US 2013/0281019 A1Published application

Transmitting circuit for a contactless communicating communication partner device

AssigneeNXP B.V.

InventorsPeter Raggam, Erich Merlin

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Abstract

In a near field communication partner device (1) intended for the contactless transmission of digital data to be transmitted having a transmission circuit (2), the transmission circuit (2) comprises a modulation circuit (17) for the amplitude modulation of a carrier signal (CS), which modulation circuit (17) comprises a circuit stage (20, 20′) for producing a plurality of different resistance values (RW1, RW1′) that act on a signal output (TX1, TX2), which resistance values (RW1, RW1′) can be transformed, by means of a signal processing circuit (3) arranged to transform resistance values that belongs to the communication partner device (1), into transformed resistance values (RW2, RW2′), which transformed resistance values (RW2, RW2′) are responsible for damping a transmission coil (7) of the communication partner device (1) when modulated low-level carrier signal sections are generated in a modulated carrier signal.

Claims4

Dependent claims

A near field communication partner device for contactless transmission of data having a transmission mode and comprising:

a transmission circuit comprising:
a data signal source for emitting data signals;
a carrier signal generator for generating a carrier signal, the carrier signal in a transmitting mode being subjected to amplitude modulation of a given degree of modulation in accordance with the data signals to be transmitted;
a modulation-control circuit for generating modulation-control signals that takes account of the data signal and that is designed to generate different modulation control signals;
a modulation circuit having a circuit stage, the modulation circuit generating the modulated carrier signal by modulating the carrier signal as a function of the modulation-control signals, the modulated carrier signal having both unmodulated carrier signal sections and modulated carrier signal sections;
and
a signal output for emitting the modulated carrier signal, the signal output supplying the signal processing circuit, and the circuit stage is controllable to produce a plurality of different resistance values that act on the signal output and wherein the different modulation-control signals are assigned to the different resistance values, each of the different resistance values is produced as a result of the different modulation-control signals assigned to the respective resistance value being fed to the circuit stage;
a signal processing circuit connected to the transmission circuit, the signal processing circuit transforming resistance values;
and
a transmission coil connected to the signal processing circuit.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/924,459Filed 21 Jun 2013
Priority: EP 04103201.26 Jul 2004
Published: 24 Oct 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04W 4/80
Services specially adapted for wireless communication networks; Facilities therefor: services using short range communication, e.g. near-field…
G06K 19/0723
With integrated circuit chips: the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on…
H04B 5/266
Using coils: one coil at each side, e.g. with primary and secondary coils
H04B 5/22
Characterised by the transmission technique; characterised by the transmission medium: capacitive coupling

Family

Application11/631,808Continuation · filed 23 Sep 2010
Application13/924,459Continuation
US 2011/0014883 A1Published application
US 8,494,446 B2Related patent
US 8,781,395 B2Related patent
US 2013/0281019 A1This patent

From the US filing history. Foreign family members aren’t listed.

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