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设计了一种可应用于超高频无源植入式神经刺激器的模拟前端电路。对无源植入式芯片模拟前端的系统架构进行了论述,简述了前端架构中各个模块的工作原理,通过优化系统结构,减小了系统复杂度和版图面积。模块包括整流电路、电源管理电路、调制解调电路、上电复位电路和时钟产生电路。其中,整流电路工作时,效率可达到45%以上,并且能提供两种不同的工作电压。使用Cadence Spectre对设计电路进行仿真,并通过TSMC 0.35μm BCD工艺进行流片验证。结果显示,该模拟前端的直流功耗为0.06mW,芯片面积为0.4mm~2,可以满足植入式神经刺激器的要求。
An analog front-end circuit designed for UHF passive implanted neurostimulator was designed. The system architecture of passive front-end embedded chip simulation front is discussed. The working principle of each module in front-end architecture is briefly described. By optimizing the system structure, the system complexity and layout area are reduced. The module includes rectifier circuit, power management circuit, modulation and demodulation circuit, power-on reset circuit and clock generation circuit. Among them, the rectifier circuit work, the efficiency can reach more than 45%, and can provide two different operating voltage. The design circuit was simulated using Cadence Specter and verified by the TSMC 0.35μm BCD process. The results show that the DC power consumption of the analog front end is 0.06mW and the chip area is 0.4mm ~ 2, which can meet the requirements of implantable neurostimulator.