C. Brendler, Naser Pour Aryan, V. Rieger, S. Klinger, A. Rothermel
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Power control by magnetic field diminishment in inductively powered biomedical implants
A power control circuit by magnetic field diminish-ment in inductively powered biomedical implants is presented. Due to large and fast coupling variations in inductively powered retinal implants caused by the eye movements, excessive power has to be controlled. This proposal attenuates the magnetic field in the secondary coil to reduce received power. Coil shorting is realized by applying short enough pulses to enable a parallel ASK data transmission. The system was fabricated and measured using a 350 nm BiCMOS High Voltage technology. Measurement results show a reduction of the thermal power generated by the implant.