34.3 An 8.2mm 3 Implantable Neurostimulator with Magnetoelectric Power and Data Transfer

作者：Zhanghao Yu, Joshua Chen, Benjamin W. Avants, Yan He, Amanda Singer, Jacob T. Robinson, Kaiyuan Yang · 年份：2020 · DOI：10.1109/isscc19947.2020.9062931 · 被引用次数：23 · 研究领域：Perovskite Materials and Applications、Wireless Power Transfer Systems、Advanced Memory and Neural Computing

Modulating the electrical activity in the nervous system has shown great potential for neuroscience research and clinical therapies. To reduce risks of infection and restrictions in subject mobility, neuromodulators must be miniaturized and untethered. Safe and reliable wireless power transfer and data delivery with the required size and power constraints is still one of the fundamental challenges in developing miniature neural interfaces. A few wireless neural implants powered by RF, inductive coupling [1]-[3], ultrasound [4], and optics [5] have been reported; however, existing solutions cannot simultaneously achieve implant miniaturization, system portability, functional flexibility, and subject mobility, while avoiding tissue heating due to body absorption of high-frequency EM waves [6], attenuation of mechanical waves crossing different mediums [7], limited penetration depth of light [5], or lack of controllability with magnetothermal nanoparticles [8]. In comparison, magnetoelectric (ME) transducers, which convert low-frequency (100kHz to 10MHz) AC magnetic fields into electrical energy via mechanical coupling between magnetostrictive and piezoelectric films (Fig. 34.3.1, top), are promising for powering biomedical implants by offering all the desired properties summarized in Fig. 34.3.1. At resonance, lead zirconate titanate (PZT)/Metglas-based ME films generate high output voltage with low resistive source impedance (~8000), under a magnetic field of less than 1mT, ma...