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1、摘要现代科技领域对电子产品的要求越来越高微处理器如单片机DSP系统的稳定性和抗干扰能力是电子工程师面临的一大难题监控技术就是解决这一难题的有效手段之一使用监控IC已成为当今的设计潮流因为它大大减少了系统电路的复杂性和元器件数量并可以提高系统可靠性和精确度现在的监控IC向着多功能系统级发展从早期仅有的电压监测发展到后来看门狗数据保护电池切换等功能也归入监控电路广泛应用于计算机工业控制通信家用电器仪器仪表等领域本课题的目的就是设计一款多功能低成本低功耗微处理器电源监控电路芯片它集成了基准带隙电压源电压比较器时基振荡看门狗等模块整合了掉电保护上电复位看门狗定时手动复位等多个功能能够监控电
2、源电压电池故障和微处理器或微控制器的工作状态为了降低芯片的成本和功耗采用了CMOS的制造工艺在设计中采用了传统的模拟电路设计方法定制设计要求电路设计电路仿真版图绘制这一自底向上的全定制方案使用的设计工具都是Cadence公司提供的全定制IC设计平台Virtuoso仿真工具Spectre和验证工具Diva本芯片设计基于上海贝岭的1.2mCMOS2P2MC12DDR工艺线对仿真结果的分析表明本文设计的电源监控电路芯片完全符合设计要求降低了成本提高了芯片的性能达到了设计目的关键词:电源管理芯片模拟电路带隙基准电压源CMOS比较器时基振荡看门狗版图设计IABSTRACTWiththeinc
3、reasingrequirementofelectronicproductsinthemodernscienceandtechnologyfield,moreandmorechallengessuchasanti-jammingandstabilityinthemicroprocessorarebroughttoelectronicengineers.Supervisorytechnologyisoneeffectivewaytosettletheseproblems.Voltagemonitoring,supervisoryintegratedcircuitsareverypop
4、ularinthedesigns,inthattheycannotonlyreducethedesigncomplexityandthenumberofcomponents,butimprovesystemreliabilityandaccuracysignificantly,comparedtoseparateICsanddiscretecomponents.ModernsupervisoryICshavethecharacteristicofmultifunction,whichallowsmanyfunctionsbesidesvoltagemonitoringsuchasw
5、atchdogtiming,dataprotectionandbatteryswitching.Foralltheseadvantages,supervisoryICshavebeenappliedinmanyfields,includingcomputers,criticalPpowermonitoringandintelligentinstruments.Inthisthesis,amultifunctional,low-cost,low-consumePsupervisorycircuitschipwasdesigned.Inthisdesign,thebandgap,vol
6、tagedifference,oscillatorandwatchdogtimermoduleswereintegratedandmanyfunctionsincludingpower-onreset,watchdogtiming,manual-resetandpower-downprotectionwererealized.Toreducetheconsumeandcost,theCMOSprocesswasadopted.Duringthedesign,wefollowedfull-customdesignmethodology:confirmthespec-circuitde
7、sign-simulation-layoutdesign-tapout.TheEDAtoolsusedinthedesignincludestheCadenceVirtuosocustomdesignplatform,thesimulationtool-Spectreandtheverificationtool-DIVA.ThedesignwasbasedontheBeilingofshanghai1.2mCMOSC12DDRprocess.Thesimulation
