US 12,316,989 B2
Driving method for AD conversion circuit, AD conversion circuit, photoelectric conversion device, and apparatus
Hideaki Takada, Kanagawa (JP); Hiroaki Kameyama, Kanagawa (JP); Masanori Ogura, Tokyo (JP); Makiko Saito, Tokyo (JP); and Takuya Hara, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Apr. 25, 2022, as Appl. No. 17/728,779.
Claims priority of application No. 2021-076754 (JP), filed on Apr. 28, 2021.
Prior Publication US 2022/0353448 A1, Nov. 3, 2022
Int. Cl. H04N 25/75 (2023.01); H04N 25/60 (2023.01); H04N 25/616 (2023.01); H04N 25/78 (2023.01); H04N 25/79 (2023.01)
CPC H04N 25/75 (2023.01) [H04N 25/60 (2023.01); H04N 25/616 (2023.01); H04N 25/78 (2023.01); H04N 25/79 (2023.01)] 25 Claims
OG exemplary drawing
 
1. A driving method for an analog-to-digital (AD) conversion circuit including a plurality of comparison circuits each including a first terminal to which a plurality of analog signals including a first analog signal and a second analog signal is input and a second terminal connected to a wiring through which a ramp signal is transmitted, the driving method comprising:
a first operation of changing an electric potential of the wiring from a predetermined electric potential to a first electric potential to cause at least one comparison circuit of the plurality of comparison circuits to retain a first offset;
a second operation of, after the first operation, converting the first analog signal into a digital signal using the ramp signal where a change start electric potential of the ramp signal is a second electric potential and a change end electric potential of the ramp signal is a third electric potential, and a range between the second electric potential and the third electric potential is a range which satisfies a condition where the range between the predetermined electric potential and the first electric potential is in the range between the second electric potential and the third electric potential;
a third operation of, after the second operation, changing the electric potential of the wiring to an electric potential included in a range of from the predetermined electric potential to the first electric potential; and
a fourth operation of, after the third operation, converting the second analog signal into a digital signal using the ramp signal where another change end electric potential of the ramp signal is a fourth electric potential which is a potential that satisfies a condition where the third electric potential is between the second electric potential and the fourth electric potential.