A 580 × 500-element CCD imager with a shallow flat P well

This paper will discuss an interline-transfer CCD imager employing a shallow flat P-well that incorporates CCD shift registers, as well as photodiodes. Aperture ratio is 32% and a smear level of -70db has been obtained. In the unit cell, an N type substrate acts as an overflow drain for blooming suppression, while a single flat P-well is employed in the imaging area.