RF telemetry for an active medical device such as an implant or programmer for an implant
RF telemetry for an active medical device such as active implant or programmer for such implant. The device includes at least one RF antenna ( 14 ), and at least one RF telemetry transmitter/receiver ( 44 ) with, for coupling to the antenna, an associated band rejection filter ( 54 ). The band rejection filter ( 54 ) comprises at least one volume acoustic wave BAW resonator ( 40 ) of the SMR type with insulation by Bragg acoustic reflector ( 42 ). The device can be a multi-band device comprising a plurality of RF transmitters/receivers ( 12, 44 ) operating in respective distinct bands of frequencies such as the 402˜405-MHz, 863˜870-MHz, 902˜928-MHz and 2.4-GHz bands or by UWB transmission.
1. An active medical device, comprising:
an RF antenna,
a first RF telemetry transmitter/receiver having a first band rejection filter for coupling to the RF antenna, wherein the first RF telemetry transmitter/receiver operates in a first frequency band and wherein said first band rejection filler includes a volume acoustic waves BAW resonator of the SMR type with Bragg reflector insulation,
a second RF telemetry transmitter/receiver having a second band rejection filter for coupling to the RF antenna, wherein the second RF telemetry transmitter/receiver operates in a second frequency band, and
means for selecting, for RF communication, a frequency band of the first frequency band and the second frequency band,
wherein the first RF telemetry transmitter/receiver and the second RF telemetry transmitter/receiver operate in at least two frequency bands selected from among the frequency bands of 401-402 MHz, 402-405 MHz, 405-406 MHz, 863-870 MHz, 902-928 MHz and 2.4 GHz or by a transmission of the UWB type.
2. The device of claim 1 , wherein the RF antenna is common to the first RF telemetry transmitter/receiver and the second RF telemetry transmitter/receiver and coupled therewith through the first band rejection filter and the second band rejection filter and impedance matching elements.
3. The device of claim 1 further comprising means for evaluating performance of the first frequency band and the second frequency band, wherein the means for selecting selects the frequency band presenting the best performance.
4. The device of claim 1 further comprising:
a hybrid circuit board and a chip, bonded on said board, of a monolithic circuit integrating said first RF telemetry transmitter/receiver, wherein the volume acoustic waves BAW resonator is directly integrated to the chip on a surface of the chip.
5. The device of claim 1 further comprising:
a hybrid circuit board and a chip, bonded on said board, of a monolithic circuit integrating said first RF telemetry transmitter/receiver, wherein the volume acoustic waves BAW resonator is a discrete component, distinct from the chip and bonded on a surface of the chip.
6. The device of claim 5 wherein the volume acoustic waves BAW resonator is bonded on the surface of the chip through a flip-chip technique.
7. The device of claim 5 wherein the volume acoustic waves BAW resonator is bonded on the surface of the chip by a wire-bonding technique.
8. The device of claim 1 further comprising:
a hybrid circuit board and a chip, bonded on said board, of a monolithic circuit integrating said first RF telemetry transmitter/receiver, wherein the volume acoustic waves BAW resonator is a discrete component, distinct from the chip and bonded on a surface of the hybrid circuit board.
9. The device of claim 1 , wherein the volume acoustic waves BAW resonator is a tunable resonator comprising an erodable superficial charge layer.
10. The device of claim 1 , wherein the first band rejection filter is a filter having a differential input and an output comprising a plurality of volume acoustic waves BAW resonators in a mesh configuration.
11. The device of claim 1 , wherein the first band rejection filter is a filter having an asymmetric input and an output comprising a plurality of volume acoustic waves BAW resonators in a ladder configuration.
12. An active medical device, comprising:
an RF antenna,
a first RF telemetry transmitter/receiver having a first band rejection filter for coupling to the RF antenna, wherein the first RF telemetry transmitter/receiver operates in a first frequency band and wherein said first band rejection filter includes a volume acoustic waves BAW resonator of the SMR type with Bragg reflector insulation,
a second RF telemetry transmitter/receiver having a second band rejection filter for coupling to the RF antenna, wherein the second RF telemetry transmitter/receiver operates in a second frequency band,
means for selecting, for RF communication, a frequency band of the first frequency band and the second frequency band,
means for evaluating performance of the first frequency band and the second frequency band, wherein the means for selecting selects the frequency band presenting the best performance, and
means for commuting the transmitter/receiver operating within the band that was not selected towards a low power consumption mode.