【作者】 杨晓峰；

【导师】 张科峰；

【作者基本信息】 华中科技大学 ， 软件工程， 2009， 硕士

【摘要】 随着人类对数字生活的依赖日益加深,模拟器件的生存空间愈见兴旺,归根结底都是来源于真实感官世界的需求。自然界是一个模拟的世界,人们以模拟的方式对其进行感知和改造,作为数字领域与模拟世界的连接桥梁,模数转换器已成为现代电子系统必不可少的关键部分。如何提高模数转换器的性能、降低功耗、控制成本成为一个重要问题。流水线结构模数转换器以其高速度、高精度的特性以及兼顾面积和功耗的要求而得到了广泛的应用。因此,本文主要对一种12bit、采样频率100MHz的流水线模数转换器进行了研究和设计。本文首先从流水线模数转换器的基本原理入手,通过分析其主要性能参数、1.5bit/级数字校正原理及非理想特性与误差来源,对其作系统级优化设计,并提出一种共享运算放大器的改进型可重构流水线结构。该结构有两种工作模式:模式1为12bit、采样频率100MHz的8级流水线模数转换器;模式2为9bit、采样频率50MHz的双通道5级流水线模数转换器,两种工作模式通过一组互斥开关相互切换。与传统结构相比,本文提出的改进型可重构流水线结构的运算放大器数量节省了近一半。最后给出了流水线级对运算放大器的要求及指标的计算方法,并对流水线模数转换器的关键单元电路如运算放大器、比较器、MDAC、线性开关做了设计与仿真。更多还原

【Abstract】 As mankind’s reliance on digital life strengthens day by day, see prosperous in the living space of the simulation device, all stem from the world demand of true sense organ after all. The nature is a world of analog, people perceive and transform it in a manner of analog, as the connection bridge of the digital field and analog world, A/D converter become an essential key part of modern electronic system. How to improve the performance of the A/D converter, reduce the power consumption, control the cost to become an important problem. Pipeline structural A/D converter is widely used because of its high-speed, high-accuracy characteristic and compromise of chip area and power consumption. So, This paper studies the pipeline A/D converter which is designed a kind of 12bit, sampling frequency 100MHz.This paper proceeds with basic principle of the pipeline A/D converter at first, through analyzing its main performance parameter, 1.5bit /stage digital calibration principle, non-ideal characteristic and error source, do a grade of system optimization, then propose a kind of improved sharing operational amplifier reconfigurable structure of pipeline A/D converter. This structure has two kinds of work pattern: Mode 1 is 8 stages pipeline A/D converter of 12bit, sampling frequency 100MHz; The mode 2 is 5 stages dual-channels pipeline A/D converter of 9bit, sampling frequency 50MHz, the two work patterns switch over each other through a group of mutual exclusion switches. Compared with traditional structure, the improved reconfigurable pipeline A/D converter structure that This paper put forward can save nearly half operational amplifier. At last this paper provide the pipeline stage’s requirements for operational amplifier and parameter calculation,, and then design and simulation the key block circuit of the pipeline A/D converter such as operational amplifier, comparator, MDAC, linear switch..更多还原