6/1/16: output section noise of an opamp

Question

Do you need to think about the output section noise of an opamp. Why is there no mention of that on the datasheet?

ScottH · Accepted Answer

It's all included in the voltage noise specification. During design, you take all of the noise sources within the op amp, refer them to the input, and that's your voltage noise. It technically includes the noise of the output stage, but generally there's so much gain taken in the op amp up to that point that, when you refer it to the input, it doesn't contribute anything.)