3.2 mW ultrasonic LSK modulator for uplink communication in deep implanted medical devices

The wireless body area network (WBAN) includes up to ten sensor nodes and an external control unit to synchronize the wireless power transfer and communication. A battery operated sensor node is designed using discrete components and tested on standard FR4 substrate. The board dimensions are 2.7 × 4.9 cm
²
which fits inside the Kinetra neurostimulator casing provided by Medtronic, wherein a six elements array transducer (5 × 10 mm
²
) is glued. The transponder power consumption is 3.2 mW when transmitting data towards the control unit, and only 49 μW when in sleep mode.