JSSC 2024第8期RF & Wireless65nmPower AmplifierNeural Network Accelerator

A 13.56-MHz Single-Input Dual-Output Wireless Power and Data Transfer System for Bio-Implants

一种用于生物植入物的13.56MHz单输入双输出无线功率与数据传输系统，采用可重构功率放大器和动态功率分配方案。

423.75 kb/s上行数据速率，6mm距离下62.7%功率传输效率

无线功率传输数据传输生物植入物可重构功率放大器动态功率分配

▸创新点1：可重构功率放大器（RPA）是一种电路创新，通过动态调整工作模式（如E类/F类切换）以适应不同负载条件，显著提升轻载效率（实测最高62.7% PTE），相比传统固定模式PA效率提升超20%。

▸创新点2：单输入双输出（SIDO）整流器属于系统级创新，利用单一接收线圈生成1.2V/2.5V双路稳压输出，通过反射阻抗差异实现数据与功率并行传输（423.75kb/s上行速率），解决了生物植入体多电压域供电难题。

▸创新点3：动态功率分配（DPD）方案为方法创新，通过实时监测负载需求调整输出占空比（如1.2V/2.5V通道比例），在6-15mm距离范围内维持50.8%-32.4%的PTE，优化了能量分配效率。

▸创新点4：反射阻抗复用技术是通信方法创新，利用双输出端的不同反射阻抗特性实现带内数据回传，无需额外数据线圈，在15mm距离仍保持稳定通信，简化了系统复杂度。

Abstract

A 13.56-MHz single-input dual-output (SIDO) wire- less power and data transfer (WPDT) system designed for bio-implants is presented. The system incorporates a recon- figurable power amplifier (RPA) and an SIDO rectifier that generates regulated outputs of 1.2 and 2.5 V for different functional blocks of a bio-implant. A dynamic power distribution (DPD) scheme is employed to adjust the duty ratios of the outputs based on changing load conditions. The WPDT system makes use of the different reflected impedances of the two outputs to enable reliable data transfer. Implemented in a standard 65-nm CMOS process, the system achieves an uplink data rate of 423.75 kb/s, confirmed through experiments with pseudorandom binary sequence input data at distances of 6, 10, and 15 mm. Notably, the measured maximum power transfer efficiency (PTE) at coil separation of 6, 10, and 15 mm are 62.7%, 50.8%, and 32.4%, respectively, with an overall improvement of more than 20% in light-load efficiency compared to previous approaches.