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A 1-10-MHz Frequency-Aware CMOS Active Rectifier With Dual-Loop Adaptive Delay Compensation and >230-mW Output Power for Capacitively Powered Biomedical Implants
IEEE Journal of Solid-State Circuits ( IF 5.4 ) Pub Date : 2020-03-01 , DOI: 10.1109/jssc.2019.2956883
Reza Erfani , Fatemeh Marefat , Sudip Nag , Pedram Mohseni

This article presents a novel CMOS active rectifier for the emerging modality of capacitive wireless power transfer to biomedical implants with high power budgets. For operation versatility in terms of the input frequency, output power level, input voltage range, and load value, dual-loop adaptive delay compensation is utilized to provide both high resolution and high dynamic range in switched-offset currents of comparators that can be reconfigured for low- and high-speed operation modes for automatic adaptation to the input frequency. Fabricated in 0.18 $\mu \text{m}$ 1P/6M CMOS, the rectifier features power conversion efficiency (PCE) of >84.4% (peak of 91.5%) and voltage conversion ratio (VCR) of >88.6% (peak of 95.1%) when operating in 1–10 MHz and driving a load of 300 $\Omega $ . Moreover, for a load range of 20 $\Omega $ –1 $\text{k}\Omega $ at 5 MHz, PCE of 81%–91.8% and VCR of 78.4%–95.4% are achieved, with a maximum output power of ~232 mW at 50 $\Omega $ with a PCE of 90.1%. The active rectifier is also interfaced with a series-resonant capacitive link formed with coated flexible copper plates around a 3-mm-thick layer of muscle tissue, demonstrating an end-to-end power transfer efficiency of >40% in 2–10 MHz and with a load of 300 $\Omega $ .

中文翻译:

具有双回路自适应延迟补偿和 >230mW 输出功率的 1-10MHz 频率感知 CMOS 有源整流器,用于电容供电的生物医学植入物

本文介绍了一种新型 CMOS 有源整流器,用于将电容式无线电能传输到具有高功率预算的生物医学植入物的新兴模式。为了在输入频率、输出功率电平、输入电压范围和负载值方面的操作多功能性,利用双环自适应延迟补偿来提供可重新配置的比较器开关偏移电流的高分辨率和高动态范围用于自动适应输入频率的低速和高速运行模式。制作于 0.18 $\mu \text{m}$ 1P/6M CMOS,整流器具有>84.4%(峰值为91.5%)的功率转换效率(PCE)和>88.6%(峰值为95.1%)的电压转换率(VCR),当工作在1-10 MHz和驱动时负载 300 $\欧米茄 $ . 此外,对于 20 $\欧米茄 $ –1 $\text{k}\Omega $ 在 5 MHz 时,实现了 81%–91.8% 的 PCE 和 78.4%–95.4% 的 VCR,在 50 时最大输出功率约为 232 mW $\欧米茄 $ PCE 为 90.1%。有源整流器还与串联谐振电容性链路连接,该链路由围绕 3 毫米厚肌肉组织层的涂层柔性铜板形成,在 2–10 MHz 内展示了 >40% 的端到端功率传输效率并且负载为 300 $\欧米茄 $ .
更新日期:2020-03-01
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