Variation in the effective width of the base in a bipolar junction transistor
Figure 1. Top: NPN base width for low collector–base reverse bias; Bottom: narrower NPN base width for large collector–base reverse bias. Hashed areas are depleted regions.2. The Early voltage (VA) as seen in the output-characteristic plot of a BJT.
The Early effect, named after its discoverer James M. Early, is the variation in the effective width of the base in a bipolar junction transistor (BJT) due to a variation in the applied base-to-collector voltage. A greater reverse bias across the collector–base junction, for example, increases the collector–base depletion width, thereby decreasing the width of the charge carrier portion of the base.
The Earlyeffect, named after its discoverer James M. Early, is the variation in the effective width of the base in a bipolar junction transistor (BJT)...
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} where Vth is the threshold voltage. This approximation ignores the Earlyeffect (channel length modulation), among other things. In practice, this technique...
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