Question
Download Solution PDFWhich of the following shows the proper biasing of a PNP transistor?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFPNP Transistor
PNP transistor is a three-terminal device i.e. base, emitter, and collector.
The main function of the PNP transistor is amplification.
For amplification, the base and emitter junction must be forward bias, and the collector and emitter junction must be reverse bias.
Operating modes of transistor
|
Operating mode |
Base-Emitter Junction |
Collector-Emitter Junction |
Application |
|
Active |
Forward biased |
Reverse biased |
Amplifier |
|
Saturation |
Forward biased |
Forward biased |
ON switch |
|
Reverse active |
Reverse biased |
Forward biased |
Attenuator |
|
Cut-off |
Reverse biased |
Reverse biased |
OFF switch |
Additional Information
NPN Transistor:
- An NPN transistor is a Bipolar Junction Transistor consisting of two PN junctions in such as way that a P-type semiconductor sandwiching by two N-type Semiconductors.
- These back to back PN junction diodes are known as the collector-base junction and base-emitter junction.
- The base-emitter junction is always connected in forward bias in Active mode therefore it has a barrier voltage (VBE) of + 0.7 volts for Si and + 0.3 volts for Ge.
- The collector-base junction is always connected in reverse bias in Active mode.
- In this transistor, electrons are the majority carrier for the input current (IE) and holes are the minority carrier.
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