifier.

The key benefit to chopped amplifiers is the high gain stages can be
AC coupled, which eliminates any DC drifting in the high gain amplifiers
from affecting the results.

Chopping doesn't cancel any DC offsets that might exist in the input signal,
or in the input, or output, chopper mechanism.

-Chuck Harris

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