无线能量管理芯片的研究与设计

发布时间：2018-04-03 01:29

  本文选题：植入式医疗芯片　切入点：无线能量　出处：《杭州电子科技大学》2017年硕士论文

【摘要】：近几年,随着对植入式医疗芯片研究的不断深入,生物信号频段低噪声放大器、低噪声低功耗数模转换器等处理模块已经获得了较大的突破。除了这些研究领域,另一个重要的课题就是无线能量的传输与处理,它的目的是为了解决电池更换与有线传输带来操作上的难度。通过天线采集无线电磁波能量,将其转化为直流电源,实现芯片的可持续性工作。本文对无线能量管理芯片中的相关模块进行研究和设计,实现集成度较高、系统功能较完善的无线能量管理芯片,完成无线能量的转换与管理,从而给负载电路提供高性能的电源电压。论文所设计的无线能量管理芯片主要包括电荷泵整流器(Charge Pump Rectifier,REC)、带隙基准电压源(Bandgap Voltage Reference,BGR)、低压差线性稳压器(Low Dropout Regulator,LDO)。针对REC的研究与设计,论文首先分析它与天线之间的等效电路,得出输入信号摆幅与输入带宽之间的折衷关系;再利用电荷守恒原理对REC进行设计流程的总结,并基于本征MOS管实现高效率的整流器。针对BGR的研究与设计,论文对基于亚阈值区MOS管与BJT相结合的改进型结构展开分析,解释了决定工艺稳定度的关键因素并提出相应的提高电源抑制能力的措施。针对LDO的研究与设计,论文分别对LDO和开关稳压器的工作原理进行分析,并详细介绍了LDO中的关断、过压保护、过流保护、过温保护等辅助电路,在此基础上设计环路稳定、高电源抑制比的LDO。论文采用SMIC 0.18μm CMOS工艺对上述各模块和整个无线能量管理芯片进行了电路的设计仿真、版图设计与验证。版图后仿真结果表明,REC整流效率达到60%,改进型BGR静态电流仅为650nA,电源抑制为-60dB@DC、-50dB@500MHz,工艺稳定度在1%。LDO的静态电流为5μA,当最大负载电流为15μA时,效率为66.7%。在空载时电源抑制为-100dB@DC、-50dB@500MHz,在满载时为-55dB@DC、-50dB@500MHz。另外,在温度超过70℃、负载电流超过30μA、输入电压超过2.2V时均能关断电路,实现电路的自我保护。基于以上三个模块设计整个无线能量管理芯片,仿真表明,对应于不同的输入电压,LDO输入电压均能限制在1.8V-2V的安全工作区域,并且将输出纹波降到输出电压的1%以下,实现了低噪声、低纹波的高性能输出。同时,芯片在温度为70℃、负载电流超过30μA时,均能关断芯片实现保护。
[Abstract]:In recent years, with the development of implantable medical chip, the processing modules such as low noise amplifier and low noise digital-to-analog converter in the frequency band of biological signal have made a great breakthrough.In addition to these research areas, another important issue is wireless energy transmission and processing, which aims to solve the operational difficulties caused by battery replacement and wired transmission.The wireless electromagnetic wave energy is collected by antenna and converted into DC power source to realize the sustainable operation of the chip.This paper studies and designs the related modules in the wireless energy management chip, realizes the wireless energy management chip with high integration and perfect system function, and completes the conversion and management of wireless energy.Thus provides high performance power supply voltage to the load circuit.The wireless energy management chip designed in this paper mainly includes charge Pump Rectifier, Bandgap Voltage reference, low Dropout regulator.Aiming at the research and design of REC, the equivalent circuit between REC and antenna is analyzed firstly, and the tradeoff between input signal swing and input bandwidth is obtained, and then the design flow of REC is summarized by using the principle of charge conservation.A high efficiency rectifier is realized based on intrinsic MOS transistor.In view of the research and design of BGR, this paper analyzes the improved structure based on the combination of MOS tube and BJT in sub-threshold region, explains the key factors that determine the process stability, and puts forward the corresponding measures to improve the power supply suppression ability.Aiming at the research and design of LDO, the paper analyzes the working principle of LDO and switching regulator, and introduces in detail the auxiliary circuits in LDO, such as turn-off, overvoltage protection, over-current protection, over-temperature protection, etc. On this basis, the loop stability is designed.High power rejection ratio of LDO.In this paper, SMIC 0.18 渭 m CMOS process is used to simulate the circuit design, layout design and verification of the above modules and the whole wireless energy management chip.鐗堝浘鍚庝豢鐪熺粨鏋滆〃鏄，

本文编号：1703032