The
drift-field transistor, also called the
drift transistor or
graded base transistor, is a type of high-speed
bipolar junction transistor having a
doping-engineered electric field in the base to reduce the
charge carrier base
transit time.
Invented by Herbert Kroemer at the Central Bureau of Telecommunications Technology of the German Postal Service, in 1953, it continues to influence the design of modern high-speed bipolar junction transistors.
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