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1. Introduction
1.1 Definitions
Filtering, which consists in isolating a frequency band from a complex signal, is one of the most widely used functions in electronic assemblies. However, the construction of electrical filters often poses problems that are difficult to solve: cost, size, power consumption, performance stability, noise, and so on. Many different technologies are used in practice, depending on the frequency range concerned and the parameters to be optimized as a priority. There are two main filter families: digital and analog.
Among analog filters, passive filters are almost always made up of high-quality inductors and capacitors, inserted between two resistors. These LC filters are currently mainly used at high and very high frequencies, or for high power ratings....
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The Ultimate Scientific and Technical Reference