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Low Noise Opamp Choice

February 1, 2017

The following apps notes give some guidance on opamp choice for low noise. 

Basically if equivalent input resistance is low, voltage noise dominates. If input resistance is high, current noise dominates, and if it’s in the middle the resistor noise dominates.

Optimum input resistance for low noise is in the range of opamp Vnoise/Inoise.

http://cds.linear.com/docs/en/design-note/dn355f.pdf

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