Do you have any transimpedance amplifier that can amplify picoampere or lower current ?
Any op amp with low low input bias current, can have a resistor added to form a TIA.
If this is for a photodiode,, see the Wizard:
Photodiode Circuit Design Wizard | Analog Devices
If this is for one system at room temperature, you ccould use almost any CMOS op amp with TYPICAL
input bias current that is low; HOWEVER, not a guaranteed max. E.G. AD8603.
If you need guaranteed, see the ADA4530 data sheet, user guide, and app note. 80 pages.
What are you building?
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