Analog to digital converter
US8542144B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 2011 |
| Grant date | Sep 24, 2013 |
| Priority date | — |
| Expiry date | Dec 3, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/765
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An analog to digital converter converts an input analog signal to a digital representation using successive approximation logic to generate a plurality of digital values approximating the analog signal. Evaluation logic evaluates each of the digital values by converting each of the digital values in a digital to analog converter (DAC) to a DAC analog signal and comparing the DAC analog signal to the input analog signal to determine a comparison result used by the successive approximation logic to generate a next one of the digital values. An evaluation time period for one or more bits of the digital representation is longer than for one or more other bits in the digital representation. The DAC includes a resistor ladder. Reference voltages of the DAC are increased for evaluation of the least significant bit (LSB) to obtain more accurate results without increasing a number of resistors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.