Multi-mode ADC and its application to CMOS image sensors
US7518540B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 2007 |
| Grant date | Apr 14, 2009 |
| Priority date | — |
| Expiry date | Dec 7, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/709
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An analog-to-digital converter apparatus for analog source signals of one polarity, includes one comparator formed from transistors, a block of digitally addressable voltage sources to set a reference voltage of the comparator, an asynchronous n-bit digital counter, a block of digitally addressable voltage sources to set the potential to be applied to the signal source, a digital control unit, a block storing the calibration data for an input capacitor of the comparator, and a base-2 multiplier block, being interconnected by lines, including a line connecting the input analog signal to the drain of a pass transistor, a line connecting the block of voltage sources to be connected to the signal source, a line connecting the digital control unit to transistor gates, and a line carrying the signal Vref from the block of digitally addressed voltage sources to the comparator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.