Orthogonal functions: Difference between revisions
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Fixed major omission: added Fourier analysis, which started the study. Sin and Cos are by far the most common orthogonal functions |
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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]]. | |||
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> | |||
* the common-emitter current gain, <math>\beta</math>, and the common-base current gain, <math>\alpha</math> | |||
* base and collector ideality factors, <math>n</math> | |||
* series [[electrical resistance|resistance]]s and [[leakage current]]s. | |||
Sometimes the DC current gain, <math>\beta</math>, is plotted on the same figure as well. | |||
[[File:SiGe HBT Gummel Plot.png|thumb|SiGe HBT Gummel Plot]] | |||
==See also== | |||
*[[Hermann Gummel]] | |||
*[[Bipolar junction transistor]] | |||
==References== | |||
<references /> | |||
{{DEFAULTSORT:Gummel Plot}} | |||
[[Category:Transistors]] | |||
[[Category:Plots (graphics)]] | |||
{{Electronics-stub}} | |||
Revision as of 17:49, 5 March 2013
In electronics, the Gummel plot is the combined plot of the base and collector electric currents, and , of a bipolar transistor vs. the base-emitter voltage, , on a semi-logarithmic scale. This plot is very useful in device characterization because it reflects on the quality of the emitter-base junction while the base-collector bias, , is kept at a constant.
A number of other device parameters can be garnered either quantitatively or qualitatively directly from the Gummel plot:[1]
- the common-emitter current gain, , and the common-base current gain,
- base and collector ideality factors,
- series resistances and leakage currents.
Sometimes the DC current gain, , is plotted on the same figure as well.
See also
References
- ↑ 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