Switched-capacitor sigma-delta analog-to-digital converter with input voltage overload protection
US6040793A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1998 |
| Grant date | Mar 21, 2000 |
| Priority date | — |
| Expiry date | Mar 18, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/43
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A sigma-delta analog-to-digital converter includes an integrator having an input and an output and an integrator capacitor connected between the input and output. A switched-capacitor input circuit includes at least one input capacitor, an input sampling switching circuit and an input delivery switching circuit. The input sampling switching circuit includes at least one input sampling switch operable to connect the input capacitor to be charged by an input voltage at a sampling rate. The input delivery switching circuit includes at least one input delivery switch operable to connect the input capacitor to transfer charge to the integrator capacitor at a first transfer rate. A switched-capacitor feedback circuit is connected in a feedback path between the input and output of the integrator. The feedback circuit includes at least one feedback capacitor, a feedback sampling switching circuit and a feedback delivery switching circuit. The feedback sampling switching circuit includes at least one feedback sampling switch operable to connect the feedback capacitor to be charged by a feedback reference voltage at the sampling rate. The feedback delivery switching circuit includes at least…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.