1.2 V 0.18 µm CMOS imager with column-level oversampling

A CMOS imager designed and fabricated in a 0.18 µm digital CMOS technology operating from a 1.2 V power supply is reported. The imager uses second-order oversampled delta-sigma modulator analog to digital conversion at the column level to achieve high dynamic range for this low supply voltage. In experimental tests the imager was shown capable of measuring input light levels ranging over 5 orders of magnitude.