Editing Bipolar junction transistor (section)

==== Gummel–Poon charge-control model ====
The Gummel–Poon model<ref>{{cite journal|doi=10.1002/j.1538-7305.1970.tb01803.x|title=An Integral Charge Control Model of Bipolar Transistors|journal=Bell System Technical Journal|volume=49|issue=5|pages=827–852|date=1970|last1=Gummel|first1=H. K.|last2=Poon|first2=H. C.}}</ref> is a detailed charge-controlled model of BJT dynamics, which has been adopted and elaborated by others to explain transistor dynamics in greater detail than the terminal-based models typically do.<ref>{{cite web|url=http://ece-www.colorado.edu/~bart/book/book/chapter5/ch5_6.htm#5_6_2|title=Bipolar Junction Transistors|access-date=August 10, 2016|archive-date=February 7, 2009|archive-url=https://web.archive.org/web/20090207001659/http://ece-www.colorado.edu/~bart/book/book/chapter5/ch5_6.htm#5_6_2|url-status=dead}}</ref> This model also includes the dependence of transistor <math>\beta</math>-values upon the direct current levels in the transistor, which are assumed current-independent in the Ebers–Moll model.<ref name=Sedra2>{{cite book |author1=A.S. Sedra |author2=K.C. Smith |title=Microelectronic Circuits |url=https://archive.org/details/microelectronicc00sedr_571 |url-access=limited |date=2004 |edition=5th |publisher=Oxford |location=New York |isbn=978-0-19-514251-8 |page=[https://archive.org/details/microelectronicc00sedr_571/page/n538 509] }}</ref>