Inductive Power and Data Transmission System Based on Class D and Amplitude Shift Keying

• US 20080198947A1
• Filed: 02/15/2007
• Published: 08/21/2008
• Est. Priority Date: 02/15/2007
• Status: Active Grant

• Current Assignee: Med El Elektromedizinische Geraete GmbH
• Original Assignee: Med El Elektromedizinische Geraete GmbH
• Inventors: Zierhofer, Clemens M.
• Granted Patent: US 8,023,586 B2
• Time in Patent Office: Days
• US Class Current: 375/300
• CPC Class Codes: A61B 5/076 Permanent implantations telemetry using implanted circuitry A61B5/0031; implanted stimulators for therapy A61N1/3605, A61N1/362, A61N1/372
• CPC Class Codes: H04B 5/70 specially adapted for specific purposes
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A rf signal transfer link is described which uses amplitude shift keying (ASK) to transfer rf data pulses. The link minimizes state transition time at the end of each data pulse.

Claims

1. An rf signal transfer link comprising:

a signal transfer link for using amplitude shift keying (ASK) to transfer rf data pulses, the link including means for minimizing state transition times.

2. A link according to claim 1, wherein the means for minimizing includes means for changing a resonant circuit quality factor.

3. A link according to claim 1, further comprising:

a parallel-tuned receiver circuit for receiving the rf data pulses.

4. A link according to claim 1, further comprising:

a series-tuned resonant transmitting circuit for transmitting the rf data pulses.

5. A link according to claim 4, wherein the series-tuned resonant transmitting circuit includes a class D amplifier driver.

6. A link according to claim 5, wherein the class D amplifier is integrated onto a single microchip.

7. A link according to claim 4, wherein the series-tuned resonant transmitting circuit includes a damping resistor R_D in series with a transmitter circuit inductance during the rf off time.

8. A link according to claim 7, wherein the damping resistor R_D is an open circuit with infinite resistance.

9. A link according to claim 7, wherein the damping resistor R_D has an optimal resistance to minimize receiver circuit state transition times.

10. A link according to claim 7, wherein the damping resistor R_D has a resistance which causes the resonant receiving circuit to behave such that rf waveform decay is independent of coupling factor.

11. A receiver circuit for an implanted electronic system, the circuit comprising:

an implanted receiver circuit for receiving amplitude shift keyed (ASK) rf data pulses from an external transmitter, the receiver circuit including means for minimizing state transition times.

12. A receiver circuit according to claim 11, wherein the means for minimizing includes means for changing a resonant circuit quality factor.

13. A transmitter circuit for an implanted electronic system, the circuit comprising:

an external transmitter circuit for transmitting amplitude shift keyed (ASK) rf data pulses to an implanted receiver, the transmitter circuit including means for minimizing state transition times.

14. A transmitter circuit according to claim 13, wherein the means for minimizing includes means for changing a resonant circuit quality factor.

15. A transmitter circuit according to claim 13, further comprising:

a series-tuned resonant transmitting circuit for transmitting the rf data pulses.

16. A transmitter circuit according to claim 15, wherein the series-tuned resonant transmitting circuit includes a class D amplifier driver.

17. A transmitter circuit according to claim 16, wherein the class D amplifier is integrated onto a single microchip.

18. A transmitter circuit according to claim 15, wherein the series-tuned resonant transmitting circuit includes a damping resistor R_D in series with a transmitter circuit inductance during the rf off time.

19. A transmitter circuit according to claim 18, wherein the damping resistor R_D is an open circuit with infinite resistance.

20. A transmitter circuit according to claim 18, wherein the damping resistor R_D has an optimal resistance to minimize receiver circuit state transition times.

21. A transmitter circuit according to claim 18, wherein the damping resistor R_D has a resistance which causes the resonant receiving circuit to behave such that rf waveform decay is independent of coupling factor.

22. An rf transfer link comprising:

a signal transfer link for using amplitude shift keying (ASK) to transfer rf data pulses, the link including means for causing the system to behave such that rf waveform decay is independent of coupling factor.