TRANSPONDER CIRCUIT ARRANGEMENT AND METHOD FOR OPERATING A DEMODULATOR

• US 20080258874A1
• Filed: 04/17/2008
• Published: 10/23/2008
• Est. Priority Date: 04/17/2007
• Status: Abandoned Application

• Current Assignee: Infineon Technologies Austria Ag (Infineon Technologies AG)
• Original Assignee: Infineon Technologies Austria Ag (Infineon Technologies AG)
• Inventors: KARGL, Walter, HOFER, Guenter, KLAPF, Christian, HOLWEG, Gerald, MISSONI, Albert
• Application Number:
  US12/104,477
• Publication Number:
  US 20080258874A1
• Time in Patent Office: Days
• US Class Current: 340/10.1
• CPC Class Codes: G06K 19/0724 the arrangement being a circuit for communicating at a plurality of frequencies, e.g. for managing time multiplexed communication over at least two antennas of different types
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card

Abstract

A transponder circuit arrangement including antenna contacts to which an antenna signal can be applied. The antenna signal includes at least one signal in one transmission band of a plurality of transmission bands. The transponder circuit arrangement also includes a detector adapted to detect whether the antenna signal includes a signal in a predetermined transmission band, and a demodulator adapted to demodulate the signal in the predetermined transmission band when the signal has been detected therein, and otherwise to demodulate a signal in another transmission band.

Claims

1. A transponder circuit arrangement comprising:

antenna contacts to which an antenna signal, which comprises at least one signal in one transmission band of a plurality of transmission bands, can be applied;

a detector adapted to detect whether the antenna signal comprises a signal in a predetermined transmission band; and

a demodulator adapted to demodulate the signal in the predetermined transmission band if the signal has been detected in the predetermined transmission band, and otherwise to demodulate a signal in another transmission band.

2. The transponder circuit arrangement as claimed in claim 1, further comprising a selection device adapted to set the transmission band in which the demodulator demodulates a signal.

3. The transponder circuit arrangement as claimed in claim 1, wherein the detector is further adapted to detect from a plurality of transmission bands, which has a predetermined order of rank, the transmission band with the highest order of rank in which a signal is located.

4. The transponder circuit arrangement as claimed in claim 3, wherein the detector is further adapted to detect the transmission bands in the predetermined order of rank until a signal is detected in at least one of the transmission bands.

5. The transponder circuit arrangement as claimed in claim 3, further comprising a selection device, adapted to set the transmission band with the highest rank in which a signal is located, as transmission band in which the demodulator demodulates.

6. The transponder circuit arrangement as claimed in claim 1, further comprising a supply device adapted to feed the transponder circuit arrangement.

7. The transponder circuit arrangement as claimed in claim 6, wherein an operating range of the supply device can be set.

8. The transponder circuit arrangement as claimed in claim 2, wherein the selection device is further adapted to switch the operation of a digital section of the transponder circuit arrangement.

9. The transponder circuit arrangement as claimed in claim 1, wherein the plurality of transmission bands comprise a UHF band and an HF band.

10. The transponder circuit arrangement as claimed in claim 1, wherein the detector comprises a storage device.

11. The transponder circuit arrangement as claimed in claim 1, wherein the detector comprises a state engine.

12. A transponder circuit arrangement comprising:

antenna contacts to which an antenna signal, which comprises at least one signal in one transmission band of a plurality of transmission bands, can be applied;

a detector adapted to detect from a group of transmission bands, which has a predetermined order of rank, the transmission band with the highest rank in which a signal is located;

a demodulator, adapted to demodulate the signal in the transmission band having the highest rank of the order of rank if a signal has been detected in the transmission band having the highest rank of the order of rank and otherwise to demodulate a signal in another transmission band; and

a selection device, which is coupled to the detector and the demodulator, and which is adapted to set the transmission band with the highest rank in which a signal is located, so that the demodulator demodulates the signal in that transmission band.

13. The transponder circuit arrangement as claimed in claim 12, further comprising a supply device adapted to feed the transponder circuit arrangement when an antenna signal is present, wherein the transponder circuit arrangement is adapted to feed independently of the signal which is comprised in the antenna signal or to feed independently of the signals which are comprised in the antenna signal.

14. The transponder circuit arrangement as claimed in claim 12, further comprising a decoder which follows the demodulator and can be switched.

15. The transponder circuit arrangement as claimed in claim 12, further comprising an antenna which is coupled to the antenna contacts, wherein the antenna can be operated in the predetermined transmission band and in the other transmission band.

16. A method for operating a demodulator, comprising:

providing an antenna signal which comprises at least one signal in one transmission band of a plurality of transmission bands;

detecting whether the antenna signal comprises a signal in a predetermined transmission band; and

demodulating the signal if the signal has been detected in the predetermined transmission band, and otherwise demodulating a signal in another transmission band.

17. The method as claimed in claim 16, wherein, from a plurality of transmission bands, which has a predetermined order of rank, the transmission band with the highest rank is detected in which a signal is located.

18. The method as claimed in claim 16, wherein the transmission bands are detected in the predetermined order of rank with regard to a signal until a signal has been detected in at least one of the transmission bands.

19. The method as claimed in claim 16, wherein the demodulation occurs in the transmission band with the highest rank in which a signal is located.

20. The method as claimed in claim 16, further comprising:

providing a supply voltage, which is converted from the antenna signal, for operating the demodulator.

21. The method as claimed in claim 20, wherein the supply voltage is provided independently of the signal which is comprised in the antenna signal or independently of the signals which are comprised in the antenna signal.

22. The method as claimed in claim 16, wherein the predetermined transmission band is an HF band and the other transmission band is a UHF band.

23. The method as claimed in claim 16, wherein the predetermined transmission band is a UHF band and the other transmission band is an HF band.

24. A transponder circuit arrangement comprising:

means for applying an antenna signal which comprises at least one signal in one transmission band of a plurality of transmission bands;

means for detecting whether the antenna signal comprises a signal in a predetermined transmission band; and

means for demodulating the signal when the signal has been detected in the predetermined transmission band, and otherwise demodulating a signal in another transmission band.