45. Common Collector and Common Drain Amplifiers (Contd.): Analysis (Part A)
The chapter focuses on the analysis of Common Collector and Common Drain Amplifiers, elaborating on the impacts of realistic biasing and associated components on their voltage gain, input capacitance, and output resistance. It compares idealistic assumptions with practical scenarios, evaluating how the introduction of additional resistances alters circuit characteristics. The content lays a solid foundation for understanding the behavior and design considerations of these essential amplifying configurations.
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What we have learnt
- The introduction of practical resistances affects the voltage gain and input capacitance of common collector and common drain amplifiers.
- Output resistance can be calculated considering parallel resistances, impacting the overall circuit performance.
- Simplifications can be made in certain aspects (like input capacitance being defined mainly by specific capacitors) when analyzing realistic circuits.
Key Concepts
- -- Common Collector Amplifier
- A type of amplifier configuration where the collector terminal is common to both input and output, providing high input impedance and low output impedance.
- -- Common Drain Amplifier
- An amplifier configuration similar to the common collector, but utilized primarily in MOSFET circuits where the drain is common to both input and output.
- -- Voltage Gain
- The ratio of the output voltage to the input voltage, indicating how much an amplifier increases the power of a signal.
- -- Input Capacitance
- The capacitance presented by the input terminals of the amplifier, which can affect frequency response and stability.
- -- Output Resistance
- The equivalent resistance seen from the output terminals of the amplifier, which affects the loading conditions and the signal delivered to the next stage.
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