50. Common Base and Common Gate Amplifiers : Analysis (Part B)
The chapter emphasizes the working principles of common base and common gate amplifiers, highlighting their roles as buffers in current mode amplification. It reviews the process of small signal analysis, detailing calculations for voltage gain, input impedance, output impedance, and current gain. Key insights into biasing schemes further enhance the understanding of these amplifier configurations.
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What we have learnt
- Common base and common gate amplifiers function as buffers in current mode amplifications.
- Understanding small signal analysis is crucial for calculating voltage gain, input impedance, output impedance, and current gain.
- Biasing schemes play a significant role in the operation of amplifiers.
Key Concepts
- -- Common Base Amplifier
- A type of amplifier configuration with low input resistance and high output resistance, primarily used for current amplification.
- -- Common Gate Amplifier
- Similar to the common base, it features low input resistance and serves to amplify current more effectively than voltage.
- -- Current Gain (α)
- The ratio of output current to input current in a transistor, indicating how much the transistor can amplify current.
- -- Voltage Gain
- The ratio of output voltage to input voltage, showing how much the amplifier can increase the amplitude of the input signal.
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