Electromagnetic transponder reader
US6847256B2 · kind B2 · utility
1Cited by
5References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 4, 2003 |
| Grant date | Jan 25, 2005 |
| Priority date | — |
| Expiry date | Jul 13, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D5/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and a circuit for demodulating a signal transmitted by an electromagnetic transponder, including a sensor of a variable which is a function of the load formed by the transponder on an oscillating circuit, a phase demodulator and an amplitude demodulator at least functionally in parallel and receiving a signal coming from said sensor, a summer of the results provided by the demodulators, and a delay element in series with a first one of said demodulators, to compensate for a possible propagation time difference therebetween.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.