An imaging array having a CCD imaging array[10] that includes a plurality of pixels[15] that accumulate charge when exposed to light and a readout amplifier[30] is disclosed. The readout amplifier includes an operational amplifier[32] having an input and an output port and a feedback capacitor[33] connecting the input and output ports and a variable impedance path[35] between the input and output ports, the path having an impedance controlled by a reset signal. A reset signal generator[ 173] generates the reset signal in three sequential phases in which the path between the input and output ports has three impedance values to provide a starting voltage at the amplifier input prior to the measurement of charge from each pixel that has reduced noise.