| 摘要 |
<p>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 power supply means (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 output terminal (S2), and in which the second input terminal (D2) is connected to the communication contact (9) of the data carrier (2; 25; 28). The output stage (22; 26; 29) now includes inhibit means (R; D; 30, 31, T4), which are adapted to prevent an analysis current (IA) having an analysis current strength from being fed from the communication contact (9) into the data carrier (2; 25; 28) via the first transistor (T1; T4), the analysis current (IA) having the analysis current strength being suited for the analysis of the power consumption of the data carrier (2; 25; 28) and for hacking communication data (VKD) processed in the data carrier (2; 25; 28).</p> |
