【作者】 周德福；

【导师】 欧钢； 张勇虎；

【作者基本信息】 国防科学技术大学 ， 电子与通信工程， 2011， 硕士

【摘要】 连续时间滤波器是模拟滤波器的一种。它具有工作在连续时间这一重要特性,所以连续时间滤波器被广泛应用于通信、视频信号处理、计算机存储系统、电阻测量、自动控制等领域,尤其是在数模混合信号和集成电路中有着重要的应用。OTA-C结构的连续时间滤波器具有良好的高频性、极强的电路综合能力和CMOS工艺的可兼容性,被广泛应用于大规模集成电路中。本文以我国北斗二代卫星导航接收机为课题背景,对OTA-C模拟集成滤波器进行系统的研究。不同于GPS接收机窄带中频滤波器,北斗二代卫星接收机中频滤波器为宽带带通滤波器。所以本文的主要目标是设计功耗低、可集成的“北斗”中频宽带带通滤波器。主要工作是通过研究OTA-C有源滤波器,基于“北斗”接收机基带芯片所需的中频信号特性,确定接收机中频滤波器性能要求。最后采用TMIC 0.18μm CMOS工艺设计了一款适合于“北斗”系统卫星导航接收机的高带宽中频带通滤波器。论文首先给出课题研究背景和选题意义,介绍集成有源滤波器发展历程和研究现状。然后给出了CMOS跨导运算放大器的基本概念、基本应用和几种CMOS跨导运算放大器结构,并提出了本课题所采用的OTA结构电路。详细说明了二阶和高阶OTA-C结构滤波器的设计方法,并给出了相应的设计实例,重点阐述了一款适合于卫星接收机的宽带中频滤波器设计实例。ADS仿真结果表明:该OTA-C滤波器的功能和性能满足北斗二代卫星接收机中频滤波器需求。最后,针对滤波器在制造容差,工艺变化,温度漂移以及器件老化影响下,发生频率漂移的问题,给出了几种频率调谐方式。更多还原

【Abstract】 Continuous-time filters characterized of working continuously are widely used in communications, video signal processing, computer storage systems, electronic measurement, automatic control and so on, especially in the mixed signal circuits of digit and analog. Continuous-time filters structured with OTA-C are applied on a large scale in integrated circuits because they have good high frequency characteristic, electrically controlled ability, and compatibility with CMOS.This study discusses systematically the OTA-C analog integrated filters on the background of RNSS satellite navigation receiver. RNSS broadband satellite receiver IF filters, different from GPS receiver narrowband IF filters, are Broadband BP filters. The main objective of this study is to design RNSS IF broadband BP filters with less consumption. Main task is to make sure the performance of the receiver IF filters through researching OTA-C active filter and the IF signal required by RNSS receiver. Finally we design a broadband BP IF filter for RNSS navigation satellite receiver system withTMIC 0.18μm CMOS.Firstly we brief the significance of this study with the developments and states of integrated active filter, and the definition, application, classes of CMOS OTA-C and the OTA circuits used in this study. Then we illustrate several programs and examples with OTA-C structure fully integrated active filters and emphasize the example of fitting the satellite receiver wideband IF filters. ADS simulation result shows that the function and performance of OTA-C filters matched with the RNSS satellite receiver IF filter. Finally, we give several frequency tunings to resolve the frequency drift caused by the manufacturing, process changes, temperature drift and aging device.更多还原