A/D converter including comparison circuit and image sensor including same
US11627276B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 2021 |
| Grant date | Apr 11, 2023 |
| Priority date | — |
| Expiry date | Sep 9, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/78
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An A/D converter and an image sensor are disclosed. The image sensor includes: a pixel array including a plurality of pixels; a ramp signal generator configured to generate a ramp signal; and a comparison circuit configured to output a comparison result signal by comparing a pixel signal output by the pixel array with the ramp signal. The comparison circuit includes: a first comparator stage configured to output a first stage output signal according to a result of comparing the pixel signal with the ramp signal, to a first circuit node; a limiter including an n-type transistor having one end connected to the first circuit node and an opposite end to which power supply voltage is applied; and a second comparator stage configured to generate the comparison result signal by shaping the first stage output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.