论文总字数：16997字

摘 要

集成电路芯片产业的迅速发展衍生了混合信号集成系统，比较器电路是其中必不可少的模块。比较器作为这些电路中的关键，它的性能决定了整个电路系统的精度。随着集成产业的飞速发展，电子产品的升级也伴随着电路系统的复杂化，意味着对电路稳定性和精度的要求也就更高。人们不再局限于单单的用感官去体验环境，更希望借由科技去比较那些肉眼所看不见的细微差别。因此，比较器的研究尤为重要。

本次课题基于中芯国际(SMIC)0.18 μm CMOS工艺设计一款带有前置预放大器的动态比较器电路。该比较器由预放大器和动态比较器两部分电路组成，预放大器通过引入弱正反馈机制增大增益，高速动态比较器采用带时钟的低功耗高速正反馈动态比较器。本文阐述了放大器和动态比较器电路的设计过程，在此基础上，用Hspice软件进行参数设计和电路各项性能仿真。

本次设计的带前置预放大器的动态比较器性能：预放大器增益为14.4dB，大约为5.24倍，在负载为1pF电容时，单位增益带宽为5.4MHz，相位裕度为101°，满足稳定工作的要求。比较器的分辨率约为1mV，工作在1.111MHz的频率上，总体功耗为5.06mW，满足设计指标的要求。

关键词：前置预放大器；动态比较器；CMOS

Design and Simulation of Dynamic Comparator Circuit with Preamplifier

Abstract

The rapid development of the integrated circuit chip industry derived from the mixed signal integrated system, the comparator circuit is one of essential module.As the key of these circuits, the comparator"s performance determines the precision of the whole circuit system.With the rapid development of the integration industry, the upgrading of electronic products is accompanied by the complexity of the circuit system, which means that the circuit stability and precision requirements are higher. People are no longer limited to just use sensory experience the environment, more hope to borrow by technology to compare the nuances of invisible to the naked eye.Therefore, the comparator research is particularly important.

In this experiment, a dynamic comparator circuit with preamplifier is designed based on the 0.18 μm CMOS process of SMIC. The comparator is composed of a preamplifier and a dynamic comparator, the preamplifier increases the gain by introducing a weak positive feedback mechanism, and the high-speed dynamic comparator USES a low-power high-speed positive feedback dynamic comparator with a clock.In this paper, the design process of amplifier and dynamic comparator is described emphatically. Based on this, the parameter design and circuit performance simulation are carried out with Hspice software.

In summary, the basic knowledge, performance index and basic structure of the comparator circuit were firstly understood, and then the dynamic comparator was designed by using Hspice simulation tool. In this process, the design process and simulation skills related to Hspice were mastered.The design of dynamic comparator with front pre amplifier performance is as follows: pre amplifier gain of 14.4 dB, is about 5.24 times, when the load is 1 pF capacitor, unit gain bandwidth is 5.4 MHz, phase margin is 101 °, meet the requirements of stable jobs. The comparator has a resolution of about 1mV and works at a frequency of 1.111MHz. The overall power consumption is 5.06mW, meeting the requirements of the design index.

Keywords: preamplifier; dynamic comparator; CMOS

目 录

摘 要.............................................................................................................................................................I

Abstract........................................................................................................................................................II

第一章 绪 论........................................................................................................................................................1

1.1研究背景与意义. ........................................................................................................................................1

1.2国内外研究现状......................................................................................................................................... 1

1.3本文工作安排............................................................................................................................................. 2

第二章 比较器电路基础..................................................................................................................................... 3

2.1比较器介绍................................................................................................................................................. 3

2.1.1 比较器性能参数................................................................................................................................. 4

2.1.2 比较器特性分析................................................................................................................................. 5

2.1.3 比较器电路结构................................................................................................................................. 6

2.2本章小结....................................................................................................................................................10

第三章 比较器电路的设计与仿真....................................................................................................................11

3.1 预放大器电路的建立和仿真 ..............................................................................................................12

3.2比较器电路的建立和仿真........................................................................................................................15

3.3本章小结....................................................................................................................................................18

第四章 总结........................................................................................................................................................19

致 谢..............................................................................................................................................................20

参考文献(References).........................................................................................................................................21

绪 论

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