Patent ID: 11902686
Assignee: SONY SEMICONDUCTOR SOLUTIONS CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A photodetection device comprising:
a first pixel that is configured to generate a first pixel signal;
a reference signal generator that is configured to generate a reference signal; and
a first converter that includes a first buffer circuit and a first comparison circuit and that is configured to convert the first pixel signal into a digital code, the first buffer circuit configured to output a first signal corresponding to the reference signal from an output terminal, and the first comparison circuit configured to perform a comparison operation on a basis of the first pixel signal and the first signal, wherein
the first pixel is configured to output the first pixel signal from an output terminal, and
the first comparison circuit includes
a first transistor having a gate, a drain, and a source,
a fifth transistor having a gate, a drain, and a source,
a current source coupled to the source of the first transistor and the source of the fifth transistor,
a first capacitor having a first terminal coupled to the output terminal of the first buffer circuit, and a second terminal coupled to the gate of the first transistor,
a second capacitor having a first terminal coupled to the output terminal of the first pixel, and a second terminal coupled to the gate of the fifth transistor,
a first switch that is configured to couple the gate of the first transistor and the drain of the first transistor to each other by being turned on,
a third switch that is configured to couple the gate of the fifth transistor and the drain of the fifth transistor to each other by being turned on, and
a load circuit coupled to the drain of the first transistor and the drain of the fifth transistor.