Offset injection in an analog-to-digital converter
US9148603B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 2013 |
| Grant date | Sep 29, 2015 |
| Priority date | — |
| Expiry date | Oct 31, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/466
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electronic device may have one or more analog-to-digital converters (ADCs). The ADCs may be used in digitizing signals from an image sensor. In order to ensure that input signals received by an ADC are not clipped, the input signals may be positively or negatively offset by a desired amount. Offsetting the input signals may ensure that the offset input signals wall within the acceptable input range of the ADCs. Offset injection may be accomplished using capacitors that are also used for analog-to-digital conversion. As an example, the ADC may be a successive approximation-type ADC that uses capacitors in a binary search for the digital value most accurately representing an input analog value. The capacitors of the ADC may be used for the successive approximation process and for offset injection. The offset injection may be digitally canceled out following digitization of the input analog signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.