Inductive coupling data send/receive circuit
US6540147B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 22, 2001 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | Aug 22, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B5/48
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An inductive coupling data receiving device having an inductive-type antenna circuit that has a coil through which an antenna signal passes, and a control circuit having binary ports that can be set to high impedance. The device has at least two filters arranged to receive a charge modulation signal that is present in the antenna signal on a first terminal, each connected by their other terminal to a control circuit port. The control circuit is arranged to select one of the filters by setting the port connected to the filter to be selected to “1”, and by setting the port connected to the other filter to high impedance state. Particularly applied to contactless smart card readers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.