文档介绍：电流控制模式RC振荡器的设计摘要随着便携式电子器件的广泛应用,对低电压低功耗集成电路的需求也在不断增加。本设计是采用RC电流控制模式的振荡器,这种架构的振荡器广泛应用于微控制器、便携式医疗器件等对时钟频率精度要求不是太高的设备中。在电压和温度变化的情况下可以通过Trimming模块提高振荡器输出频率的精度,满足设计的要求。在此电流控制模式振荡器电路设计中,作者首先阐述了振荡器电路的类型和基本工作原理,然后介绍MOS晶体管在90nm的工艺条件下出现的反短沟道效应,并根据设计要求进行了电路的总体结构设计和子模块电路的设计。重点分析了典型电路模块:电压基准源电路、电流偏置电路、运算放大器(OPA)、比 parator)、高精度电流镜。该芯片采用UMC 90nm Low leakage RVT CMOS 工艺,,---,,输出时钟频率为50MHz,占空比50%。设计了温度性能良好的电压基准源电路和与电源无关的电流偏置电路,工作温度范围为-40℃至125℃; 在完成电路原理分析与电路结构设计的基础之上,应用EDA软件HSPICE 对各个子电路模块和整体电路进行了功能仿真,仿真结果均达到或优于预定指标,验证了设计理论。完成电路仿真后还进行了版图设计,版图验证及后仿真, 理论分析和仿真结果数据表明, ,温度一40℃~ 125℃,电阻类型为典型、最大、最小三种情况,Corner为TT、SS、FF、SF、 FS情况下该电路的输出频率、占空比、整体启动时间、整体电路电流都满足了设计的需要,实现了频率偏差小、启动时间小、低功耗的目标。关键词:RC振荡器、电流控制振荡器、反短沟道效应、基准电压源、电流镜 Design ofCurrent Controlled RC Oscillator Ab stract Along with theincreasing use ofportable operated devices,the need for low voltage and low power integrated circuit has also design of this dissertation is current controlled o),this kind ofoscillator iSwidely used intheapplications such as microcontroner'portable biomedical devices, these applications the requirement for accuracy and stability are not very the voltage and temperature change,the accuracy and stability offrequency could berealized by theway oftrimming tomeet the need ofspecification. Inthisdesign of current controlled oscillators,the basic kinds and principle of oscillator are introduced reverse effect(RSCE)in 90 nm process isanalyzed inthis topology and the sub block are designed interms ofthecustomer’S ,such typical blocks are analyzed as Band—gap reference,Bias circuit,parator,High accuracy current UMC 90nm Low Leakage RVT CMOS process isused inthis power voltage range isfrom ,thefrequency ofoscillator is 50MHz,duty cycle is50%.The current and voltage reference with an excellent temperature character are also designed,the temperature range isfrom一40"C t