可变带宽OTA-C连续时间低通滤波器设计  

Design of Variable-bandwidth OTA-C Continuous-time Low-pass Filter

作　　者：周德福[1] 张勇虎[1] 葛锐[1] 戴冲 

机构地区：[1]国防科学技术大学电子科学与工程学院卫星导航研发中心,湖南长沙410073 [2]武警云南森林总队,云南昆明650011

出　　处：《现代电子技术》2011年第6期157-159,共3页Modern Electronics Technique

摘　　要：实现了一种全集成可变带宽中频宽带低通滤波器,讨论分析了跨导放大器-电容(OTA-C)连续时间型滤波器的结构、设计和具体实现,使用外部可编程电路对所设计滤波器带宽进行控制,并利用ADS软件进行电路设计和仿真验证。仿真结果表明,该滤波器带宽的可调范围为1～26 MHz,阻带抑制率大于35 dB,带内波纹小于0.5 dB,采用1.8 V电源,TSMC 0.18μm CMOS工艺库仿真,功耗小于21 mW,频响曲线接近理想状态。A fully integrated wideband variable-bandwidth IF low-pass filter is presented. The structure, design and implementation of the continuous-time OTA-C filter are discussed and analyzed. The external circuit design and simulation are used by the software of ADS. The simulation results show that the filter tuning range of-3 dB bandwidth of 1 MHz - 26 MHz, stop-band rejection rate of greater than 35 dB, and the pass-band ripple less than 0.5 dB,with 2.8 V power supply, TSMC 0.18 /tin CMOS technology library of simulation, power consumption is less than 21 mW, frequency response curve close to the ideal state.

关 键 词：BUTTERWORTH滤波器 连续时间 电流模式 跨导运算放大器 

分 类 号：TN710-34[电子电信—电路与系统]