Method and device for measuring with synchronous detection and correlated sampling
US7642766B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 2005 |
| Grant date | Jan 5, 2010 |
| Priority date | — |
| Expiry date | Sep 19, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C27/026
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention relates to electronic circuits for measuring, by synchronous detection, weak signals whose reference level is not well known and is subject to large fluctuations. A first correlated double sampling is performed between a time T1 situated just before the start of the measurement pulse and a time T2 situated just before the end of the measurement pulse; subsequently, a second correlated double sampling is performed between time T2 and a time T3 situated after the end of the measurement pulse. Finally, the difference between signal levels coming from the two measurements is taken, this difference being a representation of the signal value Vm considered with respect to a reference level that is intermediate between the reference levels at times T1 and T3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.