Editing Sallen–Key topology (section)

{{short description|Electronic filter topology}}

The '''Sallen–Key topology''' is an [[electronic filter topology]] used to implement [[Low-pass filter#Continuous-time realization|second-order]] [[active filter]]s that is particularly valued for its simplicity.<ref name="EE315A_Notes">[https://ccnet.stanford.edu/cgi-bin/course.cgi?cc=ee315a&action=handout_download&handout_id=ID126954294624704 "EE315A Course Notes - Chapter 2"-B. Murmann] {{webarchive|url=https://web.archive.org/web/20100716003151/https://ccnet.stanford.edu/cgi-bin/course.cgi?cc=ee315a&action=handout_download&handout_id=ID126954294624704 |date=2010-07-16 }}</ref> It is a [[degeneracy (mathematics)|degenerate]] form of a '''voltage-controlled voltage-source''' ('''VCVS''') '''filter topology'''.  It was introduced by [[R. P. Sallen]] and [[E. L. Key]] of [[MIT]] [[Lincoln Laboratory]] in 1955.<ref name="SallenKey">{{cite journal|title=A Practical Method of Designing RC Active Filters|journal=IRE Transactions on Circuit Theory|date=March 1955|first=R. P.|last=Sallen|author2=E. L. Key |volume=2|issue=1|pages=74–85|doi=10.1109/tct.1955.6500159|s2cid=51640910}}</ref>