US 12,283,926 B2
Comparator, photoelectric conversion device, and apparatus
Hideo Kobayashi, Tokyo (JP); and So Hasegawa, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Mar. 1, 2022, as Appl. No. 17/684,221.
Claims priority of application No. 2021-033250 (JP), filed on Mar. 3, 2021.
Prior Publication US 2022/0286100 A1, Sep. 8, 2022
Int. Cl. H03F 3/45 (2006.01); H03F 1/32 (2006.01); H04N 25/75 (2023.01)
CPC H03F 3/45188 (2013.01) [H03F 1/3211 (2013.01); H04N 25/75 (2023.01)] 21 Claims
OG exemplary drawing
 
1. A comparator comprising:
a first differential transistor and a second differential transistor forming a differential pair;
a first load transistor and a second load transistor respectively provided to the first differential transistor and the second differential transistor;
a first cascode transistor connected in cascode between the first differential transistor and the first load transistor; and
an amplitude limiting element configured to limit an amplitude of an output signal at an output node between the first load transistor and the first cascode transistor,
wherein the amplitude limiting element is an amplitude limiting transistor, and a gate and a drain of the amplitude limiting transistor are connected to the output node, and
wherein a gate of the first cascode transistor is connected to a source of the amplitude limiting transistor.