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Low-Noise Front End Protection

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splin:

--- Quote from: Evan.Cornell on February 14, 2020, 08:03:20 pm ---I understand that, and the energy profile of piezo pulse is undefined, so I want to operate on the safer side. I am thinking series R = 10ohm or thereabouts with BAV199 to each rail, and another series R ~10ohm before AD8655 input.

--- End quote ---

https://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0350.pdf

It shows a 1K series input resistor for protection. It's only a reference design and not guaranteed to be a robust, production ready design of course. 1K has approx 4nV/sqrt(Hz) which is similar to the opamp's noise, but noise and bandwidth limitations allowing, somewhat higher resistance could be used.

[EDIT] Of course the circuit note author may save assumed a securely mounted sensor not susceptible to hard knocks.

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