66. Multi-Transistor Amplifiers : Amplifier With Active Load (Part A)
The chapter delves into the functionalities and advantages of amplifiers with active loads, specifically focusing on common emitter and common source amplifiers. It explains the limitations of traditional amplifiers using passive loads, particularly the voltage gain constraints, and introduces techniques to enhance gain through active loads. The discussion includes circuit analysis, operational characteristics, and design considerations for achieving improved performance in analog electronic circuits.
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What we have learnt
- Amplifiers with active loads replace passive loads with transistors to improve voltage gain.
- The voltage gain of common emitter and common source amplifiers can be significantly enhanced by utilizing active loads.
- Understanding the operating principles and limitations of amplifiers is crucial for effective circuit design.
Key Concepts
- -- Active Load
- A circuit configuration where a transistor is used instead of a passive resistor to increase the voltage gain of an amplifier.
- -- Voltage Gain
- The ratio of the output voltage to the input voltage in an amplifier, indicating how much the amplifier increases the signal.
- -- Common Emitter Amplifier
- A type of BJT amplifier where the emitter is common to both the input and output, providing significant voltage gain.
- -- Common Source Amplifier
- A type of FET amplifier where the source terminal is common to both input and output, characterized by lower voltage gain compared to common emitter configurations.
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