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bipolar transistor

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(electronics)bipolar transistor - A transistor made from a sandwich of n- and p-type semiconductor material: either npn or pnp. The middle section is known as the "base" and the other two as the "collector" and "emitter". When used as an amplifying element, the base to emitter junction is in a "forward-biased" (conducting) condition, and the base to collector junction is "reverse-biased" or non-conducting. Small changes in the base to emitter current (the input signal) cause either holes (for pnp devices) or free electrons (for npn) to enter the base from the emitter. The attracting voltage of the collector causes the majority of these charges to cross into and be collected by the collector, resulting in amplification.

Contrast field effect transistor.
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They revealed then that a type of superfast, high-current transistor known as a heterojunction bipolar transistor can emit useful amounts of infrared light.
Lighthearted transistor: electronic workhorse moonlights as laser by Weiss, P. / Science News
The divide-by-2 and divide-by-4 circuits were designed by BAE Systems and manufactured in Vitesse's second generation Indium Phosphide Heterojunction Bipolar Transistor process (VIP-2(TM)).
Vitesse sets industry record--152 GHz circuit performance by EDP Weekly's IT Monitor
The Company also uses a variety of process technologies using GaAs substrates including hetrojunction bipolar transistor (HBT) and pseudomophic high electron mobility transistor (pHEMT).
TriQuint Semiconductor, Inc. Presents at Cowen Technology Conference by Business Wire
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