6/1/16:Input vs output noise analysis

Question

Since we can measure Noise referred to input and noise referred at output, wouldn't the noise referred to the output be equal to noise referred at input at unity gain feedback ? (multiplied or divided by gain based on feedback) ?

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[edited by: lallison at 4:02 PM (GMT -4) on 6 Jun 2022]

ScottH · Accepted Answer

You're right. The RTI noise and the RTO noise are equal for an op amp when you have a voltage follower (unity gain feedback). Otherwise you use the noise gain (1/beta) to translate between RTI and RTO.)

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6/1/16:Input vs output noise analysis