Patent ID: 6011488
Filing Date: 2000-01-04
Classification: G01S,G06K,H02M

Abstract:
A radio frequency interface device for a transponder, said device comprising a coil forming the antenna of the transponder and a voltage converting circuit connected to terminals of said coil and to continuous voltage supply terminals of an integrated logic circuit of the transponder, the device being characterized in that the terminals of the coil are connected to floating potentials with respect to a substrate of the transponder in such a way that none of the terminals of the coil have a potential which passes below a potential of the substrate, and in that said voltage converting circuit is a voltage tripler which comprises a first rectifier connected to the terminals of the coil, the first rectifier comprising a first diode connected in series with a first capacitor, a second rectifier connected to terminals of the first diode, the second rectifier comprising a second diode connected in series with a second capacitor, and a third rectifier connected to terminals of the first capacitor, the third rectifier comprising a third diode connected in series with a third capacitor.