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Transmitting circuit for a contactless communicating communication partner device

  • US 20110014883A1
  • Filed: 06/30/2005
  • Published: 01/20/2011
  • Est. Priority Date: 07/06/2004
  • Status: Active Grant
First Claim
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1. transmission circuit for a communication partner device intended for the contactless transmission of data to be transmitted, with which communication partner device a transmitting mode of operation is possible, a carrier signal being subjected, in the transmitting mode, to amplitude modulation of a given degree of modulation in accordance with the data to be transmitted, and a modulated carrier signal having unmodulated carrier signal sections and modulated carrier signal sections being obtained as a result, and which communication partner device has a signal processing circuit connected to the transmission circuit and a transmission coil connected to the signal processing circuit, which signal processing circuit is designed to transform resistance values and which transmission circuit has a carrier-signal generator for generating the carrier signal, a modulation-control circuit for generating modulation-control signals that take account of the data to be transmitted, a modulation circuit for modulating the carrier signal as a function of the modulation-control signals and for generating the modulated carrier signal and a signal output for emitting the modulated carrier signal which signal output is intended to supply the signal processing circuit the modulation circuit containing a circuit stage which circuit stage is designed to produce a resistance value that acts on the signal output and can be transformed by means of the signal processing circuit wherein the circuit stage is designed to be controllable to produce a plurality of different resistance values that act on the signal output wherein the modulation-control circuit is designed to generate different modulation-control signals that are assigned to the different resistance values, and wherein each of the different resistance values is produced as a result of the different modulation-control signals that are assigned to the resistance value concerned being fed to the circuit stage.

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