隔离可修调低功耗基准电压源

介绍了一种新型的可修调低功耗基准电压源。为适应低功耗集成电路应用,该设计采用共源共栅结构代替传统的放大器结构,使基准电压源的功耗大大降低;为克服由模拟集成电路设计工艺波动而导致的电阻值不精确的问题,该设计引入了电阻修调电路,使该基准电压源在各个工艺角下都能有很好的基准电压输出。同时,隔离式的电阻修调改善了传统的直接熔丝修调带来的噪声影响。在SMIC 0.18μm 3.3V标准CMOS工艺下应用spectre仿真,结果表明,温度变化范围为-40℃~100℃时,温度变化1℃,电压变化量为十万分之一,室温下的参考电压输出为1.22V,3.3V电源电压下的功耗约为3.6μW。该基准电压结构适用于低功耗集成电路设计。     

低电压、低功耗CMOS基准电压源的设计

为了有效降低模拟集成电路的功耗,提高工艺兼容性,文中提出了一种全CMOS结构的低电压、低功耗基准电压源的设计方法.该方法基于工作在亚阈值区的MOS管,利用PTAT电流源与微功耗运算放大器构成负反馈系统以提高电源电压抑制比.仿真结果表明:在1.0V的电源电压下,输出基准电压为609.mV,温度系数为46×10-6/K,静态工作电流仅为1.23μA;在1.0～5.0V的电源电压变化范围内,电压灵敏度为130μV/V,低频电源电压抑制比为74.0dB.由于使用了无寄生双极型晶体管的全CMOS结构,该电路具有良好的CMOS工艺兼容性.     

2.5V 19-ppm/℃的带隙基准电压源设计

论文在分析传统带隙基准源的基础上,设计了低电压输出的带隙基准电压源电路.采用Charter 0.35μm标准CMOS工艺,并用Mentor Graphics公司的Eldo仿真器对带隙基准电压源电路的电源特性、温度特性进行了仿真.该带隙基准电压源的温度系数为19-ppm/℃,在室温下当电源电压2.0~3.0 V时,基准电压源输出电压为(915.4±0.15)mV,功耗小于0.2-mW.     

微波辐射计特性指标测试系统

以微波辐射计特性指标的基本定义为依据，提出了微波辐射计特性指标的测试系统及测试方法．该系统通过Ａ／Ｄ转换器将数据直接送入计算机，对测试过程及测试数据进行自动处理，并直接输出最终结果．运行结果表明，这套测试系统能有效地进行微波辐射计特性指标（定标方程和灵敏度，线性度和动态范围，积分时间，稳定性）的测试，它节省人力、时间，具有较高的可靠性．     

微波辐射计特性指标测试系统

以微波辐射计特性指标的基本定义为依据，提出了微波辐射计特性指标的测试系统及测试方法。该系统通过Ａ／Ｄ转换器将数据直接送入计算机，对测试过程及测试数据进行自动处理，并直接输出最终结果。运行结果表明，这套测试系统能有效地进行微波辐射计特性指标（定标方程和灵敏度，线性度和动态范围，积分时间，稳定性）的测试，它节省人力、时间、具有较高的可靠性。     

一种应用于高速高精度流水线ADC的差分参考电压源

介绍了一种应用于高速高精度流水线模数转换器的输出电压可调参考电压源.该参考电压源由电压产生电路和驱动电路组成,具有良好的灵活性,输出的差分参考电压的幅度差和共模电平可以通过输入基准电压和输出共模电压加以调整与控制,可以输出精度高,稳定性好的参考电压,已成功应用于14-bit 100 MS/s的流水线型模数转换器.该参考电压源采用SMIC 0.18μm 1P6M CMOS工艺实现,版图面积为511μm×440μm,功耗为36 mW.测试结果显示,在25.1 MHz的输入频率下,应用该参考电压源的14-bit 100 MS/s流水线ADC的信噪失真比为70.2 dB,无杂散动态范围为86.2 dB.     

宇宙温度计——微波辐射计

任何具有非绝对零度温度的物体都会辐射电磁波,这种天然辐射被称为热辐射。热辐射覆盖了所有波长,其中包括无线电波波段。为了测量热辐射,可以利用灵敏的辐射计。微波辐射计微波辐射计本身是“近视的”,它们只能感受直接靠近“输入端”物体的热辐射。只有在辐射计输入端     

一种超低功耗的低电压全金属氧化物半导体基准电压源

针对传统带隙基准电源电压高、功耗高和面积大的问题,提出了一种超低功耗的低电压全金属氧化物半导体(MOS)基准电压源。该基准源通过电压钳制使MOS管工作在深亚阈值区,利用亚阈值区MOS管的阈值电压差补偿热电势的温度特性,同时采用负反馈提高了电压源的线性度与电源抑制比。整个电压源电路采用SMIC 0.18μm互补金属氧化物半导体工艺设计,仿真结果表明:基准电压源的电源电压范围可达0.5~3.3V,线性调整率为0.428%V-1,功耗最低仅为0.41nW;在1.8V电源电压、-40~125℃温度范围内,温度系数为4.53×10-6℃-1,输出电压为230mV;1kHz下电源抑制比为-60dB,芯片版图面积为625μm2。该基准电压源可满足植入式医疗、可穿戴设备和物联网等系统对芯片的低压低功耗要求。     

一种低电压、低功耗CMOS基准电压源的设计

本文设计了一种低电压、低功耗、高电源抑制比CMOS基准电压源。该电路基于工作在亚阈值区的MOS管,利用PTAT电流源与微功耗运算放大器构成负反馈系统以提高电源电压抑制比。SPICE仿真显示,在1V的电源电压下,输出基准电压为609mV,温度系数为72ppm/℃,静态工作电流仅为1.23μA。在1-5V的电源电压变化范围内,电压灵敏度为130μV/V,低频电源电压抑制比为74dB。该电路为全CMOS电路,不需要用到寄生PNP三极管,具有良好的CMOS工艺兼容性。     

一种低压高精度基准电压源的设计

提出一种新型基准电压源,通过低阈值源跟随电路和新颖的启动电路实现输出的低压高精度.低阈值源跟随电路通过降低运放的输出阻抗减少系统增益,减少运放失调对输出电压精度的影响,同时低阈值耗尽型管的采用,降低了电源电压和基准电压间的压差,使得该结构可工作于低压系统中;启动电路通过实时监测基准输出电压,加速启动速度的同时消除输出电压过冲现象.该基准电压源已应用于一款线性稳压电源(Low dropout voltage regulator,LDO)中,并基于标准0.35μm CMOS工艺用Cadence的Spectre工具进行仿真验证.仿真结果表明:输出电压启动过程平缓无上冲,基准电压稳定输出为1.215 V@VCC≥1.5 V,静态电流为9 uA@6 V;在-40℃～100℃下,温度系数为26 ppm/℃,电源电压抑制比为85 dB@1 kHz;在电源电压为3 V～6 V下,线性调整率为4.57 ppm/V.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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