In a common emitter transistor circuit, the emitter base junction and the collector base junction are respectively
Correct answer: A. forward biased and reverse biased
- A. forward biased and reverse biased
- B. both forward biased
- C. both reverse biased
- D. reverse biased and forward biased
Explanation
Forward bias on the emitter base junction injects carriers into the thin lightly doped base, and the reverse biased collector base junction then sweeps almost all of them across, which is what produces the current gain. Biasing both junctions forward drives the transistor into saturation, the fully on switch state, and both reverse gives cut off. Correct biasing is the first requirement of any amplifier design.
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About PN Junction
A PN junction forms when p type and n type semiconductor regions meet, creating a depletion layer and a potential barrier. The topic covers forward and reverse bias, diode current voltage characteristics, breakdown and rectification, while distinguishing an ordinary junction diode from a transistor formed from multiple junctions.
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