Active filter technologies
Active filters - Synthesis and fabrication
Article REF: E115 V1
Active filter technologies
Active filters - Synthesis and fabrication

Author : Gaëlle LISSORGUES

Publication date: May 10, 2008, Review date: May 21, 2024 | Lire en français

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1. Active filter technologies

The design methods and schematics of active filters are highly dependent on the technologies used in their final realization. That's why we present them first.

Three types of technology are used in practice.

1.1 Active filters with discrete components

They are assembled on printed circuit boards or surface-mounted devices (SMD), for laboratory production or low-volume runs. The components used are :

  • metal-film resistors, which can be of very high quality, precise and stable over a wide range of values;

  • capacitors of sufficient quality for the filter's operating frequency, but with standard values and tolerances (10% and series E12, for example) to keep...

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