44. Common Collector and Common Drain Amplifiers - Part A
This chapter discusses Common Collector and Common Drain Amplifiers, focusing on their operations, biasing, and performance parameters. It highlights the motivations behind using these configurations to mitigate the limitations of common emitter and common source amplifiers. Key aspects include the analysis of voltage gain, input and output impedances, and input capacitances.
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What we have learnt
- Common Collector and Common Drain Amplifiers serve as buffers to reduce loading effects in circuit designs.
- Key performance metrics include high input resistance, low output resistance, small input capacitance, and voltage gain approximately equal to 1.
- Understanding biasing arrangements is crucial for the proper functioning of these amplifier configurations.
Key Concepts
- -- Common Collector Amplifier
- A BJT configuration that provides a high input resistance and a low output resistance, allowing for effective voltage buffering.
- -- Common Drain Amplifier
- A MOSFET configuration similar to the common collector that offers high input resistance and low output resistance, functioning as a voltage buffer.
- -- Buffer
- A circuit arrangement that isolates different stages of an amplifier to prevent loading effects and preserve signal integrity.
- -- Voltage Gain
- The ratio of output voltage to input voltage in an amplifier, ideally close to 1 for buffer applications.
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