A Basic Introduction to Filters - Active, Passive and Switched-Capacitor

Filters of some sort are essential to the operation of most electronic circuits It is therefore in the interest of anyone involved in electronic circuit design to have the ability to develop filter circuits capable of meeting a given set of specifications Unfortunately many in the electronics field are uncomfortable with the subject whether due to a lack of familiarity with it or a reluctance to grapple with the mathematics involved in a complex filter design.
This Application Note is intended to serve as a very basic introduction to some of the fundamental concepts and terms associated with filters It will not turn a novice into a filter designer but it can serve as a starting point for those wishing to learn more about filter design.