Question
Download Solution PDFThe transport factor in bipolar junction transistor is defined as:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFBipolar Junction Transistor
Bipolar Junction Transistor is a three-layer semiconductor device.
Three layers of a BJT transistor's Emitter, Base, and Collector are formed by sandwiching alternative P and N layers.
The emitter is a heavily doped region of the BJT transistor, providing the majority of carriers into the base region.
The base region is a thin, lightly doped region sandwiched between the emitter and collector.
The majority of carriers from the emitter pass through the base region and its flow can be externally controlled.
The Collector region is moderately doped.
Circuit diagram of BJT
The emitter current is the sum of the base and collector current.
\(I_E=I_B+I_C\)
Current Components of BJT Transistor
The Current Amplification factor, Base Transport Factor, and Emitter Injection Efficiency parameters show the performance of the transistor.
(a) Current Amplification Factor
It is the ratio of the collector current to the emitter current.
\(\alpha={I_C\over I_E}\)
(b) Emitter Injection Efficiency
It is the ratio of current due to emitter majority carriers to the total emitter current.
It defines the injection capability of an emitter. Heavily doped regions will have a high injection factor.
Last updated on May 8, 2025
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