Method and system for sharing a single antenna for frequency modulation (FM) reception or FM transmission and near field communication (NFC)

Patent metadata

Field	Value
Publication number	US-9160288-B2
Application number	US-201213558187-A
Country	US
Kind code	B2
Filing date	Jul 25, 2012
Priority date	Mar 19, 2007
Publication date	Oct 13, 2015
Grant date	Oct 13, 2015

Abstract

Aspects of a method and system for sharing a single antenna for frequency modulation (FM) transmission or FM reception, and near field communication (NFC) are presented. Aspects of a system may include at least one circuit that enables, via a single antenna, simultaneous transmission of an FM signal and transmission of an NFC signal or reception of an NFC signal.

First claim

What is the claimed is:

1. A method for simultaneously receiving a plurality of signals via a single antenna, said method comprising:
simultaneously receiving said plurality of signals via said single antenna;
blocking first portions of said plurality of signals received, at frequencies outside of a frequency modulation (FM) band including signals in an FM frequency range, via a first signal path from said single antenna;
blocking second portions of said plurality of signals received, at frequencies outside of a near field communication (NFC) band including signals in an NFC frequency range, via a second signal path from said single antenna, said second signal path being different than said first signal path;
receiving a first signal of said plurality of signals at an FM circuit via said first signal path, said first signal being of a frequency within said FM-band; and
receiving a second signal of said plurality of signals at an NFC circuit via said second signal path, said second signal being of a frequency within said NFC-band.

2. The method according to claim 1 , further comprising:
determining, by a processing circuit, whether a carrier frequency of at least one of said plurality of signals is within said NFC-band; and
determining, by said processing circuit, whether a carrier frequency of said at least one of said plurality of signals is within said FM-band.

3. The method according to claim 1 , further comprising:
filtering, by said FM circuit, said first signal.

4. The method according to claim 1 , wherein said blocking first portions of said plurality of signals received includes blocking, via said first signal path, signal energy of said plurality of signals that are outside of said FM-band.

5. The method according to claim 1 , wherein said blocking second portions of said plurality of signals received includes blocking, via said second signal path, signal energy of said plurality of signals that are outside of said NFC-band.

6. The method according to claim 1 , wherein
said first signal path includes a capacitor and an inductor, and
said first portions of said plurality of signals are blocked via said first signal path by an impedance of said capacitor and said inductor approximating a short circuit.

7. The method according to claim 1 , wherein
said second signal path includes a capacitor and an inductor, and
said second portions of said plurality of signals are blocked via said second signal path by an impedance of said capacitor and said inductor approximating a short circuit.

8. An apparatus comprising:
an antenna that simultaneously receives a plurality of signals; and
processing circuitry that
blocks first portions of said plurality of signals received, at frequencies outside of a frequency modulation (FM) band including signals in an FM frequency range, via a first signal path from said single antenna; and
blocks second portions of said plurality of signals received, at frequencies outside of a near field communication (NFC) band including signals in an NFC frequency range, via a second signal path from said single antenna, said second signal path being different than said first signal path;

an FM circuit that receives a first signal of said plurality of signals via said first signal path, said first signal being of a frequency within said FM-band; and
an NFC circuit that receives a second signal of said plurality of signals via said second signal path, said second signal being of a frequency within said NFC-band.

9. The apparatus according to claim 8 , wherein said processing circuitry
determines whether a carrier frequency of at least one of said plurality of signals is within said NFC-band, and
determines whether a carrier frequency of said at least one of said plurality of signals is within said FM-band.

10. The apparatus according to claim 8 , wherein said FM circuit filters said first signal.

11. The apparatus according to claim 8 , wherein said blocking first portions of said plurality of signals received includes blocking, via said first signal path, signal energy of said plurality of signals that are outside of said FM-band.

12. The apparatus according to claim 8 , wherein said blocking second portions of said plurality of signals received includes blocking, via said second signal path, signal energy of said plurality of signals that are outside of said NFC-band.

13. The apparatus according to claim 8 , further comprising:
a capacitor and an inductor located in said first signal path, wherein
said first portions of said plurality of signals are blocked via said first signal path by an impedance of said capacitor and said inductor approximating a short circuit.

14. The apparatus according to claim 8 , further comprising:
a capacitor and an inductor located in said second signal path, wherein
said second portions of said plurality of signals are blocked via said second signal path by an impedance of said capacitor and said inductor approximating a short circuit.

15. A non-transitory computer readable medium storing computer readable instructions that, when executed by an apparatus including a signal antenna and a processing circuit, cause the apparatus to:
simultaneously receive said plurality of signals via said single antenna;
block first portions of said plurality of signals received, at frequencies outside of a frequency modulation (FM) band including signals in an FM frequency range, via a first signal path from said single antenna;
block second portions of said plurality of signals received, at frequencies outside of a near field communication (NFC) band including signals in an NFC frequency range, via a second signal path from said single antenna, said second signal path being different than said first signal path;
receive a first signal of said plurality of signals at an FM circuit of said apparatus via said first signal path, said first signal being of a frequency within said FM-band; and
receive a second signal of said plurality of signals at an NFC circuit of said apparatus via said second signal path, said second signal being of a frequency within said NFC-band.

16. The non-transitory computer readable medium according to claim 15 , wherein the apparatus is further caused to:
determine, by said processing circuit, whether a carrier frequency of at least one of said plurality of signals is within said NFC-band; and
determine, by said processing circuit, whether a carrier frequency of said at least one of said plurality of signals is within said FM-band.

17. The non-transitory computer readable medium according to claim 15 , wherein the apparatus is further caused to:
filter, by said FM circuit, said first signal.

18. The non-transitory computer readable medium according to claim 15 , wherein said blocking first portions of said plurality of signals received includes blocking, via said first signal path, signal energy of said plurality of signals that are outside of said FM-band.

19. The non-transitory computer readable medium according to claim 15 , wherein said blocking second portions of said plurality of signals received includes blocking, via said second signal path, signal energy of said plurality of signals that are outside of said NFC-band.

20. The non-transitory computer readable medium according to claim 15 , wherein
said first signal path includes a capacitor and an inductor, and
said first portions of said plurality of signals are blocked via said first signal path by an impedance of said capacitor and said inductor approx

Assignees

• Rofougaran Ahmadreza
• Rofougaran Maryam
• Broadcom Corp

Inventors

• Rofougaran Ahmadreza
• Rofougaran Maryam

Classifications

• H03G3/3068

  Circuits generating control signals for both R.F. and I.F. stages · CPC title

• H03F2200/156

  One or more switches are realised in the feedback circuit of the amplifier stage · CPC title

• H03F2200/451

  the amplifier being a radio frequency amplifier · CPC title

• H03F3/245

  with semiconductor devices only · CPC title

• H03F2200/129

  there being a feedback over the complete amplifier · CPC title