The output impedance of a standard transistor is characterized as____________?
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Answer: A. high
Explanation
Standard bipolar transistors have their output taken from the collector circuit, which contains a reverse-biased PN junction. A reverse-biased semiconductor junction naturally presents a very high opposition to current flow in the output loop. This high output impedance characteristic allows the transistor to drive subsequent stages effectively without loading down. Bipolar junction transistors operate by controlling large collector currents through small base current variations. The output characteristics curves show nearly flat collector current lines over a wide range of collector-emitter voltages. High output impedance is a fundamental hallmark of active semiconductor devices configured for signal amplification.
Zero output impedance would represent an ideal voltage source rather than the physical reality of a transistor. Low output impedance is characteristic of emitter follower circuits rather than standard common emitter amplifiers. Very low is an understatement for standard transistor output impedance, which typically measures in tens of kiloohms.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
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