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Gummel plot

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Gummel plot
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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 constant.

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SiGe HBT Gummel plot

A number of other device parameters can be garnered either quantitatively or qualitatively directly from the Gummel plot:[1]

Sometimes the DC current gain, , is plotted on the same figure as well.

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