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摘要摘要近年来，集成电路产业的高速发展，推动了低成本、低功耗手表的发展。同时由于CMOS技术的不断进步，使表的功能日趋完善和优化。本文系统的阐述了电源电压是1.5V，而整个电路正常工作需要3V，能显示时、分、秒的三位半数字表芯片电路的设计，并且深入浅出的研究了三位半数字表芯片电路设计中的许多关键技术。首先，本文简单介绍了三位半数字表芯片电路的工作原理。然后详细阐述了倍压电路和显示模块的原理和设计过程。最后，应用Cadence模拟仿真软件Hspice，数字仿真软件NC_verilog对电路进行了仿真和优化，验证了其工作原理的正确性，并使电路功能均达到或优于要求。关键字：倍压电路，1/2偏压产生电路，显示译码器1AbstractAbstractNowadays,withtheexplosivegrowthintheintegratecircuitindustry,lowcostandlowpowerwatcheshavebeenadvancing.Atthesametime,duetothedevelopmentoftheCMOStechnology,thefunctionsofthewatchesareonthewaytobeperfect.Inthispaper,thedesignofthe3（1/2）digitalwatchwasstudied.Itmustbeworkedundera3Vpowersourcesupply,butweonlyusesingle1.5Vbattery.Thewatchcanshowthesecond,minuteandhourthroughliquidcrystaldisplay.Inaddition,numbersoftrickytechniquesutilizedincircuitimplementationswereexplainedinasimpleway.Thispapercommenceswithabriefintroductionofthemaintheoryinthe3（1/2）digitalwatch.Then,thevoltagedoubleranddisplaymoduleweredepictedindetails.Last,itdescribesthathowweoptimizedthecircuitandvalidatedthecorrectnessofitthroughthesimulation,whichhadbeendonebyHspiceandNC_verilog.Withtheeffortwehaveafforded,theresultingcircuitmeetsthedemandofthespecification.Keywords:Voltagedoubler,1/2biascircuit,displaydecoderII目录目录第一章引言.....................................................................................................................11.1数字表的历史和现状.................................................................................................11.2本文所做的工作.........................................................................................................1第二章三位半数字表芯片电路的基本工作原理.........................................................32.1组成及基本工作原理概要.........................................................................................32.1.1石英晶体振荡器......................................................................................................42.1.2基准电压源..............................................................................................................62.1.3按键电路和状态控制电路......................................................................................72.1.4计数器......................................................................................................................92.2结束语.......................................................................................................................12第三章倍压电路...........................................................................................................133.1电荷泵原理...............................................................................................................133.2电荷泵能量转换过程...............................................................................................133.2.1正倍压电荷泵电路................................................................................................143.2.2电荷泵电压反转器................................................................................................153.3倍压电路的选择...