US Patent No. 9,282,270

PHOTOELECTRIC CONVERSION DEVICE, IMAGING SYSTEM, AND METHOD FOR DRIVING PHOTOELECTRIC CONVERSION DEVICE


Patent No. 9,282,270
Issue Date March 08, 2016
Title Photoelectric Conversion Device, Imaging System, And Method For Driving Photoelectric Conversion Device
Inventorship Toshiaki Ono, Ebina (JP)
Kazumichi Morita, Kawasaki (JP)
Assignee CANON KABUSHIKI KAISHA, Tokyo (JP)

Claim of US Patent No. 9,282,270

1. A photoelectric conversion device comprising:
a cell array having a plurality of unit cells arranged in a matrix;
a plurality of clamping units each provided corresponding to a column of the cell array; and
a plurality of analog-to-digital (AD) conversion units each configured to convert a signal output from a corresponding clamping
unit to a digital signal,

each of the plurality of unit cells having:
a first photoelectric conversion unit;
a second photoelectric conversion unit; and
an intra-cell amplification unit configured to amplify signals generated by the first and second photoelectric conversion
units,

wherein each of the plurality of AD conversion units AD-converts a first analog signal based on a signal generated at the
first photoelectric conversion unit and output from the clamping unit,

and AD-converts a second analog signal output from the clamping unit by applying a signal based on the signals generated by
the first and second photoelectric conversion units to the clamping unit while the first analog signal is clamped at a reference
level.