I am trying to measure micro currents but the op amp seems to saturate right away or I’ve got something else going on - see attached schematic
I’ve created a current sense circuit using a 10 ohm current sense resistor and a ADA4528 precision op amp. The current I am measuring ranges from 0-30ua. Based on ohms law, a full scale reading would have .3mV across the 10 ohm shunt. Unfortunately I cannot use a higher resistance resistor due to it interfering in the circuit I am measuring. I have set the op amp to a 10k gain using 10k and 10 ohm resistors. Based on this a full-scale reading should give me 3v.
While operating the circuit the amp seems to saturate right away giving near rail voltage. Does the shunt have too low of impedance? Any ideas much appreciated.