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?

Harry

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?

Harry