Low-power analog-to-digital converter
US6480133B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jan 19, 2001 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Jan 19, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/141
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An A/D converter having folding circuits for being supplied with analog signal pairs and reference voltage pairs and for outputting folded differential current pairs; first comparators for comparing the differential current pairs supplied from the folding circuits and for outputting higher 3 bits of a Gray code; sine wave generators for outputting 4-phase sine wave pairs; a current interpolation circuit for interpolating the 4-phase sine wave pairs and outputting 32 sine wave pairs; second comparators for comparing the sine wave pairs with each other respectively: and a Gray code encoder for encoding the outputs of the second comparators into lower 5 bits of the Gray code. Thus, the A/D converter can be made high in speed, lower in operating voltage, finer in density and higher in integration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.