From the datasheet, max ratings:
Ib = 60pA
Ios = 30pA
Vos = 30mV
Although the solutions list the datasheet offset as the answer (30mV), it considers the bias current quickly to see how much of an effect it has, and I am confused by the method.
Essentially the calculation is Ios_(450k||50k) = Voff
Which is equal to 2.7uV (negligible)
I do not see how that circuit equation was obtained. It also says Ios+ is "absorbed" by Vin, which I don't understand either.
What I got was:
Vout/450k + Ios_ = 0, solving for Vout = -27uV
I treated the node between the 50k and 450k as virtual ground, thus rendering the 50k irrelevant, which I'm guessing is incorrect, but I don't know how to proceed. I simply did superposition, considering the effect of each non-ideality separately, thus turning the rest off.
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