RFID tags with differential demodulators
US8325042B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 2010 |
| Grant date | Dec 4, 2012 |
| Priority date | — |
| Expiry date | Jul 14, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/07749
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An Integrated Circuit (IC) for an RFID tag contains at least two demodulators, each having an RF input port configured to receive and demodulate an RF input signal, with one or more of the RF inputs being a differential signal, and with at least two of the RF input ports electrically isolated from each other. The RFID IC contains two or more envelope detectors for recovering analog modulation envelope signals from the RF signals, and one or more slicers to convert the modulation envelopes to at least one digital signal. The analog signals from the two envelope detectors may be first combined, then converted to a digital signal. Alternatively, the analog modulation envelopes may be first converted to digital signals then combined in a digital combiner. Alternatively, the analog modulation envelopes may be converted to separate digital signals without being combined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.