Lesson plan
Gummel plot
In electronics, the Gummel plot is the combined plot of the base and collector electric currents, I_\text{c} and I_\text{b} , of a bipolar transistor vs. the base–emitter voltage, 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_\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, \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.
Article summary
In electronics, the Gummel plot is the combined plot of the base and collector electric currents, I_\text{c} and I_\text{b} , of a bipolar transistor vs. the base–emitter voltage, 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_\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, \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.
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Discussion questions
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