ADA4941-1: DIS Pin and noise calculation

Document created by analog-archivist Employee on Feb 23, 2016Last modified by analog-archivist Employee on Feb 23, 2016
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In 17th page of ADA4941-1's datasheet, it gives how to calculate the noise,
like below figure shown. I am not sure why there is a factor "2" and "4", as
below red circle indicate:

 

The 2 comes from the difference at the Vop and Von. The Vop is (RF/RG+1) while
the Von is –(RF/RG+1), the difference of the two is 2(RF/RG+1).The 4 comes from
squaring the term, where the noise gain is 2 = (RF/RG+1).

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