Patent ID: 7130581

Claim:
A wireless data communication device particularly for a portable object, the device including an oscillator circuit, which produces high frequency signals, and a signal processing unit connected to the oscillator circuit, wherein a connection structure of one part of the oscillator circuit, which produces the high frequency signals, is arranged to act as antenna for the transmission of data by means of stray signals transmitted by the connection structure, wherein the processing unit provides at least one control signal to the oscillator circuit, said control signal depending upon the data to be transmitted by means of the stray signals, and wherein the oscillator circuit includes a frequency synthesiser connected to a reference oscillator unit, the synthesiser including, in a phase lock loop, a voltage controlled oscillator, followed by an amplifier, which provides high frequency signals, a frequency divider for signals provided by the voltage controlled oscillator, and a phase detector comparing the frequency of the signals provided by the frequency divider and the frequency of the reference signals provided by the reference oscillator unit, the output of the phase detector being connected to the voltage controlled oscillator, and wherein the control signal, provided by the processing unit, controls the switching on or off of the amplifier for the transmission of data by amplitude modulation of the stray signals.