Auto zero amplifiers,like opa2188 ,have spike bias current which is very huge.The datasheet of AD8628 did not mention spike bias current,does AD8628 have very low spike bias current or it does not have any spike bias current?
We haven't measured the AD8628 bias current's spike but I can say that there could be spike in bias current based on the internal structure of zero- drift amplifiers. It could be small or huge but I cannot say the exact amplitude unless tested. Why do you have to use zero drift amplifiers? is it possible to share your application. We also have ADA4522-1 that you can consider in your application. It has better noise performance and wide operating range.
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