Gummel plot

In electronics, the Gummel plot is the combined plot of the base and collector electric currents, $I_c$ and $I_b$ , of a bipolar transistor vs. the base-emitter voltage, $V_{be}$ , 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, $V_{bc}$ , 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, $\beta$ , and the common-base current gain, $\alpha$
base and collector ideality factors, $n$
series resistances and leakage currents.

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

SiGe HBT Gummel Plot

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

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Gummel plot

See also

References