55. Multi-Transistor Amplifiers: Operation and Analysis (Part A)
The chapter discusses multi-transistor amplifiers, focusing on the combination of different configurations to enhance performance. It highlights the common emitter, common collector, and common base configurations, each with their specific characteristics, advantages, and limitations. The interdependence of these configurations in achieving better input and output impedances is emphasized throughout the analysis.
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What we have learnt
- Multi-transistor amplifiers consist of combined configurations for improved overall performance.
- Output impedance can be decreased or input impedance increased by cascading different amplifier stages.
- Different amplifier configurations have their strengths in either voltage or current amplification, often requiring integration with other stages.
Key Concepts
- -- Common Emitter Amplifier (CE)
- A configuration known for its high voltage gain, potentially suitable for voltage mode amplification, but may require buffering for optimal performance.
- -- Common Collector Amplifier (CC)
- A configuration with low voltage gain but high input impedance that can act as a voltage buffer.
- -- Common Base Amplifier (CB)
- A configuration characterized by low input impedance and suitability for current mode amplification but limited voltage gain.
- -- Cascaded Configuration
- The arrangement of multiple amplifiers in sequence to achieve desired impedance characteristics and improved performance.
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