RF-ultrasound relay for efficient power and data transfer across interfaces
A hybrid RF-acoustic relay is provided where some but not all of the incident RF power is rectified to power the relay and, optionally, to provide power for further link features. The remaining fraction of the incident RF power is used to directly drive an acoustic transceiver array in communication with one or more acoustically powered nodes. In this manner, power, control and communication can be efficiently provided to acoustically powered nodes even in situations where an RF link or an acoustic link would perform poorly.
1. Apparatus configured as a hybrid RF-acoustic relay unit, the apparatus comprising:
one or more RF transceivers configured to receive received RF signals from an external RF unit;
one or more acoustic transceivers configured to transmit transmitted acoustic signals to one or more acoustically powered nodes, wherein each of the one or more acoustic transceivers includes at least one acoustic transducer;
a power splitter configured to split incident power provided by the received RF signals into a first part and a second part;
wherein power for the apparatus is provided by rectifying the first part;
wherein the second part is used to directly drive the one or more acoustic transceivers such that an acoustic emission frequency of the one or more acoustic transceivers is the same as an RF frequency of the second part.
2. The apparatus of claim 1 wherein the one or more RF transceivers are configured to transmit transmitted RF signals to the external RF unit.
3. The apparatus of claim 1 wherein the one or more acoustic transceivers are configured to receive received acoustic signals from the one or more acoustically powered nodes.
4. The apparatus of claim 3 , wherein control parameters for control of the apparatus are provided by RF data from the received RF signals and/or by acoustic data from the received acoustic signals.
5. The apparatus of claim 1 , wherein at least one of the one or more acoustic transceivers includes a controllable impedance in series with its acoustic transducer.
6. The apparatus of claim 5 , wherein the controllable impedance is an analog controllable impedance.
7. The apparatus of claim 5 , wherein the controllable impedance includes two or more switches configured to provide digital amplitude and/or phase control.
8. The apparatus of claim 7 , wherein at least one of the one or more acoustic transceivers includes a variable signal generator.
9. The apparatus of claim 8 , wherein the variable signal generator is a digital variable signal generator.
10. The apparatus of claim 1 , wherein control parameters for control of the apparatus are provided as predetermined default parameters.
11. The apparatus of claim 1 , further comprising the external RF unit, wherein the external RF unit is disposed on a wearable device configured to be worn by the patient.
12. The apparatus of claim 1 , wherein the apparatus is configured as a contact lens to be worn on an eye of a patient.
13. The apparatus of claim 12 , wherein the one or more acoustic transceivers are disposed in a ring such that the transmitted acoustic signals substantially do not pass through a lens of the eye of the patient.
14. The apparatus of claim 12 , further comprising the one or more acoustically powered nodes, wherein the one or more acoustically powered nodes are included in a retinal implant.
15. The apparatus of claim 1 , wherein the apparatus is configured to be implanted into a lens of an eye of a patient.
16. The apparatus of claim 1 , wherein the power splitter is configured such that the first part is 60% or less of the incident power provided by the received RF signals.