Switched-capacitor summer circuits and methods and systems using the same
US6570519B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 12, 2001 |
| Grant date | May 27, 2003 |
| Priority date | — |
| Expiry date | Jul 12, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/452
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A switched- capacitor summer 400 includes an operational amplifier 206 having an input and an output, first and second parallel capacitors 307, 401, first switching circuitry 308, 404 and second switching circuitry 402, 403. First switching circuitry 308, 404 discharges first capacitor 307 during a first timing phase and couples second capacitor 401 between the input and the output of operational amplifier 306 during a first timing phase. Second switching circuitry 402, 403 couples a first capacitor 307 between the input and output of operational amplifier 306 during the second phase to transfer charge from capacitor CS to capacitor 307 and charge up capacitor CH during the second phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.