Television – Camera – system and detail – Solid-state image sensor
Reexamination Certificate
2008-01-08
2008-01-08
Vu, Ngoc-Yen (Department: 2622)
Television
Camera, system and detail
Solid-state image sensor
C348S241000
Reexamination Certificate
active
07317484
ABSTRACT:
A circuit and method for reducing noise in video imagers which takes advantage of the fact that the same image information is present in the drain current in a reset transistor used to reset a photodiode in a pixel as is present in the readout current. The noise is reduced by passing the multiplexed output voltage from the source follower output transistor in an APS imager system through a high pass filter to reduce the low frequency noise from the source follower. The drain current in the reset transistor used to reset the APS is passed through a low pass filter. The low pass filter output and the high pass filter output are then combined. Since the drain current in the reset transistor contains the same image information as the voltage output of the source follower output transistor the image information can be obtained by combining the output of the low pass filter and the output of the high pass filter. Since the low frequency noise components of the source follower output transistor have been suppressed combined outputs of the low pass filter and high pass filter will provide the image information with greatly suppressed low frequency noise.
REFERENCES:
patent: 4435730 (1984-03-01), Bendell et al.
patent: 4677490 (1987-06-01), Levine
patent: 4764814 (1988-08-01), Endo et al.
patent: 4831451 (1989-05-01), Hynecek
patent: 6067113 (2000-05-01), Hurwitz et al.
patent: 6339363 (2002-01-01), Fowler
patent: 6469740 (2002-10-01), Kuroda et al.
patent: 6777660 (2004-08-01), Lee
patent: 6781627 (2004-08-01), Takayanagi
patent: 6803958 (2004-10-01), Wang
patent: 2001/0033337 (2001-10-01), Sakuragi
patent: 2004/0080646 (2004-04-01), Zhao et al.
patent: 1253781 (2002-10-01), None
Stanley G. Burns and Paul R. Bond, Principles of Electronic Circuits, 1987, West Publishing Company, 603-604.
DeGeronimo et al.,“Front-end Electronics for Imaging Detectors,” Nuclear Instruments & Methods in Physics Research, Section-A: Accelarators, Spectrometers, Detectors and Associated Equipment, North-Holland Publishing Co., Amsterdam, NL, vol. 471, No. 1-2, Sep. 21, 2001, pp. 192-199.
Kempainen: “CMOS Image Sensors: Eclipsin CCDS in Visual Information?,” EDN Electrical Design News, Cahners Publishing Co., Newton, Mass. U.S., Oct. 9, 1997, pp. 101-102, 105-106.
Dosluoglu Taner
Levine Peter Alan
Ackerman Stephen B.
Digital Imaging Systems GmbH
Peterson Christopher K
Prescott Larry J.
Saile Ackerman LLC
LandOfFree
CMOS APS readout scheme that combines reset drain current... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with CMOS APS readout scheme that combines reset drain current..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and CMOS APS readout scheme that combines reset drain current... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2777265