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.