ADA4530-1Recommended for New Designs
The ADA4530-1 is a femtoampere (10-15 A) level input bias current operational amplifier suitable for use as an electrometer that also includes an integrated...
Datasheet ADA4530-1 on Analog.com
Measuring currents down to the femtoampere range is no simple task. Circuit NoteCN-0407shows howADA4530-1, along with proper guarding, shielding and component selection can be used to make this measurement.