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JFET Buffer Design Issues

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madwolfe:

--- Quote from: Kleinstein on November 19, 2019, 04:07:36 pm ---PH sensors don't need ultimate precision, but a really low bias helps. So the low bias CMOS versions are preferred . They are usually also avialable as duals (e.g. LMC6082).

A virtual ground like some 1 V from ground can be a good idea. However no need to get an accurate value, especially if the ADC has a differential input or one can measure both side.

--- End quote ---
Ooo yeah, I like the look of the LMC6082, that 10fA bias and offset current is pretty great. Thanks for that.

Finding the ideal component is one of the hardest parts of design I find.

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