Output stage for a communication contact for a data carrier
US6581844B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 2001 |
| Grant date | Jun 24, 2003 |
| Priority date | — |
| Expiry date | Aug 4, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/073
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An output stage (22; 26; 29) of a data carrier (2; 25; 28), which output stage is connected to a communication contact (9), said data carrier being adapted to provide contactless communication via an antenna stage (13) and contact-bound communication via the communication contact (9), includes a first transistor (T1; T4) having a first control terminal (G1; G4), a first input terminal (S1; D4) and a first output terminal (D1; S4), and a second transistor (T2) having a second control terminal (G2), a second input terminal (D2) and a second output terminal (S2), and a control stage (23; 31) for supplying first control information (SI1) to the first control terminal (G1), in order to drive the first transistor (T1; T4) into its conductive state, and for supplying second control information (SI2) to the second control terminal (G2), in order to drive the second transistor (T2) into its conductive state, in which stage an internal supply voltage (VINT), derived from an antenna signal (HF) by a power supply (15) of the data carrier (2; 25; 28) during contactless communication, can be supplied to the first input terminal (S1) and a reference potential (GND) can be supplied to the second o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.