Electronic filters (English: Electronic Filters) Electronic circuit components or devices that can perform signal processing functions, and are specially used to remove unwanted components or enhance needed components in signals.

As early as 65438+80' s, resistor-capacitor filter circuit appeared. The inductance-capacitance resonant circuit with frequency selection function can be used as the simplest filter.

19 15 German K.W. Wagner and Bell Laboratories G.A. Campbell put forward papers on filters respectively, which are internationally recognized as independent inventors of filters.

The oldest form of electronic filters is a passive analog linear filter composed of resistors and capacitors or resistors and inductors, which are called RC and RL monopole filters respectively.

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