有源滤波器的误差源分析

Analysis of error source in active filters.

在石油及地质勘探仪器设备的电路中常用到有源滤波器 ,而有源滤波器的误差源分析及电子电路的设计分析是众多设计者棘手的问题 ,如果解决不好 ,将严重影响到测试仪器的精度 ,甚至导致电子仪器无法正常工作。文章着重阐述了有源滤波器使用的器件———运算放大器的放大倍数与带宽、斜率与输出电阻、运算放大的偏置设计与噪声抑制等问题对有源滤波器误差的影响。

Active filters are often used in pcecision measuring instruments of petroleum and geology exploration. Error source analysis and electronic circuit design of active filters are quite tough problems for designer. If not well solved,it will affect the pcecision of these instruments,sometimes even lead to the failure of normal oprations. The paper mainly expounds the amplification and band-width of operational amplifiers used in active filters,the slope and output resistance and the offset design of operational amplifers as well as noise suppression etc.