A passive readout circuit for reading out a charge stored on an integration capacitor coupled to a photodiode includes a column bus selectively connectable to the integration capacitor, at least one shield line arranged near the column bus such that a first parasitic capacitance is created between the at least one shield line and the column bus and an amplifier having a first input, a second input and an output. The column is connected to the first input and the at least one shield line is connected to the output of the amplifier.