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{{Short description|Model of electronic circuits involving transistors}}
'''Hybrid-Pi''' is a popular [[Electronic circuit|circuit]] model used for analyzing the [[small signal]] behavior of [[Bipolar junction transistor|bipolar junction]] and [[Field-effect transistor|field effect transistors]]. Sometimes it is also called '''Giacoletto model''' because it was introduced by [[Lawrence J. Giacoletto|L.J. Giacoletto]] in 1969.<ref>Giacoletto, L.J. "Diode and transistor equivalent circuits for transient operation" IEEE Journal of Solid-State Circuits, Vol 4, Issue 2, 1969 [http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=1049963&contentType=Journals+%26+Magazines&sortType%3Dasc_p_Sequence%26filter%3DAND%28p_IS_Number%3A22508%29]</ref> The model can be quite accurate for low-frequency circuits and can easily be adapted for higher frequency circuits with the addition of appropriate inter-electrode [[capacitance]]s and other [[Parasitic element (electrical networks)|parasitic elements]].
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