Near-field communication system terminal

1. A device, comprising:

an antenna configured to transmit and receive near-field communication signals and to couple to at least two inputs and to at least two outputs of a near-field communication controller;

a first spectrum spreading element coupled between the antenna and a first input terminal of the near-field communication controller;

a second spectrum spreading element coupled between the antenna and a second input terminal of the near-field communication controller;

a first resistive element coupled in parallel with the first spectrum spreading element;

a second resistive element coupled in parallel with the second spectrum spreading element: and

a low-pass filter at each of the at least two inputs of the near-field communication controller.

2. The device of claim 1 wherein the at least one spectrum spreading element comprises a rectifying element.

3. The device of claim 2 wherein the rectifying element comprises a diode.

4. A method, comprising:

receiving, by a near-field communication device, a differential near-field communication signal;

spreading, by the near-field communication device, a spectrum of the received near-field communication signal; and

processing, by the near-field communication device, the spread-spectrum signal, the processing including low-pass filtering of the spread-spectrum signal, wherein

the low-pass filtering the spread-spectrum signal comprises using first and second low-pass filters, and

the differential near-field communication signal is received at an input of a first spectrum spreading element and an imput of a second spectrum spreading element, where an output of the first spectrum spreading element is coupled to the first low-pass filter, an output of the second spectrum spreading element is coupled to the second low-pass filter. a first resistive element is coupled in parallel with the first spectrum spreading element and a second resistive element is coupled in parallel with the second spectrum spreading element.

5. The method of claim 4 , comprising:

transmitting, by the near-field communication device, an output near-field communication signal.

6. The method of claim 4 , comprising:

generating, using a transponder, the differential near-field communication signal.

7. A system, comprising:

a near-field communication control block;

an antenna configured to transmit and receive near-field communication signals and to couple to at least two inputs and at least two outputs of the near-field communication control block;

a first spectrum spreading element coupled between the antenna and a first input terminal of the near-field communication control block;

a second spectrum spreadin element coupled between the antenna and a second input termininal of the near-field communication control block;

a first resistive element coupled in parallel with the first spectrum spreading element; and

a second resistive element coupled in parallel with the second spectrum spreading element, wherein each of the at least two inputs of the near-field communication control block comprises a low-pass filter.

8. The system of claim 7 wherein the at least one spectrum spreading element comprises a rectifying element.

9. The system of claim 8 wherein the rectifying element comprises a diode.

10. The system of claim 9 wherein the diode is a Schottky diode.

11. The system of claim 7 , comprising:

a transponder configured to communicatively couple to the antenna.

12. A system, comprising:

means for receiving a near-field communication signal;

means for spreading a spectrum of the received near-field communication signal;

means for low-pass filtering the spread-spectrum signal; and

means for processing the low-pass filtered signal, wherein;

the near-field communication signal is a differential signal and the means for low-pass filtering the spread-spectrum signal comprises first and second low-pass filters; and

the means for spreading the spectrum of the received near-field communication signal comprises:

a first spectrum spreading element coupled between the means for receiving and the first low-pass filter;

a second spectrum spreading element coupled between the means for receiving and the second low-pass filter;

a first resistive element coupled in parallel with the first spectrum spreading element; and

a second resistive element coupled in parallel with the second spectrum spreading element.

13. The system of claim 12 wherein the means for receiving is configured to transmit an output near-field communication signal.

14. The system of claim 12 wherein the first spectrum spreading element comprises a rectifying element.

15. The system of claim 14 wherein the rectifying element comprises a diode.

16. The system of claim 15 wherein the diode is a Schottky diode.

17. The system of claim 12 , comprising:

a transponder configured to communicatively couple to the means for receiving.