US 9,813,649 B2
Photoelectric conversion apparatus and photoelectric conversion system
Daisuke Yoshida, Ebina (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Mar. 28, 2016, as Appl. No. 15/82,937.
Claims priority of application No. 2015-070196 (JP), filed on Mar. 30, 2015.
Prior Publication US 2016/0295142 A1, Oct. 6, 2016
Int. Cl. H04N 5/374 (2011.01); H04N 5/378 (2011.01); H01L 27/146 (2006.01); H04N 5/359 (2011.01); H04N 5/3745 (2011.01)
CPC H04N 5/374 (2013.01) [H01L 27/14614 (2013.01); H01L 27/14643 (2013.01); H04N 5/359 (2013.01); H04N 5/378 (2013.01); H04N 5/37457 (2013.01)] 36 Claims
OG exemplary drawing
 
1. A photoelectric conversion apparatus comprising:
a photoelectric conversion element;
a differential pair including a first transistor configured to receive a signal based on an electric charge generated in the photoelectric conversion element and a second transistor configured to receive a reference signal;
a clamp circuit configured to clamp a voltage at a gate of the second transistor; and
an output circuit connected between a drain of the second transistor and an output node and configured to perform
a first operation to output a voltage based on a voltage at a gate of the first transistor to the gate of the second transistor, and
a second operation to receive a current from the second transistor, and to output a signal based on a result of a comparison between the voltage at the gate of the first transistor and a voltage at the gate of the second transistor to the output node,
wherein the output circuit includes a control unit including a current mirror circuit and a first switch element, and
the first operation and the second operation is switched in response to the state of the switch elements.