Basic Active and Passive Filters - surflibrary.org

Basic Active and Passive Filters Bruce C. Gabrielson, PhD. Security Engineering services 5005 Bayside Rd. Chesapeake Beach, MD 20732. Introduction Regardless of the specific electromagnetic discipline involved, an understanding of Basic filter design techniques and applications is essential for reducing emission (and resulting radiation). problems. Passive or Active Filters are used to reduce conducted emissions on powerlines, signal lines, and control lines, as well as for decoupling protection between noisy circuit components. Therefore, depending on application, Filters can be considered as containment or as source suppression components. This paper first revisits Basic filter theory, then examines typical emission controlled or low noise applications for both Active and Passive filtering. Filters using ferrite bead materials on signal lines will not be addressed. Basic Theory Filters (absorptive or reflective) are used to pass signals or currents at certain frequencies to the intended load, while shunting unwanted frequencies to ground or sending them back to their source.

1 Basic Active and Passive Filters Bruce C. Gabrielson, PhD Security Engineering services 5005 Bayside Rd. Chesapeake Beach, MD 20732 ses@blackmagic.com

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