Patent ID: 8285204

Claim:
A contactless data transmission device comprising: an antenna circuit supplying an alternating voltage in the presence of an alternating excitation field; a charge modulation transistor having a control terminal receiving a charge modulation signal having at least one low state and one high state, and a conduction terminal receiving the alternating voltage; a rectifier circuit for producing, from the alternating voltage, an unboosted direct voltage, and a control circuit electrically powered by the unboosted direct voltage, for supplying a first charge modulation signal which, in the high state, has an unboosted voltage level; and a booster circuit for supplying a boosted direct voltage greater than a peak value of the alternating voltage, the booster circuit comprising a voltage adaptation circuit for transforming the first charge modulation signal into a second charge modulation signal which, in the high state, has a voltage level equal to the boosted direct voltage, the second charge modulation signal being applied to the control terminal of the charge modulation transistor.