RFID tag switched capacitor slicer threshold
US7405659B1 · kind B1 · utility
31Cited by
8References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 26, 2006 |
| Grant date | Jul 29, 2008 |
| Priority date | — |
| Expiry date | Feb 18, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0723
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An RFID tag that receives an RF signal from a reader is arranged to derive a threshold signal from a detected envelope of the RF signal, where the threshold signal is proportional to the detected envelope signal. The detected envelope signal is then compared to the threshold signal to derive a digital signal from the received RF signal. By maintaining the threshold signal proportional to the detected envelope signal, false bit detections due to ripple effect on the received signal and interference from other sources are reduced. The threshold signal may be derived employing a switched capacitor attenuator circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.