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滤波器是一种能使有用信号通过而大幅抑制无用信号的电子装置。在电子电路中常用来进行信号处理、数据传输和抑制噪声等。在运算放大器广泛应用以前滤波电路主要采用无源电子元件--电阻、电容、电感连接而成,由于电感体积大而且笨重导致整个滤波器功能模块体积大而且笨重。本文介绍由集成运算放大器、电阻和电容设计有源滤波器,着重讲解低通、高通、带通滤波电路。
A filter is an electronic device that can pass useful signals and dramatically reject unwanted signals. In electronic circuits commonly used for signal processing, data transmission and noise suppression. Widely used in the operational amplifier Filter circuit before the main use of passive electronic components - resistors, capacitors, inductors connected due to the large inductor and bulky lead to the entire filter function module bulky and bulky. This article describes the integrated operational amplifier, resistor and capacitor design active filter, focusing on low-pass, high-pass, band-pass filter circuit.