基于Multisim的一、二阶有源低通滤波器静态与时频域特性对比
Static, Time and Frequency Characteristics of First-and Second-order Active Low-pass Filters via Multisim
张宏霞 1贾思萌 1段人玮 1于洪仕1
作者信息
- 1. 辽宁工程技术大学，电子与信息工程学院，葫芦岛，125000
- 折叠
摘要
为量化一、二阶有源低通滤波器的核心性能差异，为小型模拟信号调理电路的滤波器选型提供试验依据，采用控制变量法，统一设定两类滤波器截止频率为100Hz、通带电压增益为2，搭建一阶同相有源低通电路与二阶对称RC级联有源低通电路，基于Multisim仿真平台完成静态工作点、时域正弦稳态响应与频域幅相特性的系统测试。结果表明，两类电路静态工作点偏差均小于1mV，通带线性传输特性一致；二阶滤波器阻带衰减速率达40dB/十倍频，对1kHz高频干扰的抑制能力较一阶提升14.11dB，但高频相位失真更为显著。研究明确了两类滤波器的性能优势与适用边界，可为同类滤波电路的基础设计提供参考。
Abstract
To quantify the performance differences between first- and second-order active low-pass filters and provide experimental basis for filter selection in small analog signal conditioning circuits, this paper adopts the control variable method. Two filters with a cut-off frequency of 100 Hz and pass-band voltage gain of 2 are designed: a first-order in-phase active low-pass filter and a second-order symmetric RC cascaded active low-pass filter. Their static operating points, time-domain sinusoidal steady-state responses, and frequency-domain amplitude and phase characteristics are tested via Multisim. The results show that both circuits have static operating point deviations below 1 mV and consistent pass-band linearity. The second-order filter has a stop-band attenuation rate of 40 dB/decade, offering 14.11 dB better suppression of 1 kHz high-frequency interference than the first-order filter, though with more significant high-frequency phase distortion. This study clarifies the performance advantages and applicable scenarios of the two filters, providing a reference for the design of similar filter circuits.关键词
模拟电子技术/有源低通滤波器/Multisim仿真/时频域特性Key words
Analog Electronic Technology/Active Low-pass Filter/Multisim Simulation/Time and Frequency Domain Characteristics引用本文复制引用
张宏霞,贾思萌,段人玮,于洪仕.基于Multisim的一、二阶有源低通滤波器静态与时频域特性对比[EB/OL].(2026-07-03)[2026-07-05].http://www.paper.edu.cn/releasepaper/content/202607-3.学科分类
电子电路
