A 0.13µm CMOS integrated wireless power receiver for biomedical applications

This paper presents a fully integrated 2.2×2.2mm², wireless power transfer (WPT) receiver in 0.13μm CMOS without any external components or post-processing steps. The on-chip receiver coil (Rx) demonstrates a peak measured WPT efficiency of -18.47dB, -20.96dB and -20.13dB at 10mm of separation through air, bovine muscle and 0.2molar NaCl, respectively. Fully integrating the large receiver coil along with supporting circuits introduces new challenges that are addressed in this paper. The receiver employs a synchronous adaptive matching network that guarantees the maximum achievable efficiency for a given resistive load. The proposed WPT rectifier uses feedback to avoid plasma-induced gate-oxide damage and a new dual-supply regulator architecture to achieve high power supply rejection ratio (PSRR) without utilizing any large off-chip capacitors.