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Design Sallen-Key low-pass filters with G above 1, achieve lower output noise

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One of the most challenging aspects in optimizing the performance of a successive-approximation-register analog-to-digital converter (SAR ADC) is the design of the anti-aliasing filter (AAF).
A Franken-system is a collection of development boards, wired together to create a very non-form-factor early prototype.
In the design of analog front ends that require low noise, it is important to consider all aspects of the design.
You should be pretty warmed up for "Ask The Experts" by now. Hereís the last of those three conundra. Itís the one that usually provokes the greatest debate.
Whatís getting in the way? Are you trying to filter something out, or filter something in?
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