TRANSPONDER CIRCUIT

• US 20090042515A1
• Filed: 07/29/2008
• Published: 02/12/2009
• Est. Priority Date: 07/09/2002
• Status: Abandoned Application

• Current Assignee: Rudiger Hutter, Thomas Ostertag
• Original Assignee: Rudiger Hutter, Thomas Ostertag
• Inventors: Hutter, Rudiger, OSTERTAG, Thomas
• Application Number:
  US12/181,967
• Publication Number:
  US 20090042515A1
• Time in Patent Office: Days
• US Class Current: 455/73
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs

Abstract

The invention relates to a transponder circuit comprising a high-quality resonator and a demodulator. After being demodulated, the AM-modulated signal emitted by an emitting and receiving appliance has a frequency corresponding to the resonance frequency of the high-quality resonator, for exciting the high-quality resonator. Said transponder circuit also comprises a rectifier, an energy accumulator and a semiconductor circuit which are connected downstream of the resonator. The input impedance of the high-quality resonator is adapted to the loaded impedance of the semiconductor circuit in such a way that a supply voltage for the semiconductor circuit is obtained in the energy accumulator by means of the impedance transformation. Data and/or measuring values can be retrieved and/or updated in a non-contact manner by radio by means of the transponder circuit. The inventive transponder circuit can be applied to ID generators, sensor systems which are self-sufficient in energy or memories for data, for example for measuring systems.

Claims

1. A transponder circuit with a resonator with a high quality factor and a demodulator, whereby an AM-modulated signal that is transmitted by a transmitter/receiver device and that after its demodulation has a frequency for exciting the resonator with a high quality factor that corresponds to the resonance frequency of the resonator with a high quality factor, wherein

said transponder circuit additionally has a rectifier, an energy store, and a semiconductor circuit that are downstream of said resonator and the input impedance of said resonator with a high quality factor is matched to the load impedance of said semiconductor circuit such that a supply voltage is obtained for said semiconductor circuit in said energy store by impedance transformation.

2. The transponder circuit in accordance with claim 1, further comprising

a broadband signal is used for exciting configured to excite said resonator.

3. The transponder circuit in accordance with claim 1, further comprising

a two-tone signal configured to excite said resonator.

4. The transponder circuit in accordance with claim 1, wherein

the frequency of the excitation signal is matched to the resonance frequency of said resonator (tracking).

5. The transponder circuit in accordance with claim 1 wherein

a quartz is used as resonator with a high quality factor.

6. The transponder circuit in accordance with claim 1 wherein

a piezoelectric resonator is used as resonator with a high quality factor.

7. The transponder circuit in accordance with claim 6, wherein

a piezoelectric resonator made of langasite is used as resonator with a high quality factor.

8. The tansponder circuit in accordance with claim 6, wherein

a piezoelectric resonator made of gallium orthophosphate is used as resonator with a high quality factor.

9. The transponder circuit in accordance with claim 6, wherein

a piezoelectric resonator made of lithium niobate is used as resonator with a high quality factor.

10. The transponder circuit in accordance with claim 1 wherein

an LC oscillating circuit is used as resonator with a high quality factor.

11. The transponder circuit in accordance with claim 1 wherein

a ceramic resonator is used as resonator with a high quality factor.

12. The transponder circuit in accordance claim 1 wherein

a cable resonator is used as resonator with a high quality factor.

13. The transponder circuit in accordance with claim 1 wherein a dielectric resonator is used as resonator with a high quality factor.

14. The transponder circuit in accordance with claim 1 wherein

acoustic resonators are used as resonators with a high quality factor.

15. The transponder circuit in accordance with claim 1 wherein

an antenna is used as resonator with a high quality factor.

16. The transponder circuit in accordance with claim 1 wherein

tuning-fork oscillators are used as resonators with a high quality factor.

17. The transponder circuit in accordance with claim 1 wherein

mechanical oscillators are used as resonators with a high quality factor.

18. The transponder circuit in accordance with claim 1 wherein

ferrimagnetic resonators are used as resonators with a high quality factor.

19. The transponder circuit in accordance with claim 1 wherein

resonators working with magnetostatic waves are used as resonators with a high quality factor.

20. The transponder circuit in accordance with claim 1 wherein

the stored data are used for calibrating sensors.