Question
Download Solution PDFWhich amplifier circuit is used as an emitter follower circuit?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is option 3):(Common collector)
Concept:
- The common collector transistor circuit configuration gains its name from the fact that the collector circuit is common to both input and output circuits, the base is associated with only the input, and then the emitter with the output only.
- The other name for the common collector is emitter follower. This name is derived from the fact that the emitter voltage "follows" that of the base circuit - the circuit has unit voltage gain.
- The emitter follower transistor amplifier has a very straightforward circuit. The base is connected to the previous stage, and often this may be directly connected as this can save on additional bias resistors which lower the input impedance and hence increase the loading to the previous stage.
|
Common Emitter (CE) |
Common Collector (CC) |
Common Base (CB) |
|
|
Current gain (AI) |
High |
High |
Low (unity) |
|
Voltage gain (AV) |
High |
Low (unity) |
High |
|
Input resistance (Ri) |
Medium |
High |
Low |
|
Output resistance (R0) |
Medium |
Low |
High |
|
Phase change |
180° |
0° |
0° |
Last updated on Jul 18, 2025
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