I saw this on some EDN email/ spam.
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I don't know if it's been discussed here, but the e_n * Cin product is impressive.
George H.
LTC6268, FET, 4.5nV/rtHz, Cin~ 0.5 pF
Sep 24, 2015
1 Replies
I think that's been discussed somewhere.
They get the low Cin by bootstrapping everything. Heck, you can get zero or negative Cin by bootstrapping. But no free lunch: the input current noise is high, 5.5 fA/rthz. There are jfet opamps below 1.
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