Dear Sirs
My customer use OPA552 as a modified Howland current pump. (like the following two figure)
They give the input voltage (+Vin) and get Iout.
But the linearity is bad near 0uA. (+Vin is near 0~0.1V)
input voltage 0.3V=>Iout 28uA,
input voltage 0.2V=>Iout 18uA,
input voltage 0.1V=>Iout 6uA,no good,
How could them improve near input voltage 0.1V? Thanks
BRS
Nat