基于标准数字CMOS工艺的高精度基准电压源的研究

【作者】 王旃；

【导师】 严晓浪； 无晓波；

【作者基本信息】 浙江大学 ， 电力电子与电力传动， 2002， 硕士

【摘要】 基准电压源(Voltage Reference)是超大规模集成电路和系统的重要组成部分，应用于高精度比较器、A／D和D／A转换器、随机动态存取存储器、闪存电路等多种电路和电路单元，亦为系统集成芯片(SOC，System on a Chip)所广泛采用。设计构成可复用的与通用数字电路工艺兼容的高稳定度基准电压源具有重要意义。 温度和电压稳定性是基准电压源的重要指标，直接影响电路和系统的稳定性及多项性能指标，亦是本文设计中关注解决的重点。 基准电压源的构成形式繁多。其中，带隙基准电压源因其高稳定度、低温漂、低噪声且构成简单等优点而得到普遍重视，亦为本文所采用。论文详细描述了一个运用标准数字CMOS工艺实现的、采用MOS管的栅源电压差进行有效的温度曲率补偿的带隙基准电压源电路的设计。工作由电路的拓扑构成开始，直至其底层的物理设计，并转化成GDSII标准格式文件交由相关厂家进行流片验证。HSPICE仿真结果显示：该基准源在-40℃～100℃的温度变化范围内，具有11ppm／℃的低温度系数；当电源电压在8～18V变化时，输出电压变化量仅为1mV；并且电路结构简单，具有较小的芯片面积和功耗。更多还原

【Abstract】 Voltage Reference is an essential subcircuitry in VLSI and lots of electronic systems. It is widely used in many circuits, such as high precise comparators, A/D and D/A converters, DRAMs, flash memory circuits, and other analog or mixed circuits. Therefore, it is significant to develop a voltage reference circuitry that is compatible with digital CMOS technology and can be integrated into a system on a chip (SOC).Low temperature drift and high stability of output voltage is of key importance to an ideal voltage reference. They are also the focus of this paper.So far, the bandgap reference is the most popular circuit, which successfully achieves the requirements mentioned above. It exhibits both high stability and low temperature coefficient, also has low noise and simple topology. In this paper, a precise CMOS bandgap voltage reference which uses the difference of MOS source-gate voltage to perform efficient curvature compensation is described in detail, which is compatible with standard digital CMOS process. The depiction is from topology to physical design. Finally, it has been transformed to standard CDS II format document to be implemented. The HSPICE simulation result shows a temperature coefficient of 11 ppm/"C from -40 癈 to 100’C and output voltage variation of 1mV for supply voltage range from 8 V to 18 V. Due to novel curvature compensation, the circuit structure of the proposed reference is simple and both chip area and power consumption are small.更多还原