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Q&A Input offset voltage/bias current noise contribution in operational amplifiers

While input offset voltage is technically noise in the sense that it is something unwanted added to the signal, it is not included in opamp noise specs as far as I have seen. Think of the "noise" ...

posted 3y ago by Olin Lathrop‭

Answer
#1: Initial revision by user avatar Olin Lathrop‭ · 2021-07-22T16:51:31Z (over 3 years ago) 
While input offset voltage is technically noise in the sense that it is something unwanted added to the signal, it is not included in opamp noise specs as far as I have seen.

Think of the "noise" spec as the AC part of the noise, with the offset voltage and current telling you about the DC part of the noise.  Note that  "noise" is usually given as a function of the overall bandwidth used, like nanovolts per sqrt(Hz).  Since this indicates 0 noise at 0 Hz (DC), it makes it clear that DC errors are specified separately.