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滤波器是一种选频网络,它能选出有用信号而抑制无用信号和干扰。因此,它被广泛用于电工技术领域,在信号的检测与处理方面,具有很好的抗干扰能力。它不仅适用于正弦信号,而且可将慢变化的直流信号提取出来。本文涉及各种类型的滤波电路,首先阐明了低通滤波器最佳特性的选取方法,继而提出并证实了低通-高通、低通-带通、低通-带阻滤波特性的转换,最后介绍了一种通用滤波电路。该电路如有源滤波网络。滤波参数能够独立进行调节,它具有精度高、稳定性能好等优点。
A filter is a frequency-selective network that selects useful signals to suppress unwanted signals and interference. Therefore, it is widely used in the field of electrician technology, and has good anti-interference ability in signal detection and processing. It is not only suitable for sinusoidal signals, but also can extract slowly changing DC signals. This article involves various types of filter circuits, first of all clarified the selection of the best characteristics of the low-pass filter, then proposed and confirmed the low-pass - high pass, low pass - band pass, low pass - band rejection filter characteristics of the conversion, and finally A general filter circuit is introduced. This circuit is like an active filter network. Filter parameters can be adjusted independently, it has high precision, good stability and other advantages.