可编程增益放大器的分析与设计

发布时间：2018-08-26 16:31

【摘要】：可编程增益放大器是集成电路中的重要模块,广泛地应用在无线通讯系统、医疗等领域。可编程增益放大器是自动增益控制环路中的重要组成部分,自动增益控制环路的作用是为后面电路提供稳定的输出信号幅度,防止电路因为输入信号太大而发生饱和或因为输入信号太小而不能正常工作,这样有利于后面电路发挥最优的系统性能。本文从自动增益控制环路基本原理开始研究,介绍了可编程增益放大器的基本工作原理和一些设计指标。然后从开环和闭环基本结构研究了几种典型结构的可编程增益放大器。同时对高精度可编程增益放大器的设计介绍了几种精确增益控制方法。经过对可编程增益放大器详细的理论分析,设计了一款可编程增益放大器。在设计过程中所涉及到的增益提高技术、宽摆幅电流镜和共模反馈电路进行了十分详细的分析。设计采用TSMC0.18μmCMOS工艺实现,仿真结果表明性能指标满足预期要求。
[Abstract]:Programmable gain Amplifier (PGA) is an important module in integrated circuits, which is widely used in wireless communication system, medical treatment and so on. The programmable gain amplifier is an important part of the automatic gain control loop. The function of the automatic gain control loop is to provide a stable output signal amplitude for the subsequent circuit. In order to prevent the circuit from saturation because the input signal is too large or because the input signal is too small to work properly, it is advantageous for the latter circuit to give play to the optimal system performance. In this paper, the basic principle of the automatic gain control loop is studied, and the basic working principle and some design indexes of the programmable gain amplifier are introduced. Then, the programmable gain amplifiers with several typical structures are studied from the open loop and closed loop structure. At the same time, several precise gain control methods are introduced for the design of high precision programmable gain amplifier. A programmable gain amplifier is designed after detailed theoretical analysis of the programmable gain amplifier. In the process of design, the gain enhancement technology, wide swing current mirror and common-mode feedback circuit are analyzed in detail. The design is implemented by TSMC0.18 渭 mCMOS process. The simulation results show that the performance index meets the expected requirements.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN722

【相似文献】