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| In [[electronics]], the '''Gummel plot''' is the combined [[Mathematics|plot]] of the base and collector [[electric current]]s, <math>I_c</math> and <math>I_b</math>, of a [[Bipolar junction transistor|bipolar transistor]] vs. the base-emitter [[voltage]], <math>V_{be}</math>, on a semi-[[logarithmic scale]]. This plot is very useful in device characterization because it reflects on the quality of the emitter-base [[Junction (semiconductor)|junction]] while the base-collector bias, <math>V_{bc}</math>, is kept at a [[Constant (mathematics)|constant]].
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| A number of other device parameters can be garnered either [[Quantitative property|quantitative]]ly or [[qualitative data|qualitative]]ly directly from the Gummel plot:<ref>A. S. Zoolfakar et N. A. Shahrol, « Modelling of NPN Bipolar Junction Transistor Characteristics Using Gummel Plot Technique », in 2010 International Conference on Intelligent Systems, Modelling and Simulation (ISMS), 2010, p. 396 ‑400</ref>
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| * the common-emitter current gain, <math>\beta</math>, and the common-base current gain, <math>\alpha</math>
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| * base and collector ideality factors, <math>n</math>
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| * series [[electrical resistance|resistance]]s and [[leakage current]]s.
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| Sometimes the DC current gain, <math>\beta</math>, is plotted on the same figure as well.
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| [[File:SiGe HBT Gummel Plot.png|thumb|SiGe HBT Gummel Plot]]
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| ==See also==
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| *[[Hermann Gummel]]
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| *[[Bipolar junction transistor]]
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| ==References==
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| <references /> | |
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| {{DEFAULTSORT:Gummel Plot}}
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| [[Category:Transistors]]
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| [[Category:Plots (graphics)]]
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| {{Electronics-stub}}
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Revision as of 18:02, 9 February 2014
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