Patent ID: 6215113
Filing Date: 2001-04-10
Classification: H01L,H04N

Abstract:
A CMOS active pixel image sensor cell comprising:a photo diode including a region of a N-type conductivity formed on a P-type substrate, the P-type substrate being adapted to connect to a first power supply VSS;a MOS transistor as a reset switch, a gate of the MOS transistor being adapted to connect to a reset control signal, a source thereof being adapted to connect to a second power supply VDD, and a drain thereof being connected to the N-type region of the photo diode;two MOS transistors as electronic shutter switches, each gate of said two MOS transistors being adapted to connect to a shutter control signal, and each drain thereof is connected to the N-type region of the photo diode;two source follower NMOS transistors, two gates of said two source follower NMOS transistors being connected separately to two sources of said two MOS transistors, and two drains of said two source follower NMOS transistors being adapted to connect to VDD; andtwo switch NMOS transistors as row select switches, two drains of said two switch NMOS transistors being connected separately to two sources of said two source follower NMOS transistors, both gates of said two switch NMOS transistors being adapted to connect to a row select signal, and each source of said two switch NMOS transistors being an output node.