Question
Download Solution PDFThe output and input voltages of an emitter-follower have a phase difference of _______.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe phase shift between the input and output of an emitter follower is 0o.
Emitter follower:
- The Emitter-follower circuit is also known as a common collector configuration.
- It is called the emitter follower configuration because the emitter voltage follows the base voltage.
- It is mostly used as a voltage buffer.
- The small-signal model & hybrid model is shown below:
All the configurations are used in different circuits based on their applications:
|
Parameters |
Common-Emitter (CE) |
Common-Base (CB) |
Common-Collector (CC) |
|
Input resistance |
Moderate |
Low |
High |
|
Output resistance |
High |
High |
Low |
|
Voltage gain |
High |
High |
About 1 |
|
Current gain (β ) |
High |
Low, about 1 |
High (1+β ) |
|
Power gain |
High |
Moderate |
Low |
|
A phase shift between input and output. |
1800 |
00 |
00 |
|
Applic-ation |
Voltage amplifier, audio frequency applica-tions. |
Current buffer, high-frequency applica-tions |
Voltage buffer, impedance matching |
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