一种高摆率低功耗无片外电容的LDO设计

本文介绍了一种低功耗的无片外电容快速响应的低压差线性稳压器(LDO),用于数字电路供电.该LDO采用电流型跨导运算放大器,克服了传统运算放大器摆率和静态电流之间的矛盾.提出了一种瞬态增强电路,既可以动态地调整误差放大器偏置,同时也能够直接对调整管栅极电压进行调节,增强了负载瞬态响应性能.该LDO基于28nm CMOS工艺,面积为55×42μm2.输入1.1V,压差约为100mV,最大负载电流50mA.静态电流为5μA,在负载电流变化率为49.9mA/μs的情况下,恢复时间为2.5μs,过冲电压和下冲电压均小于100mV.     

一种用于光电标签的高电源抑制比的低功耗无片外电容低压差线性稳压器

介绍了1种无片外输出电容结构的低压差线性稳压器(LDO).该结构采用TSMC 0.18μm标准CMOS工艺设计,利用体调制效应,提高了LDO的稳定性和其瞬态响应.电路的面积为300×165 μm~2,基于Cadence仿真,其最大负载电流为10 mA,输入电压2 V,输出电压为1.8 V.当负载电流为1 m A时,静态电流和电源抑制比分别为83.8μA和-82.6 d B.     

单片集成低静态电流低压差线性稳压器设计

设计了一款静态电流小、驱动能力大、环路响应快的单片集成低压差线性稳压器,重点介绍了误差放大器、补偿电路和瞬态响应增强电路的设计方法.误差放大器的输入管采用共源共栅结构,输出级采用推挽电路,可提高放大器的驱动能力;补偿电路使用共源共栅补偿方法,补偿电容约1pF,环路相位裕度大于60°;瞬态响应增强电路采用动态偏置结构,使稳压器输出电压的上过冲有明显改善,提高了瞬态响应性能.稳压器的输出不用接片外电容,在片内集成50-100pF的电容即可稳定工作.     

一种提高电源抑制率的线性稳压器设计

提出了一种高电源抑制率的低压降线性稳压器.该线性稳压器采用基于二极管负载的跨导运算放大器消除电流补偿型带隙基准中电流纹波;通过自给偏压的方式提高静态工作点的稳定性.在TSMC 0.13 μmCMOS工艺下进行了流片,测试结果表明,最小输入电压为1.313V,稳定输出电压为1.2V,最大负载电流为70 mA;在满负载时,测得100 Hz和10 kHz时的电源波纹抑制率(PSRR)分别为-65 dB和-68 dB,功耗电流为93 μA,电源效率为91％;核心芯片面积为0.034 mm2.     

一种用于光电标签的高电源抑制比的低压差线性稳压器设计

高电源抑制比低压差线性稳压器(LDO)采用UMC 0.18μm标准CMOS工艺进行流片,电路中采用偏置电流提升技术、偏置复用等技术来降低LDO的功耗.为保证LDO的稳定性,电路采用密勒补偿技术增强系统的相位裕度.同时,采用前馈结构来提高在低静态电流时LDO的瞬态响应.输入电压为光电池所提供的2 V电压,输出电压为1.8 V,该稳压器的最大负载电流约为13 m A.当负载电流为2 m A时,电源抑制比约为-67d B,其带宽在6 k Hz左右.稳压器的静态电流约为32.2μA,芯片面积为320×224μm~2.     

采用AB类源跟随器的无片外电容快速瞬态响应LDO

文章提出一种快速响应、高稳定性、无片外电容的低压差线性稳压器(low dropout regulator,LDO),应用于无线能量传输系统中的接收端电源管理.采用电容耦合方式感知负载变化,可以有效检测输出端负载跳变,在负载瞬间跳变时增大功率器件栅极电容的充放电电流,具有摆率增强的作用,增强瞬态响应.缓冲级采用AB类超级...     

基于0.35 μm CMOS的高性能LDO稳压器设计

为降低芯片负载波动及电源干扰对系统输出的影响,以提高芯片性能,基于0.35 μm CMOS(Complementary Metal Oxide Semiconductor)工艺,采用Cadence设计了高性能的无片外电容低压差(LDO:Low Drop-Out) 线性稳压器集成电路,给出了负载瞬态响应增强网络以及电源干扰抑制增强网络的设计方案并进行了仿真实验。实验结果表明,电路具有良好的线性调整率和负载调整率,各项性能指标均符合行业标准,系统在3～5 V的输入电压范围内,稳定的输出电压为2.8 V,电源抑制比在高频1 MHz时达到-46dB,负载变化引起的输出电压过冲小于55 mV。     

一种电源抑制比增强的带隙基准电压源设计

本文介绍了一种适用于低功耗、高电源抑制比的低压差线性稳压器(LDO)低温漂、高电源抑制比带隙基准电路.该电路在原有传统的带隙基准电路的基础上,通过在误差放大器输出端与带隙基准电流镜之间添加结构简单的PSRR增强电路,使得本文设计的带隙基准较常见带隙基准的电源抑制比(PSRR)提高了近20 dB.本文基于CSMC 0.5 μm工艺Spectre仿真分析结果表明:在-25℃到85℃的温度范围内,输出电压变化值仅为0.3 mV,有较好的温度特性.在10 K处的电源抑制比为75dB,在60℃的条件下,输出电压在电源电压2.75～5 V的变化范围内,仅为90μV的波动,整个电路有较好的线性调整率.整体电路功耗小于20μA.     

一种新型高电源抑制比的低压差线性稳压器

提出了一种新的基于前向通路结构的高电源抑制比（PSRR）的低压差线性稳压器（LDO）结构,具有全负载范围内PSRR高、通路对系统稳定性影响小、电流效率高等特点.采用chart 0.35μm 5 V CMOS工艺进行电路设计仿真.后仿真结果表明,全负载范围内最差线性调整率为633μV/V.1 kHz处PSRR为76 dB...     

外层型人工视网膜中CMOS感应无线电能接收电路

针对外层型人工视网膜电路对感应无线电能的需求特性,提出了一种适用于外层型人工视网膜的CMOS感应无线电能接收电路。主要实现方法是用CMOS整流器输出作为稳压电路和自偏置电路的电源,而自偏置电路为输出稳压电路提供与电源无关的偏置。采用Cadence 工具和Chartered 0.35 μm CMOS工艺器件模型进行设计,用外层型人工视网膜中的振荡电路阵列作负载,仿真结果表明该外层型人工视网膜中的CMOS感应无线电能接收电路能提供稳定的3.3 V电压输出和大于1 mA的电流负载能力,其版图面积为62 μm×195 μm。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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