A/D converter, solid-state image sensor using plurality of A/D converters and driving method of A/D converter for correcting an offset value of the A/D converter based on a held offset value
US8698062B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 24, 2011 |
| Grant date | Apr 15, 2014 |
| Priority date | — |
| Expiry date | Feb 15, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/56
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An analog-to-digital converter converts an analog signal into a digital signal by measuring a time period until a magnitude relation between a voltage level of a reference signal that changes along with time and a voltage level of the analog signal is inverted. The converter comprises a holding unit which holds, as a voltage level that is an analog value, an offset value of the analog-to-digital converter upon analog-to-digital converting a reference voltage level by the analog-to-digital converter, wherein the offset value of the analog-to-digital converter is corrected by changing the voltage level of the analog signal by the voltage level of the offset value held by the holding unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.