In electronics, the Gummel plot is the combined plot of the base and collector electric currents, <math>I_\text{c}</math> and <math>I_\text{b}</math>, of a bipolar transistor vs. the base–emitter voltage, <math>V_\text{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 while the base–collector bias, <math>V_\text{bc}</math>, is kept constant.
A number of other device parameters can be garnered either quantitatively or qualitatively 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>,
- Template:AnchorBase and collector ideality factors, <math>n</math>,
- Series resistances and leakage currents.
Sometimes the DC current gain, <math>\beta</math>, is plotted on the same figure as well.
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