IMAGE SENSOR PIXEL HAVING PHOTODIODE WITH COUPLING CAPACITOR AND METHOD FOR SENSING A SIGNAL

摘要

A photodiode with a floating layer and coupling capacitor, and an image sensor pixel using it. The photodiode comprises an epitaxial layer having a first conductive type; a first diffusion region having a second conductive type formed in the epitaxial layer; a second diffusion region having a first conductive type formed over the first diffusion region; and a coupling capacitor configured to transmit outside a voltage change of the first diffusion region. The active pixel comprises the photodiode described above, a reset switch, a multi-functional switch between a variable voltage source and an output terminal of the coupling capacitor, and a signal amplifier.