Why does collector current increase with base current in BJT?
The base current in the BJT is due to the recombination of holes and electrons. If we take it the other way round, the larger the base current the greater is the recombination, so the collector current should reduce, but Beta Ic/Ib. …
Why the base current is very small?
Few electrons injected by the emitter into the base of an NPN transistor fall into holes. Most of the emitter current of electrons diffuses through the thin base into the collector. Moreover, modulating the small base current produces a larger change in collector current.
How does base current increase and collector current decrease at?
Universität Paderborn. Hi, An increase in base current means more bias to the transistor which further means collector current will also increase but till the limiting value of the transistor parameters. However, if you try to push more current to the base, collector current would no more increase but the transistor may break down.
What is the dependency of current gain on collector current in BJT?
Beta/ hfe (both are actually different quantities) varies with variation in collector current.
How is the collector-base junction reverse biased?
Coming to the answer constraining to the PNP discussion, by providing the reverse bias at the collector w.r.t. emitter (-Vce = Vec = Veb + Vbc), the collector – base junction is reverse biased. The reverse biased CB junction Before answering the question, I would like to mention some basic information that will help the further discussion.
Why is the B-E diode forward biased?
The much heavier doping concentration of the emitter makes the emitter current much larger than the base current when the emitter-base junction is forward biased. Please, note that, for an active mode operation, the B-E diode is forward biased. This is graphically shown below.