Low pass filter with chopper stabilized opamp

From: Mook Johnson (mook_at_mook.net)
Date: 02/08/05 

Date: Tue, 08 Feb 2005 03:13:54 GMT

I'm looking for a anti-alias filter for my sub-hertz filter discussed
previously. (thanks for the responses)

For this I need at least 2nd order to prevent aliasing down to the
frequencies of interest to me. Looks like I wont be able to avoid an OP-amp
in the signal chain so I'm looking for one with as little DC drift as
possible.

Chopper stabilized (like the linear tech "zero drift") appear to to be some
of the betterones for low drift with temeprature. With the current
non-chopper precision Analog Devices amps there is considerable drift with
temperature.

My question is if there are any special considerations for a chopper
amplifier when configuring it as a low pass filter?

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