基于NI Multisim 10的有源滤波器的设计与仿真

有源滤波器因其体积小、重量轻、成本低、可靠性高、提供增益放大、设计标准化、模块化、便于集成等突出的优点，在信号处理中有着广泛的应用。在对MFB（无限增益多路反馈）滤波电路的传递函数分析基础上，由2阶MFB阶低通滤波电路级联的方法构建了有源低通滤波器，用查表法设计了基于巴特沃斯逼近的8阶有源低通滤波器，并用NIMuhisim10软件对设计的滤波器的交流特性进行了仿真分析，其交流特性符合设计理论，具有一定的参考价值。

Design and Simulation of an Active Filter Based on NI Multisim 10

Active filter is widely for signal processing because of its prominent advantages, such as small volume, light weight, low cost, high reliability, thus providing of the enhanced gain standardization of design, modularization and easy to integration and so on. So there＇s big practical significance to study its design. On the basis of analysis of the transfer function of MFB circuit a low pass filter is designed by connection of a two- stage low pass filter of MFB and a eight-stage low pass filer which approximates Butterworth is designed by look-up table. The result has certain reference value through the simulation study of the AC characteristics of the designed pass filter with NI Muhisim 10 software and its AC characteristics are in accord with the design theory.