1、摘 要 低通滤波器是一个通过低频信号而衰减或抑制高频信号的部件。 理想滤波器电路的 频响在通带内应具有一定幅值和线性相移，而在阻带内其幅值应为零。有源滤波器是指 由放大电路及 RC 网络构成的滤波器电路，它实际上是一种具有特定频率响应的放大器。 滤波器的阶数越高，幅频特性衰减的速率越快，但 RC 网络节数越多，元件参数计算越 繁琐，电路的调试越困难。根据指标，本次设计选用二阶有源低通滤波器。 关键词：低通滤波器；集成运放 UA741； RC 网络 Abstract Low-pass filter is a component which can only pass the low freque
2、ncy signal and attenuation or inhibit the high frequency signal . Ideal frequency response of the filter circuit in the pass band should have a certain amplitude and linear phase shift, and amplitude of the resistance band to be zero. Active filter is composed of the RC network and the amplifier, it
3、 actually has a specific frequency response of the amplifier. Higher the order of the filter, the rate of amplitude-frequency characteristic decay faster, but more the number of RC network section, the more complicated calculation of device parameters, circuit debugging more difficult. According to indicators ，second-order active low-pass filter is used in this design . Key words：Low-pass filter； Integrated operational amplifier UA741； RC network, 1 目目 录录 引言引言3 1 电路原理及设计方案3 1.1 滤波器的介绍3 1.2 有源滤波器的设计.3 1.3 设计方案5 2 芯片介绍.6 2.1 运放 UA7416 3 multisim7辅助仿真及修正.7 4 制板及调试.8 4.1 DXP注意事项
