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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.

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.
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