25. Common Emitter Amplifier (Part B)
The chapter provides an in-depth analysis of the Common Emitter (CE) amplifier, focusing on its small signal equivalent circuit and voltage gain characteristics. It highlights the importance of biasing for sensitivity to transistor beta and discusses associated problems like thermal runaway. The derivations for voltage gains and the implications of various configurations are explored thoroughly.
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What we have learnt
- The CE amplifier's operating point is influenced significantly by the beta of the transistor.
- The sensitivity of the CE amplifier's operating point to transistor parameters can lead to distortion of signals.
- High-frequency behavior of the CE amplifier, including parasitic capacitances and the impact of varying temperatures on operation.
Key Concepts
- -- Common Emitter Amplifier
- A type of amplifier configuration that offers significant voltage gain, widely used in analog circuits.
- -- Small Signal Model
- An analytical tool that simplifies the behavior of an amplifier under small input conditions, facilitating easier calculations of important parameters like gain and impedance.
- -- Voltage Gain
- The ratio of output voltage to input voltage, an important parameter that indicates how much an amplifier boosts the signal.
- -- Thermal Runaway
- A situation where increases in thermal cycling lead to rising temperatures and further impacts on operation, particularly in amplifiers sensitive to transistor characteristics.
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