68. Multi-Transistor Amplifiers : Amplifier With Active Load (Contd.) –Numerical Examples (Part A)
The chapter covers multi-transistor amplifiers with active loads, focusing on understanding numerical examples and inherent design guidelines. Key aspects include analyzing the operation of BJT and MOSFET versions of CE amplifiers, calculating small signal parameters, and observing the effects of various load configurations on amplifier performance. A comparative analysis highlights the advantages of using active loads in terms of gain and bandwidth when present alongside passive loads.
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What we have learnt
- Using active loads in amplifiers significantly enhances voltage gain.
- The output voltage, collector current, and other small signal parameters can be effectively calculated using the transistors' characteristics.
- There is a trade-off between gain and bandwidth when switching from passive to active load configurations.
Key Concepts
- -- Active Load
- An active load uses active components, typically transistors, to enhance the gain characteristics of an amplifier compared to passive loads.
- -- Voltage Gain
- The ratio of output voltage to input voltage for an amplifier, indicating how much the signal is amplified.
- -- Small Signal Parameters
- Parameters that describe the behavior of a transistor (such as transconductance and output resistance) in response to small input signals.
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