Re: Low pass filter with chopper stabilized opamp

From: Luhan Monat (x_at_y.z)
Date: 02/08/05 

Date: Tue, 08 Feb 2005 07:22:47 -0800

Mook Johnson wrote:
> 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?
>
>
>
>
>
Hi,

The ciruits for low pass filters using op-amps have very little drift or
offset due to massive amounts of negative feedback (i.e. the op-amp is
run at gain of 1 or 2. 

-- 
Luhan Monat (luhanis 'at' yahoo 'dot' com)
"The future is not what it used to be..."
http://members.cox.net/berniekm

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