【作者】 李淼；

【导师】 冯全源；

【作者基本信息】 西南交通大学 ， 通信与信息系统， 2007， 硕士

【摘要】 近年来由于集成工艺水平的提高，电路设计技术的不断改进，模拟集成电路的设计得到较大的进展，同时对电路的性能提出新的挑战。目前随着便携式电子系统的普遍应用，对模拟集成电路的各方面性能也有了更高的要求。带隙基准电压源之所以是模拟电路中重要的模块，是因为它能够提供近似恒定的参考电压，这个电压不随温度，电源电压，工艺的变化而变化。这一特性使得带隙基准电压源在诸如DC-DC电路，模／数转换器（A／DConverter），数／模转换器（D／A Converter）以及存储器（Memories）等电路当中得到广泛应用。同时，带隙基准电压源电路的结构简单，可靠性较高，可以用标准CMOS工艺实现，适宜于大规模生产，目前已成为CMOS集成电路当中最流行的一种基准电压产生器。本论文对当前流行的电源管理芯片中的重要模块基准电压源进行了研究，设计了适用于DC-DC电路step-down芯片的一种高精度，高电源抑制带隙电压基准源，整个电路采用了UMC 0.6um BiCMOS工艺。它采用了共源共栅电流镜结构，并在电源内部加入了一个两级运算放大器，两级运放输出用于自身偏置电路，合理的设计获得了高的电源抑制比。在抑制温漂方面我们利用了V_BE的负温度系数和△V_BE的正温度系数，并使用了PTAT（proportional to absolute temperature，与绝对温度成正比）的方法对温度进行了一级补偿。整个电路采用HSPICE进行进行仿真，仿真结果显示当温度为-40℃～80℃，输出基准电压变化小于1.5mV，低频电源抑制比达到75dB以上。更多还原

【Abstract】 With the development of semiconductor process and circuits design technology, Analog integrated circuit improved greatly in recent years. There is a challenge to the performance of circuits. Also with the popular use of electronic system powered by battery, the request for the functions of the analog Integrated-Circuit is much higher.Bandgap reference voltages are important analog circuit blocks. It can provide a nearly constant reference voltage which is stabilized over process power supply and temperature variation. It makes the bandgap reference voltage be used extensively in Analog to Digital Converter(A/D C). Digital to Analog Converter(D/A C), Power management circuits and memories. At the same time, bandgap reference voltage is simple in structure and more reliable, it could be implemented in standard CMOS process ,so it’s suitable for mass production. At present, the bandgap reference voltage has been the most popular reference voltage generator in CMOS integrated circuits.This thesis dose a research on the important voltage reference inside the power management chip which is popular nowadays and design a high accuracy and high power supply rejection ratio(PSRR)bandgap voltage reference which is suit for the step-down chip of DC-DC circuit. UMC 0.6um skill is used for the whole circuit. A cascade current mirror is chosen, a two-stage operation amplifier is added into the power, and the output of two-stage operation amplifier is used for the bias circuit of itself. The appropriate design gets a high PSRR. On the other hand, it takes up a temperature compensation technology to improve temperature stability. HSPICE is used for the simulation for the whole circuit, simulation showed that the output voltage varied lower than 1.5mV with a temperature range of -40℃-80℃and the lower PSRR was higher than 75dB.更多还原