12 Questions
In a Common Emitter amplifier, what is the polarity of the output voltage with respect to the input voltage?
Inverted
What is the primary function of a Common Collector amplifier?
Impedance matching and current amplification
What is the primary advantage of using a Darlington Pair?
Higher current gain
In a Common Base amplifier, what is the AC ground point?
Base
What characteristic is common to both Common Emitter and Common Collector amplifiers?
Low output impedance
What is the main characteristic that makes the Common Emitter amplifier suitable for amplifying low-level signals?
High current gain and voltage gain
What is the primary application of a Darlington Pair?
High-current applications
Which BJT amplifier configuration is commonly used for impedance matching and voltage buffering?
Common Collector (CC) amplifier
What is the main advantage of using a Common Base amplifier in high-frequency amplification?
High voltage gain and low input impedance
Which amplifier configuration is commonly used in audio amplifiers, and why?
Common Emitter (CE) amplifier, due to its high voltage gain and current gain
What is the main characteristic of the Common Collector amplifier that makes it suitable for voltage regulators?
High current gain and low output impedance
Which amplifier configuration has the highest voltage gain among the three common BJT amplifier configurations?
Common Emitter (CE) amplifier
Study Notes
BJT Amplifier Circuits
Common Emitter (CE) Amplifier
- Most common BJT amplifier configuration
- Provides voltage gain, but not current gain
- Emitter is at AC ground
- Collector voltage is amplified and inverted
- Base voltage is input signal
- Characteristics:
- Voltage gain: moderate to high
- Current gain: low
- Input impedance: high
- Output impedance: low
Common Collector (CC) Amplifier (Emitter Follower)
- Used for impedance matching and current amplification
- Emitter voltage follows base voltage
- Collector is at AC ground
- Base voltage is input signal
- Characteristics:
- Voltage gain: near unity
- Current gain: high
- Input impedance: high
- Output impedance: low
Common Base (CB) Amplifier
- Used for impedance matching and voltage amplification
- Base is at AC ground
- Emitter voltage is amplified and inverted
- Collector voltage is input signal
- Characteristics:
- Voltage gain: high
- Current gain: low
- Input impedance: low
- Output impedance: high
Darlington Pair
- Two BJTs connected in a configuration to increase current gain
- Alpha (α) of the pair is higher than a single BJT
- Used in high-current applications
- Characteristics:
- High current gain
- High input impedance
- Low output impedance
Test your knowledge of different BJT amplifier configurations, including Common Emitter, Common Collector, Common Base, and Darlington Pair amplifiers. Learn about their characteristics, applications, and uses in electronic circuits.
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