Patent ID: 6168083
Filing Date: 2001-01-02
Classification: G06K

Abstract:
A chip-card comprising: components requiring a supply voltage; a rectifier; an antenna coil coupled to the rectifier; a contact; a control unit; and an AC recognition circuit for recognizing an AC-signal received by the antenna coil and for converting the recognized the received AC-signal to a DC control signal, the AC recognition circuit not being comprised in the components, the chip-card being operable in a contact-coupled mode of operation via the contact and a contactless mode of operation via the antenna coil, a write-read station supplying the supply voltage to the chip-card when coupled to the chip-card, in order to avoid voltage losses both the rectifier and the contact being directly connected to the components, and the DC control signal being provided to the control unit that controls the chip-card to switch between the contact-coupled and contactless modes of operation.