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超小面积超低功耗9位模数转换器

南京邮电大学学报（自然科学版） 2024年第1期44卷 13-19页

作者：马源王学诚张沕琳清华大学电子工程系北京100084

设计了一种40 nm CMOS技术下的9位差分逐次逼近式(SAR)模数转换器(ADC)。通过理论推导计算电容器失配误差和寄生效应的影响,结合MATLAB软件特点建立了快速蒙特卡洛仿真模型,模型可根据ADC各项关键参数约束,实现多结构性能比较算法。根... 详细信息

设计了一种40 nm CMOS技术下的9位差分逐次逼近式(SAR)模数转换器(ADC)。通过理论推导计算电容器失配误差和寄生效应的影响,结合MATLAB软件特点建立了快速蒙特卡洛仿真模型,模型可根据ADC各项关键参数约束,实现多结构性能比较算法。根据工艺参数和版图提取信息,将实际参数代回仿真模型进行快速验证,极大降低了架构调整带来的迭代成本。最终实现的ADC硅片面积仅为0.0043 mm^(2),在125 kS/s采样率下测得的功耗开销仅为360 nW,对于2.6 kHz的1.8 Vpp输入信号实现了8.4 bit的有效位数(ENoB)和68.8 dB的无杂散动态范围(SFDR)。

关键词：模数转换器逐次逼近式超低功耗生物传感系统

Electrochemical codeposition of typical α+β phases Mg-Li alloys from the molten LiCl-KCl-MgCl_2 system

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Rare Metals 2010年第2期29卷 198-203页

作者： YE Ke CHEN Ye zhang milin Key Laboratory of the Ministry of Education for Superlight Materials ＆ Surface Technology College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China

Electrochemical codeposition of Mg-Li alloys on molybdenum electrodes was investigated in LiCl-KCl（50 wt.%：50 wt.%） melts containing different concentrations of MgCl2 at 973 *** voltammograms show that the underpotential deposition of lithium on pre-deposited magnesium leads to the formation of liquid Mg-Li *** deposition potentials of Mg（II） and Li（I） ions gradually near each other with MgCl2 concentration ***-Li alloys with typical α ＋ β phases could be obtained by potentiostatic electrolysis from LiCl-KCl melts containing 5 wt.% MgCl2 at -2.25 V ***/AgCl（cathodic current density 1.70 A·cm-2） for 2.5 h.α phase, α ＋ β phases, and β phase Mg-Li alloys with different lithium contents were obtained by potentiostatic electrolysis from LiCl-KCl melts with the different concentrations of *** samples were characterized by X-ray diffraction and scanning electron microscopy.

关键词： physical chemistry Mg-Li alloys electrochemical codeposition molten salt electrolysis

Mathematical analysis and its experimental comparisons for the accumulative roll bonding(ARB)process with different superimposed layers

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Journal of Magnesium and Alloys 2021年第5期9卷 1761-1772页

作者： Haipeng Zheng Ruizhi Wu Legan Hou Jinghuai zhang milin zhang Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationHarbin Engineering UniversityNo.145 Nantong Street Nangang DistrictHarbin 150001China College of Science Heihe UniversityHeihe 164300PR China

Based on the traditional two-layer accumulative roll bonding(TARB),the geometrical variations and mathematical relationship during the four-layer accumulative roll bonding(FARB)were derived and ***,the multi-layer accumulative roll bonding(MARB)technology was proposed and the geometrical variations and mathematical relationship of MARB were simultaneously derived and ***,Mg-14Li-3Al-2Gd(LAGd1432)sheets were fabricated by TARB and FARB,*** with the TARB,the FARB has a higher accumulative efficiency in terms of accumulative layers,total number of interfaces,interface spacing,total deformation and equivalent ***,the FARB-processed sheets in lower cycles have the similar microstructure and mechanical properties of the TARB-processed sheets in higher *** addition,FARB process can further break through the deformation limit of TARB process in a single cycle through adopting two-step rolling in one cycle with 50%deformation in one pass and 75%accumulative deformation in one cycle,which can effectively solve the problem of poor interface bonding of the latest interface brought by the last cycle,and thus significantly improve the phenomenon of unstable performance of the ARB-processed sheets.

关键词： ARB Mathematical relationship Equivalent strain Strengthening mechanism

Relationship between equilibrium potential and radius of lanthanides electrolyzed on the zinc cathode

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Chinese Journal of Chemical Engineering 2019年第12期27卷 3027-3035页

作者： Peng Li milin zhang Debin Ji Min Qiu Li Liu Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China College of Science Heihe UniversityHeihe 164300China

The electrochemical behavior of lanthanide elements deposited on liquid zinc cathodes was studied using cyclic voltammetry(CV)and open circuit chronopotentiometry(OCP).We observed a"bimodal effect"in the equilibrium deposition potentials of zinc with lanthanides.A mathematic equation is derived to illustrate the relationship between the equilibrium potential of the intermetallic compounds formed by lanthanide elements and zinc and their atomic *** equation is not only applicable to lanthanide elements but also hold for other elements such as alkali metal lithium,alkaline earth metal magnesium,calcium and transition metal niobium,which have crucial theoretical significance for the electrolysis of intermetallic compounds,the separation,and extraction of metals.

关键词： Equilibrium Potential Electrolysis Molten salts Mathematical Grading rule Reduction

Effect of Y and Ce on the microstructure, mechanical properties and anisotropy of as-rolled Mg-8Li-1Al alloy

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Journal of Materials Science & Technology 2020年第4期39卷 124-134页

作者： Feng Zhong Huajie Wu Yunlei Jiao Ruizhi Wu Jinghuai zhang Legan Hou milin zhang Key Laboratory of Superlight Material and Surface Technology(Harbin Engineering University) Ministry of EducationHarbin 150001China College of Science Heihe UniversityHeihe UniversityHeihe 164300China Tianjin Institute of Aerospace Mechanical and Electrical Equipment Tianjin 300301China

The effects of combined addition of Y and Ce on the microstructure,mechanical properties and anisotropy of as-rolled Mg-8 Li-1 Al(LA81)alloy were *** combined addition of Y and Ce improves the mechanical properties with a low plasticity loss by solution strengthening,dispersion strengthening,grain refinement ***-8 Li-1 Al-0.6 Y-0.6 Ce(LA81-0.6 Y-0.6 Ce)has better mechanical properties and shows an almost *** possesses an ultimate tensile strength of 278.7 MPa and an elongation of 15.0%.Compared to LA81 alloy,the ultimate tensile strength increases by about 17.6%with an elongation reduction of only 3.5%,and a good isotropy of ultimate tensile strength and elongation(the value of ravg is near 1).

关键词： Mg-Li alloy Cross rolling Alloying Mechanical properties Anisotropy

New preparation of Mg-Li-Al alloys by electrolysis in molten salt

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Acta Metallurgica Sinica(English Letters) 2010年第2期23卷 129-136页

作者： Wei HAN Qiong CHEN Ke YE Yongde YAN milin zhang Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of MaterialScience and chemical Engineering Harbin Engineering University Harbin 150001 China

This work presents a study on electrochemical formation of Mg-Li-Al alloys on an inert electrode （Mo electrode） in a molten KCl-LiCl-AlC13-MgCI2-KF system. It aims at preparation Mg-Li-Al metal alloy directly under an optimal electrolytic parameters. Main factors which affect current efficiency are investigated. We have discussed the co-electrodeposition conditions and the effect of technical parameters on these experiments, and gained a good electrolytic process. The result of calculation shows that co-electrodeposition Mg, Li and A1 occurs at the cathode current density higher than 9 A/cm^2 and electrolytic voltage between 6 to 9 V. And at the optimal parameters, 12-13 A/cm^2, 620-640 ℃, the highest current efficiency reaches as high as 86%. Lithium combined with magnesium forms Li0.92Mg4.0s and LiaMg7, and aluminum mainly exists in a form of Mg0.58Al0.42, distributing in the alpha phases and beta phases.

关键词： Mg-Li-Al Molten salts Co-electrodeposition Electrolysis

Enhanced Electromagnetic Interference Shielding in a Duplex-Phase Mg-9Li-3Al-1Zn Alloy Processed by Accumulative Roll Bonding

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Acta Metallurgica Sinica(English Letters) 2020年第4期33卷 490-499页

作者： Jiahao Wang Lin Xu Ruizhi Wu Jing Feng Jinghuai zhang Legan Hou milin zhang Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001China College of Science Heihe UniversityHeihe 164300China

High electromagnetic shielding performance was achieved in the Mg-9Li-3Al-1Zn alloy processed by accumulative roll bonding(ARB).The microstructure,electromagnetic interference shielding effectiveness(SE) in the frequency of 30-1500 MHz and mechanical properties of the alloy were investigated.A model based on the shielding of the electromagnetic plane wave was used to theoretically discuss the EMI shielding mechanisms of ARB-processed *** indicate that the SE of the material increases gradually with the increase in the ARB *** enhanced SE can be attributed to the obvious microstructure orientation caused by ARB,and the alternative arrangement of alpha(Mg) phase and beta(Li)*** addition,with the increase in ARB pass,the number of interfaces between layers increases and the grain orientation of each layer tends to alignment along c-axis,which is beneficial to the reflection loss and multiple reflection loss of the incident electromagnetic wave.

关键词： Accumulative roll bonding(ARB) Mg-Li alloy Dual-phase alloys Electromagnetic interference Reflection loss

Preparation of ternary Mg-Li-Sn alloys from molten salt by electrolysis

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Acta Metallurgica Sinica(English Letters) 2012年第4期25卷 265-271页

作者： Peng CAO milin zhang Wei HAN Yongde YAN Lijun CHEN Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of MaterialsScience and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China

Electrochemical behavior of Mg, Li and Sn on tungsten electrodes in LiC1-KC1-MgCI2- SnC12 melts at 873 K was investigated. Cyclic voltammograms （CVs） showed that the underpotential deposition （UPD） of magnesium on pre-deposited tin leads to the formation of a Mg-Sn alloy, and the succeeding underpotential deposition of lithium on pre-deposited Mg-Sn alloy leads to the formation of a Mg-Li-Sn alloy. Chronopo- tentiometric measurements indicated that the codepositon of Mg, Li and Sn occurs at current densities more negative than -1.16 ***-~. X-ray diffraction （XRD） in- dicated that Mg2Sn phase is formed via galvanostatic electrolysis. The element Mg distributes homogeneously and Sn locates mainly on the grain boundaries in the Mg- Li-Sn alloy.

关键词： Mg-Li-Sn alloy Molten salt Cyclic voltammetry Electrolysis

Micro-arc oxidation coatings on Mg-Li alloys

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Rare Metals 2009年第2期28卷 160-163页

作者： Xu Yongjun Li Kang Yao Zhongping Jiang Zhaohua zhang milin Harbin Inst Technol Dept Appl Chem Harbin 150001 Peoples R China Harbin Engn Univ Key Lab Minist Educ Super Light Mat & Surface Technol Harbin 150001 Peoples R China

Micro-arc oxidation (MAO) method was used for the surface modification of an Mg-5wt.%Li alloy. Ceramic coatings were in-situ fabricated on the Mg-Li alloy. The morphology feature,phase composition,and corrosion-resistance of the formed ceramic coatings were studied by SEM,XRD,and electrochemical methods,respectively. The results showed that the coatings produced in a sodium silicate solution system were composed of MgO and Mg2SiO4. The ceramic coating became thicker and the content of Mg2SiO4 phase increase...

关键词： Mg-Li alloys ceramic coatings micro-arc oxidation corrosion resistance