• Source: Gummel plot

In electronics, the Gummel plot is the combined plot of the base and collector electric currents,




I

c




{\displaystyle I_{\text{c}}}

and




I

b




{\displaystyle I_{\text{b}}}

, of a bipolar transistor vs. the base–emitter voltage,




V

be




{\displaystyle V_{\text{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




{\displaystyle V_{\text{bc}}}

, is kept constant.
A number of other device parameters can be garnered either quantitatively or qualitatively directly from the Gummel plot:

The common-emitter current gain,



β


{\displaystyle \beta }

, and the common-base current gain,



α


{\displaystyle \alpha }

,
Base and collector ideality factors,



n


{\displaystyle n}

,
Series resistances and leakage currents.
Sometimes the DC current gain,



β


{\displaystyle \beta }

, is plotted on the same figure as well.




See also


Hermann Gummel
Bipolar junction transistor
Gummel–Poon model




References

Kata Kunci Pencarian:

• Gummel plot
• Hermann Gummel
• Gummel
• Gummel–Poon model
• Bipolar junction transistor
• Margitta Gummel
• SPICE
• Field-effect transistor
• Bell Labs
• 1923