一种低噪声 快速响应ldo低压线性稳压器-low-noise fast response ldo low-voltage linear regulator.docxVIP

摘要随着CMOS技术的快速发展，尤其是器件尺寸的缩小，模拟电路和射频电路中所需的电压越来越小,这增加了模拟电路和射频电路的挑战。其中一个主要的挑战就是随着电压的急剧减小，电压的线性度，动态范围和稳定性减小。在射频电路中，随着电压的减小，噪声波纹和交叉耦合开始起主导作用。为了克服噪声，在模拟电路和射频电路中，需要有一个好的电源管理器。这个电源管理器需要有低噪声和快的瞬态特性，以此来增强电路的性能和增加电池的生命。所以本文对低压差线性稳压器进行了研究。首先，阐述了选题的背景和意义，并分析其发展趋势。其次，对LDO的各个模块进行了分析，分析了他们的原理和结构以及相应的指标。再次，对各个模块进行了设计并仿真其相关的性能参数，并重点分析了稳定性，对几种常见的稳定性补偿方法做了比较，最终采用一种嵌套密勒电容的补偿方法。最后，对整体模块进行了仿真，本文LDO的输入电压是2.5V-4V，输出电压在1.75V-1.85V之间，压差小于200mV,最大输出电流为100mA,全负载范围内静态电流约为3.5??A,负载调整率0．005％V／A，线性调整率0．001％／V。在此基础上完成了部分模块的版图。关键词：LDO线性稳压器误差放大器调整管稳定性基准电压源ABSTRACTAsCMOStechnologyisrapidlymovingtodeepsubmicrongatelengths,supplyvoltagesforanaloganRFcircuitarecontinuouslydecreasing.ThisintroducesnewchallengesforthedesignofRFandanalogcircuits.Ofthemainchallengesisthedrasticreductiononthesupplyvoltagewhichhasthelinearity,dynamicrangeandincreasesthesupplyripplesensitivityofthecircuits.WiththereductionoftheRFICssupplyvoltage,ripplenoiseandcross-couplingonthepowersupplyisplayinganimportantroleinthenoisebudget.ToovercomethenoisebudgetinRFandanalogcircuit,well-performedvoltageregulatorsarerequired.Sothepaperstudiedthelowdropoutlinearregulator.Firstly,backgroundandsignificanceareintroduced,andthedevelopmenttrendanalyzed.Secondly,eachmoduleoftheLDOwasanalyzed,includingthetheoryandstructureofthemandthecorrespondingindex.Thirdly,thevariousmodulesofthedesignandsimulationoftherelatedperformanceparametersisworkedout.Theanalysisofstabilityandthestabilitycompensationmethodisdone.ThenestedMillercompensationisadoptedeventually.Finally,thesimulationofthemoduleisanalyzed.TheLDOinputvoltageis2.5V-4V,whiletheoutputvoltage1.75V-1.85V.Thedropoutvoltageislessthan200mVandthemaximumoutputcurrentis100mA.Thefullloadrangequiescentcurrentisabout3.5??A.Theloadregulationis0.005%V/Aandthelinearregulationis0.001%/V.Thelayoutofthekeymoduleiscompleted.Keywords：dropoutlinearregulatorerroramplifierpasselementstabilitybandgapreference3.1基准电压源的设计.................................................................................153.1.1基准电压源基本点.....