Transmitting circuit for a contactless communicating communication partner device
US8494446B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2005 |
| Grant date | Jul 23, 2013 |
| Priority date | — |
| Expiry date | May 8, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B5/263
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a communication partner device (1) intended for the contactless transmission of digital data to be transmitted having a transmission circuit (2), the transmission circuit (2) comprises a modulation circuit (17) for the amplitude modulation of a carrier signal (CS), which modulation circuit (17) comprises a circuit stage (20, 20′) for producing a plurality of different resistance values (RW 1, RW 1′) that act on a signal output (TX1, TX2), which resistance values (RW1, RW1′) can be transformed, by means of a signal processing circuit (3) arranged to transform resistance values that belongs to the communication partner device (1), into transformed resistance values (RW2, RW2′), which transformed resistance values (RW2, RW2′) are responsible for damping a transmission coil (7) of the communication partner device (1) when modulated low-level carrier signal sections are generated in a modulated carrier signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.