gummel plot

In electronics, the Gummel Plot is the combined plot of the currents

I_c

and

I_b

of a 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: the d.c. gain, b; base and collector ideality factors, nIb and nIc; series resistances and leakage currents. See also: Hermann Gummel

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