How to Reduce Reference Noise by Half
This application note describes a low-noise, 2.5V reference constructed by stacking four 2.5V reference ICs in series. The resulting 10V output is divided back to 2.5V, and a low-noise unity-gain buffer added.
This stacked-reference design reduces noise because the noise from each IC, being random and uncorrelated, partially cancel each other out.
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