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In this paper, a tuning method of a resonant circuit suited for wireless powering of miniature endoscopic capsules is presented anddiscussed. The method allows for an automatic tuning of the resonant frequency and matching impedance of a full wave rectifier loading theresonant circuit. Thereby, the receiver tunes so as to obtain the highest power efficiency under given conditions of transmission. A prototypereceiver for wireless power reception, fabricated in in AMS CMOS 0.35 um technology, was used to verify correct operation of the proposedtuning. The prototype system produces a stable supply voltage, adjustable in the range of 1.2‒1.8 V at a maximum output current of 100‒67 mA,which is sufficient to power a typical endoscopic capsule.

Automatic tuning of a resonant circuit in wireless power supply systems for biomedical sensors