【作者】 王丽；

【导师】 李晓光；

【作者基本信息】 北京交通大学 ， 微电子学与固体电子学， 2008， 硕士

【摘要】 随着技术的进步,大量的数字和模拟电路集成在一个芯片上,面积和功耗越来越受关注,因此设计一种基于标准CMOS工艺的高性能低功耗模数转换器(ADC)成为本论文的目标。ADC在无线通信、图像处理、音频技术和工业控制的广泛运用,如集成传感感器系统,传感器产生较宽的信号电平范围。本文设计了一个9-bit浮点流水线模数转换,可应用于高性能大动态范围CMOS传感器。浮点的方法加大ADC的输入动态范围,从而节省了面积和功耗,本设计的动态范围达78dB。本文对浮点流水线ADC的原理和电路进行了深入的研究,设计并实现了由可变增益放大器(实现3-bit指数位)和6-bit流水线ADC(实现6-bit尾数位)两个主要模块构成的9-bit的浮点流水线ADC。本文的研究意义在于该ADC在输出较少比特的情况下提高了它的动态范围。本文详细的设计了9-bit浮点流水线ADC的每个组成部分。第二章中,在讨论了几种ADCs后详细的介绍了浮点流水线ADC的原理。第三章中,对运放、可变增益放大器、减法器、比较器等模拟电路单元进行了详细的设计。第四章中对各类基本数字电路、触发器、译码器、时钟产生器等进行了详细的设计。第五章中,详细的设计了用于可变增益放大器级和流水线级的子级3-bit闪速ADC、DAC。最后在第六章对整个电路进行了整合与仿真。本设计是在CMOS 0.18μm工艺基础上设计实现的。更多还原

【Abstract】 As the technology advances, large volume of circuitry including analogcircuits and digital circuits is included in one chip and it is more and more important ofareas and power consuming. So it is very critical to design a high performance Analogto Digital Converter (ADC) based on standard CMOS technology which is aim of thispaper.ADCs are wide used in wireless communication, imaging process, audio, videotechnology and industrial control, such as integrated sensor systems. Also sensorsproduced a wide range of signal levels. This paper describes a 9-bit floating-pointpipelined ADC. It can be one block of high performance and favorable dynamic-rangeCMOS Sensor. The named ADC was designed to meet a large dynamic range of 78dBand the areas and power consuming are lesser.This paper introduces the principle of floating-point pipelined ADC and provides adesign of 9-bit floating-point pipelined ADC composed of two main blocks which arevariable gain amplifier (VGA) block reaching 3-bit exponent and 6-bit pipelined ADCblock reaching 6-bit mantissa.About this design, every necessary circuit was designed in detail. In chapter 2, aftercomparing several kinds of ADCs, the principle of floating-point pipelined ADC isintroduced. In chapter 3, analogy circuit analogy circuits such as high frequencyOp-Amp, low frequency Op-Amp, VGA, switched capacitor subtracter and comparatorare discussed and designed. In chapter 4, digital circuits such as every basic digitalcircuits, D flip-flop, encoder and clock generator are discussed and designed. In chapter5, 3-bit flash ADC and DAC circuits used in VGA block and pipeline block arediscussed and designed. Finally, in chapter 6, entire floating-point ADC was combinedand tested.The ADC circuit was designed in 0.18μm COMS technology.更多还原