摘要
本文提出了利用CMOS OTA综合连续时间电流模式滤波器的方法。应用信号流图模拟,系统地生成了二阶CMOS OTA电流滤波器。分析了OTA的非理想因素对滤波器高频性能的影响,并给出了简单的高频补偿方案。最后,给出了一个四阶巴特沃思低通滤波器的设计实例并经PSPICE仿真证实。
A methodology to synthesise continous-time current-mode filters using CMOS OTAs is presented. Second-order CMOS-OTA current fllters are systematically generated from the simulation of signal flow graph for a general biquadratic function .The non-ideal effects in high frequency compensation frequency characteristic of OTA-C filters are analyzed. A simple high off frequency method is discussed. Finally, A 4th-order Butterworth lowpasss filter with 1MHz cut and simulated with PSPICE program.
基金
国家自然科学基金
湖南省自然科学基金
机械部教育司科技基金
关键词
电流模式电路
运算跨导放大器
有源滤波器
Current mode circuits, Operational transconductance amplifiers, Active filters, Circuit ddesign, Network systesis
