Shaped load modulation in a near field communications (NFC) device
US8831515B2 · kind B2 · utility
1Cited by
17References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 12, 2011 |
| Grant date | Sep 9, 2014 |
| Priority date | — |
| Expiry date | Feb 24, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B5/79
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and apparatus is disclosed to compensate for overshoot and/or undershoot in a transmission sequence by shaping the transmission sequence according to a shaping envelope to lengthen its rise time and/or fall time to provide a modified transmission sequence. The shaping envelope may represent a trigonometric function, a polynomial function, a piecewise function or any other function that lengthens the rise time and/or the fall time of the transmission sequence. The modified transmission sequence adjusts an impedance of an antenna to load modulate a carrier wave that is inductively coupled to it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.