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Gummel plot

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Title: Gummel plot  
Author: World Heritage Encyclopedia
Language: English
Subject: Transistors, Gummel, Bipolar junction transistor
Collection: Plots (Graphics), Transistors
Publisher: World Heritage Encyclopedia

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

See also


  1. ^ 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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