March 2014
Intermediate to advanced
624 pages
26h 33m
English
Content preview from Solid State Electronic Devices, 7th EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Summary
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7.1 A BJT consists of an emitter-base (EB) diode connected back to back to a collector-base (CB) diode. In the normal active mode of operation, the EB junction is forward biased such that carriers injected from the emitter can diffuse across the narrow base and be collected by the reverse-biased CB junction.
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7.2 The terminal currents can be determined by solving the drift–diffusion and continuity equations for a narrow-base diode with suitable boundary conditions. The fraction of the total emitter current that is due to injected carriers from emitter to base is the emitter injection efficiency and is made close to unity by doping the emitter much higher than the base. Another elegant way to increase emitter injection efficiency is to ...
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