PASSIVELY POWERING A WIRELESS COMMUNICATIONS DEVICE
First Claim
1. A wireless device comprising:
- an RF interface configured to receive an RF signal and configured to provide an output data signal derived from the RF signal;
logic circuitry configured to receive the output data signal and provide an output analog signal;
power circuitry coupled to the RF interface and configured to provide DC operating power derived from the RF signal to the RF interface and the logic circuitry;
a first impedance matching transformer having an input coupled to the logic circuitry and having an output; and
a first transducer coupled to the output of the first impedance matching transformer and configured to produce an audio signal based on the output analog signal.
5 Assignments
0 Petitions
Accused Products
Abstract
A wireless device includes an RF interface, logic circuitry, power circuitry, an impedance matching transformer, and a transducer. The RF interface is configured to receive an RF signal and provide an output data signal derived from the RF signal. The logic circuitry is configured to receive the output data signal and provide an output analog signal. The power circuitry is coupled to the RF interface and configured to provide DC operating power derived from the RF signal to the RF interface and the logic circuitry. The impedance matching transformer has an input coupled to the logic circuitry and an output. The transducer is coupled to the output of the impedance matching transformer and is configured to produce an audio signal based on the output analog signal.
264 Citations
35 Claims
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1. A wireless device comprising:
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an RF interface configured to receive an RF signal and configured to provide an output data signal derived from the RF signal; logic circuitry configured to receive the output data signal and provide an output analog signal; power circuitry coupled to the RF interface and configured to provide DC operating power derived from the RF signal to the RF interface and the logic circuitry; a first impedance matching transformer having an input coupled to the logic circuitry and having an output; and a first transducer coupled to the output of the first impedance matching transformer and configured to produce an audio signal based on the output analog signal.
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2. The wireless device of claim 1, further comprising:
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a second transducer configured to receive an input audio signal and provide an input analog signal to the logic circuitry; wherein the logic circuitry is further configured to receive the input analog signal and provide an input data signal based on the input analog signal to the RF interface; and wherein the RF interface is further configured to receive the input data signal and modulate the RF signal based on the input data signal.
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3. The wireless device of claim 2, further comprising a second impedance matching transformer coupled between the second transducer and the logic circuitry.
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4. The wireless device of claim 1, wherein the first impedance matching transformer includes a plurality of switches configurable to adjust a turns ratio of the first impedance matching transformer.
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5. The wireless device of claim 2, wherein the logic circuitry includes a digital to analog converter having an output coupled to the first impedance matching transformer.
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6. The wireless device of claim 5, wherein the logic circuitry further includes an analog to digital converter having an input coupled to the second transducer.
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7. The wireless device of claim 2, wherein the wireless device is configured as a wearable headset.
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8. The wireless device of claim 2, further comprising an image sensor configured to capture an image and provide data regarding the image to the logic circuitry.
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9. A wireless communication system comprising:
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a wireless device; and a base station having at least one network connection and an RF transceiver configured to generate an RF signal and communicate with the wireless device using backscatter communication; wherein the wireless device is configured to generate operating power for the wireless device from the RF signal, and is configured to receive an audio signal and communicate data related to the audio signal to the base station using backscatter communication.
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10. The wireless communication system of claim 9, wherein the wireless device further includes:
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logic circuitry configured to process signals within the wireless device; a first transducer configured to generate an audio output signal; a second transducer configured to receive the input audio signal and provide an input analog signal to the logic circuitry; wherein the logic circuitry is further configured to receive data from the RF signal and provide an output analog signal to the first transducer.
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11. The wireless communication system of claim 10, wherein the wireless device includes a first impedance matching transformer coupled between the logic circuitry and the first transducer.
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12. The wireless communication system of claim 11, wherein the wireless device includes a second impedance matching transformer coupled between the second transducer and the logic circuitry.
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13. The wireless communication system of claim 11, wherein the logic circuitry includes a digital to analog converter having an output coupled to the first impedance matching transformer.
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14. The wireless communication system of claim 11, wherein the logic circuitry further includes an analog to digital converter having an input coupled to the second transducer.
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15. The wireless communication system of claim 11, wherein the wireless device is configured as a wearable headset.
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16. The wireless communication system of claim 11, wherein the wireless device further includes an image sensor configured to capture an image and provide data regarding the image to the logic circuitry.
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17. The wireless communication system of claim 9, further comprising a plurality of wireless devices each having a unique address, and each configured to generate operating power from the RF signal, and wherein the base station is configured to receive backscatter communication from each of the plurality of wireless devices.
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18. The wireless communications system of claim 17, wherein the base station is configured to transmit data to each of the wireless devices using the RF signal.
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19. A method of operating a wireless device comprising:
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receiving an RF signal at the wireless device; generating an output data signal derived from the RF signal; converting the output data signal to an output analog signal using a first impedance matching device; deriving DC operating power for the wireless device from the RF signal; and using a first transducer of the wireless device coupled to an output of the impedance matching device to produce an output audio signal based on the output analog signal.
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20. The method of claim 19, further comprising:
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using a second transducer of the wireless device to receive an input audio signal; generating an input data signal based on the input audio signal; and modulating the RF signal based on the input data signal.
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21. The method of claim 20, wherein generating an input data signal includes using a second impedance matching transformer having an input coupled to an output of the second transducer.
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22. The method of claim 19, wherein using a first impedance matching transformer includes configuring a plurality of switches to adjust a turns ratio of the first impedance matching transformer.
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23. The method of claim 20, wherein converting the output data signal to an output analog signal includes using a digital to analog converter coupled to the first impedance matching transformer.
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24. The method of claim 20, wherein generating an input data signal includes using an analog to digital converter coupled to the second transducer.
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25. The method of claim 19, further comprising using an image sensor of the wireless device to capture an image and provide data regarding the image to a source of the RF signal.
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26. A method of providing communication between a wireless device and a base station comprising:
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generating an RF signal from the base station; receiving the RF signal at the wireless device; deriving operating power for the wireless device from the RF signal; receiving an audio input signal at the wireless device; using the wireless device, modulating the RF signal based on the audio input signal to create a modulated RF signal; and receiving the modulated RF signal at the base station.
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27. The method of claim 26, wherein the wireless device includes a first transducer configured to generate an audio output signal and a second transducer configured to receive the audio input signal, and wherein the method further includes receiving data from the RF signal and providing an output signal to the first transducer based on the data received.
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28. The method of claim 27, further comprising using a first impedance matching device at an input of the first transducer.
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29. The method of claim 28, further comprising using a second impedance matching device at an output of the second transducer
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30. The method of claim 28, further comprising converting the output data signal to an output analog signal using a digital to analog converter coupled to the first impedance matching transformer.
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31. The method of claim 26, further comprising using an analog to digital converter coupled to the second transducer.
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32. The method of claim 26, further comprising:
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using an image sensor of the wireless device to capture an image; and providing data regarding the image to the base station.
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33. The method of claim 26, further comprising receiving text data by the wireless device and providing data related to the text data to the base station.
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34. The method of claim 26, further comprising providing a plurality of wireless devices each having a unique address, and each configured to generate operating power from the RF signal, and wherein the method further comprises selecting one of the plurality of wireless devices by the base station using the unique address of the one of the plurality of wireless devices and receiving backscatter communication from the one of the plurality of wireless devices.
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35. The method of claim 26, further transmitting data from the base station to each of the wireless devices using the RF signal.
Specification