44. Common Collector and Common Drain Amplifiers - Part B
The chapter focuses on the analysis of common collector and common drain amplifiers, highlighting their roles as voltage mode buffers. Key discussions include output resistance, input capacitance, and voltage gain approximation, demonstrating that both configurations maintain a high input impedance and low output impedance while achieving a voltage gain close to one. Practical implications and theoretical concepts are explored to show how these amplifiers operate efficiently in electronic circuits.
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What we have learnt
- Common collector and common drain amplifiers act as buffers for voltage mode amplification.
- Output resistance in these configurations is low, while input impedance is high.
- Input capacitance remains low despite load influences in realistic circuit models.
Key Concepts
- -- Common Collector Amplifier
- An amplifier configuration where the output is taken from the emitter, providing high input impedance and low output impedance, making it suitable for buffering applications.
- -- Common Drain Amplifier
- Similar to the common collector, it serves as a voltage buffer, maintaining high input impedance and low output impedance while providing a voltage gain close to one.
- -- Miller's Theorem
- A technique used to analyze the effect of capacitance in amplifiers, allowing simplification of input and output capacitance effects in circuit design.
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