Fully Integrated Ultrasound Power Receiver for Multi-Piezo Implants with Random Phase Offset
L. Subbaiah Kumar Nangaru (TU Delft - Bio-Electronics)
S. Du (TU Delft - Electronic Instrumentation)
D.G. Muratore (TU Delft - Bio-Electronics)
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Abstract
A single transmitter source can power multiple ultrasound piezoelectric transducers to enhance the harvested power; however, the received ultrasonic signals vary in phase and amplitude across each element. This paper introduces a fully integrated, high-frequency SSHC rectifier tailored for miniaturized multi-piezo implants to efficiently harvest power at variable phase offsets with a compact form factor. The design incorporates a novel phase-splicing flipping capacitor-sharing technique between all four ultrasound piezoelectric transducers to improve area efficiency. The proposed 4-stage SSHC rectifier can harvest 5.94x more power than a full bridge rectifier operating at a high ultrasonic excitation frequency of 780 kHz. The proposed system was designed using 180-nm BCD process technology for a 2x2 piezoelectric transducer array, with each element featuring an internal capacitor (CP) of 63.7pF.