The sections in this article are An Overview of Classical Filters The Synthesis of Filters Surface Acoustic Wave Filters Areas for Future Study Acknowledgments
The most common types of components for classical filters are lossless inductors and capacitors, as well as ideal transformers for the two‐port and resistances R1 and R2 as internal resistance of the source and as the terminating load. This case is treated in this article. Other types of components are switches such as FETs, capacitors, and operational amplifiers in so‐called switched capacitor filters or delays, adders and multipliers in digital filters or resistors, capacitors and operational amplifiers in RC‐active filters, or electromechanical transducers and a set of electrodes in surface acoustic wave (SAW) filters, which are treated in the last section. Guidelines will be presented on how to determine from filter tables the component values of a filter meeting given specifications. This should enable a system engineer to achieve a quick filter design by selecting the appropriate type of filter and by then finding the component values in a table.
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