Editing Function generator (section)

===Function generator===
An electronic circuit element that provides an output proportional to some mathematical function (such as the square root) of its input; such devices are used in [[feedback control]] systems and in [[analog computer]]s. Examples are the [[Raytheon]] QK329 square-law tube<ref>{{cite web |url=http://www.radiomuseum.org/forumdata/users/6435/file/varie/QK329_App.pdf |last1=Miller |first1=Joseph A. |last2=Soltes |first2=Aaron S. |last3=Scott |first3=Ronald E. |publisher=[[Electronics (magazine)|Electronics]] |date=February 1955 |title=''Wide-band Analog Function Multiplier'' |access-date=15 June 2013}}</ref> and the Intersil ICL8048 Log/Antilog Amplifier.<ref>{{cite web |url=http://www.intersil.com/content/dam/Intersil/documents/fn28/fn2864.pdf |publisher=[[Intersil]] |title=''Intersil ICL8048 Log Amplifier'' |access-date=16 June 2013}}</ref>