Method of processing of signal transmitted from the analog NFC driver and system for realization of said method

Patent metadata

Field	Value
Publication number	US-10291447-B2
Application number	US-201615578921-A
Country	US
Kind code	B2
Filing date	Jun 1, 2016
Priority date	Jun 2, 2015
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

During the contactless transfer of the data from PICC ( 1 ) to PCD ( 4 ) with the load modulation within PICC ( 1 ) the analog signal between the transmitting antenna ( 3 ) and the output of the driver ( 2 ) is demodulated. From the demodulated output the digital data are generated for the direction of the subsequent modification of the signal led to the PICC ( 1 ) antenna set. The digital data gather from the demodulated signal are used for the amplification and/or attenuation of the signal received on the side of the PCD ( 4 ) and/or for synchronization or other modification of the signal on the side of the PICC ( 1 ), whereby no further modification of the driver ( 2 ) is needed. The connection on the LA, LB outputs appears to the driver ( 2 ) by its characteristics, mainly by its impedance, in the same way as the connected antenna ( 3 ) of the original connection according to the prior state of the art. Such processing and connection allows to use broadly available analog drivers ( 2 ) which can be combined with various other elements of other producers, which achieves real compatibility and high amount of freedom when designing the circuits, as well as the independence from the particular producer of the chips.

First claim

The invention claimed is:

1. A system for a processing of a signal transmitted from an analogue near field communication (NFC) driver ( 2 ) within a proximity integrated circuit card (PICC) ( 1 ) during a contactless transfer of data from the PICC ( 1 ) to a proximity coupling device (PCD) ( 4 ) with a load modulation, which includes the driver ( 2 ) with an analogue output with a modulated signal to which an antenna ( 3 ) for a transmission towards the PCD ( 4 ) is connected is characterized by the fact, that between the PICC ( 1 ) transmitting antenna ( 3 ) and the analogue output of the driver ( 2 ) of this antenna ( 3 ) is within a framework of the PICC a demodulator ( 5 ) for a demodulation of the modulated signal transmitted from the driver ( 2 ) to the antenna ( 3 ) is connected, whereby an output of the demodulator is connected to a digitizer ( 6 ); wherein a circuit of the demodulator includes two resistors (R 2 , R 3 ) on branches connected to outputs (LA, LB) of the driver ( 2 ) for fine tuning of an impedance.

2. The system for the processing of the signal transmitted from the analogue NFC driver ( 2 ) according to the claim 1 is characterized by the fact, that a second driver is connected to the digitizer ( 6 ), whereby the second driver is designed to change an amplitude of the signal detected on a side of the PCD ( 4 ); preferably it changes the amplitude by means of a phase change.

3. The system for the processing of the signal transmitted from the analogue NFC driver ( 2 ) according to claim 1 is characterized by the fact, that a PICC ( 1 ) antenna set includes a second antenna ( 32 ) wound on a common core together with a winding of the antenna ( 3 ).

4. The system for the processing of the signal transmitted from the analogue NFC driver ( 2 ) according to the claim 3 is characterized by the fact, that, a winding of the second antenna ( 32 ) is connected to an output of the signal which is modified on a basis of data from the demodulator ( 5 ) and/or the digitizer ( 6 ).

5. A system for a processing of a signal transmitted from an analogue near field communication (NFC) driver ( 2 ) within a proximity integrated circuit card (PICC) ( 1 ) during a contactless transfer of data from the PICC ( 1 ) to a proximity coupling device (PCD) ( 4 ) with a load modulation, which includes the driver ( 2 ) with an analogue output with a modulated signal to which an antenna ( 3 ) for a transmission towards the PCD ( 4 ) is connected is characterized by the fact, that between the PICC ( 1 ) transmitting antenna ( 3 ) and the analogue output of the driver ( 2 ) of this antenna ( 3 ) is within a framework of the PICC a demodulator ( 5 ) for a demodulation of the modulated signal transmitted from the driver ( 2 ) to the antenna ( 3 ) is connected, whereby an output of the demodulator is connected to a digitizer ( 6 ); wherein between the demodulator ( 5 ) and the antenna ( 3 ) there is a branch line for a phase-locked loop, wherein the phase-locked loop is connected to wiring which connects the antenna ( 3 ) with the demodulator ( 5 ).

6. A system for a processing of a signal transmitted from an analogue near field communication (NFC) driver ( 2 ) within a proximity integrated circuit card (PICC) ( 1 ) during a contactless transfer of data from the PICC ( 1 ) to a proximity coupling device (PCD) ( 4 ) with a load modulation, which includes the driver ( 2 ) with an analogue output with a modulated signal to which an antenna ( 3 ) for a transmission towards the PCD ( 4 ) is connected is characterized by the fact, that between the PICC ( 1 ) transmitting antenna ( 3 ) and the analogue output of the driver ( 2 ) of this antenna ( 3 ) is within a framework of the PICC a demodulator ( 5 ) for a demodulation of the modulated signal transmitted from the driver ( 2 ) to the antenna ( 3 ) is connected, whereby an output of the demodulator is connected to a digitizer ( 6 ); wherein the system further includes a switch ( 7 ) by means of which the circuit of the demodulator ( 5 ) is connected to one of multiple drivers ( 2 ); wherein each driver is assignable to an independent secure element placed within the PICC ( 1 ).

7. The system for the processing of the signal transmitted from the analogue NFC driver ( 2 ) according to the claim 6 is characterized by the fact, that the switch ( 7 ) is analogue.

8. A signal processing method, comprising:
transmitting a signal from an analogue near field communication (NFC) driver ( 2 ) during a contactless transfer of data from a proximity integrated circuit card (PICC) ( 1 ) to a proximity coupling device (PCD) ( 4 ), wherein the NFC driver generates a modulated analogue signal encoding data;
inputting the modulated analogue signal to a demodulator ( 5 ) and thereby demodulating the modulated analogue signal;
inputting the demodulated signal to a first antenna ( 3 );
generating digital data from the demodulated signal input to the first antenna;
using the digital data for amplification and/or attenuation of a signal received by the PCD, wherein the signal is amplified and/or attenuated only during a required time period within a single transmission event; and
using the digital data for modulation of a signal transmitted to a second antenna ( 32 ), wherein the first and second antennae are wound on a common core such that they are electromagnetically coupled.

9. The signal processing method of claim 8 , wherein the signal received by the PCD is amplified after completion of a mutual initial setting of a level of the PICC and PCD signals within the single transmission event.

10. The signal processing method of claim 8 , wherein the PICC includes a second active driver directed by means of the digital data from the demodulated signal.

11. A a proximity integrated circuit card (PICC), comprising:
an analogue near field communication (NFC) driver ( 2 ) configured to generate a modulated analogue signal encoding data;
a demodulator ( 5 ) coupled to the NFC driver and configured to demodulate the modulated analogue signal;
a first antenna ( 3 ) coupled to the demodulator such that the demodulated signal input to the first antenna; and
a second antenna ( 32 ), wherein the first and second antennae are wound on a common core such that they are electromagnetically coupled.

12. The PICC of claim 11 , further comprising:
means for generating digital data from the demodulated signal input to the first antenna;
means for using the digital data for amplification and/or attenuation of a signal received by a proximity coupling device (PCD) ( 4 ) configured to be electromagnetically coupled to the first and second antennae; and
means for using the digital data for modulation of a signal transmitted to the second antenna.

13. The PICC of claim 11 , further comprising a second active driver.

Assignees

• Logomotion Sro
• Smk Logomotion Corp
• Smk Kk

Inventors

• Florek Miroslav

Classifications

• E04H2015/201

  with inflatable tubular framework, with or without tent cover · CPC title

• E04H15/20

  inflatable, e.g. shaped, strengthened or supported by fluid pressure · CPC title

• H04B5/0025

  Electricity · mapped topic

• H04L27/06 Primary

  Demodulator circuits; Receiver circuits · CPC title

• H04B5/70

  specially adapted for specific purposes · CPC title