A charge transfer device has an output structure formed, in a semiconductor substrate of a first conductivity type, of a base region of a second conductivity type, an output region of the first conductivity type formed in the base region, a reset-drain region of a second conductivity type formed separately...http://www.google.com/patents/US5191398?utm_source=gb-gplus-sharePatent US5191398 - Charge transfer device producing a noise-free output
