發(fā)布時間：2018-04-03 01:29

  本文選題：植入式醫(yī)療芯片　切入點：無線能量　出處：《杭州電子科技大學》2017年碩士論文

【摘要】：近幾年,隨著對植入式醫(yī)療芯片研究的不斷深入,生物信號頻段低噪聲放大器、低噪聲低功耗數(shù)模轉(zhuǎn)換器等處理模塊已經(jīng)獲得了較大的突破。除了這些研究領(lǐng)域,另一個重要的課題就是無線能量的傳輸與處理,它的目的是為了解決電池更換與有線傳輸帶來操作上的難度。通過天線采集無線電磁波能量,將其轉(zhuǎn)化為直流電源,實現(xiàn)芯片的可持續(xù)性工作。本文對無線能量管理芯片中的相關(guān)模塊進行研究和設(shè)計,實現(xiàn)集成度較高、系統(tǒng)功能較完善的無線能量管理芯片,完成無線能量的轉(zhuǎn)換與管理,從而給負載電路提供高性能的電源電壓。論文所設(shè)計的無線能量管理芯片主要包括電荷泵整流器(Charge Pump Rectifier,REC)、帶隙基準電壓源(Bandgap Voltage Reference,BGR)、低壓差線性穩(wěn)壓器(Low Dropout Regulator,LDO)。針對REC的研究與設(shè)計,論文首先分析它與天線之間的等效電路,得出輸入信號擺幅與輸入帶寬之間的折衷關(guān)系;再利用電荷守恒原理對REC進行設(shè)計流程的總結(jié),并基于本征MOS管實現(xiàn)高效率的整流器。針對BGR的研究與設(shè)計,論文對基于亞閾值區(qū)MOS管與BJT相結(jié)合的改進型結(jié)構(gòu)展開分析,解釋了決定工藝穩(wěn)定度的關(guān)鍵因素并提出相應的提高電源抑制能力的措施。針對LDO的研究與設(shè)計,論文分別對LDO和開關(guān)穩(wěn)壓器的工作原理進行分析,并詳細介紹了LDO中的關(guān)斷、過壓保護、過流保護、過溫保護等輔助電路,在此基礎(chǔ)上設(shè)計環(huán)路穩(wěn)定、高電源抑制比的LDO。論文采用SMIC 0.18μm CMOS工藝對上述各模塊和整個無線能量管理芯片進行了電路的設(shè)計仿真、版圖設(shè)計與驗證。版圖后仿真結(jié)果表明,REC整流效率達到60%,改進型BGR靜態(tài)電流僅為650nA,電源抑制為-60dB@DC、-50dB@500MHz,工藝穩(wěn)定度在1%。LDO的靜態(tài)電流為5μA,當最大負載電流為15μA時,效率為66.7%。在空載時電源抑制為-100dB@DC、-50dB@500MHz,在滿載時為-55dB@DC、-50dB@500MHz。另外,在溫度超過70℃、負載電流超過30μA、輸入電壓超過2.2V時均能關(guān)斷電路,實現(xiàn)電路的自我保護�；谝陨先齻�模塊設(shè)計整個無線能量管理芯片,仿真表明,對應于不同的輸入電壓,LDO輸入電壓均能限制在1.8V-2V的安全工作區(qū)域,并且將輸出紋波降到輸出電壓的1%以下,實現(xiàn)了低噪聲、低紋波的高性能輸出。同時,芯片在溫度為70℃、負載電流超過30μA時,均能關(guān)斷芯片實現(xiàn)保護。
[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，

本文編號：1703032