Electronics > Beginners
Why is noise input-referred?
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David Hess:
As others pointed out, input referred noise is independent of gain.  The output referred noise is the input referred noise times the gain.

Some parts like instrumentation amplifiers may have both an input referred noise specification and a separate output referred noise specification.  The input referred noise is multiplied by the gain and then added to the output referred noise to get the total output noise.

These parts also have separate input offset and output offset specifications which work the same way.  At low gain, the output noise and output offset may dominate the total error.
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