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Gummel–Poon model : ウィキペディア英語版
Gummel–Poon model

The Gummel–Poon model is a model of the bipolar junction transistor. It was first described in a paper published by Hermann Gummel and H. C. Poon at Bell Labs in 1970.〔H. K. Gummel and H. C. Poon, "An integral charge control model of bipolar transistors", ''Bell Syst. Tech. J.'', vol. 49, pp. 827–852, May–June 1970〕
The Gummel–Poon model and modern variants of it are widely used via incorporation in the popular circuit simulators such as SPICE. A significant effect that the Gummel–Poon model accounts for is the variation of the transistors' \beta_\mathrm and \beta_\mathrm values with the direct current level. When certain parameters are omitted, the Gummel–Poon model reduces to the simpler Ebers–Moll model.〔
==Model parameters==

Spice Gummel–Poon model parameters
〔http://virtual.cvut.cz/dynlabmodules/ihtml/dynlabmodules/semicond/node48.html Summary of model with schematics and equations〕

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