Op-Amp input offset voltage vs. time

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Kingcosmos - 30 Jun 2007 02:20 GMT

I have a simple, but curious question about an op-amp specification:
input offset voltage vs. time. I see this specified as uV/mo. Is
this caused by general aging of the part; i.e., regardless of being
powered on or stored on a shelf?
Also, is it assinine to assume that the offset will drift in one
direction +/- 1.5 uV/mo (OP07 from ADI for example) from the day 1
(whatever that day is) until eternity?

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John Popelish - 30 Jun 2007 05:27 GMT

> I have a simple, but curious question about an op-amp specification:
> input offset voltage vs. time. I see this specified as uV/mo. Is
> this caused by general aging of the part; i.e., regardless of being
> powered on or stored on a shelf?

It can wonder in either case, but you won't know what it is
doing till you power it up.

> Also, is it assinine to assume that the offset will drift in one
> direction +/- 1.5 uV/mo (OP07 from ADI for example) from the day 1
> (whatever that day is) until eternity?

It is not safe to assume that it will steadily drift in one
direction. It will do a random walk. There is also a warm
up drift that is usually worse. This spec assumes operating
at a constant temperature.

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Electronics Forum / Basics / June 2007

Op-Amp input offset voltage vs. time