RobG
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Stated differently, noise does not double with a differential structure; it increases by sqrt(2). This is because the noise on each side is uncorrelated. On the other hand, the signal can be twice as large if it is differential.
So, with differential: 1) Noise goes up by sqrt(2) 2) Signal goes up by 2 Therefore, signal-to-noise increases sqrt(2) (equal to 3dB).
However, depending on what you are trying to do, differential may take twice the power so the noise advantage is lost. You still get cancellation of even ordered harmonics which is a good thing.
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