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Subject: Re: Opamp temperature compensation (variometer)

Date: 06/15/01 at 11:53 AM
Posted by: John Dunn - Consultant
E-mail: ambertec@ieee.org
Message Posted:

In Reply to: Opamp temperature compensation (variometer) posted by Cosmin Buhu on 06/14/01 at 6:56 AM:

Hello, Cosmin.

You simply cannot guarantee temperature compensation under the circumstance you describe, but you might have a chance to get out of trouble, for the time being at least, if luck is on your side.

If the forth op-amp of the quad device happens to have its own offset drift in the same magnitude and direction as the other three, you could hook that fourth device up as a voltage follower with respect to ground and use its output to feed your active circuit in whatever phasing would cancel, or at least partially balance, the total offset.

This is a dicey answer at best, absolutely NOT a long term solution and it might not even work if the four op-amp sections don't match each other well enough, but you have nothing (I hope) to lose by trying.

Good luck.

John Dunn - President
Ambertec, Inc.
ambertec@ieee.org


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