75. Differential Amplifier : Basic Structure and Principle of Operation
The chapter delves into the fundamentals of differential amplifiers, covering their basic structure, operating principles, and key parameters such as differential mode gain and common mode gain. It highlights the importance of transistor realizations, both BJT and MOSFET, and discusses various configurations that enhance performance. Characterization techniques to determine gain values and the conditions necessary for ideal operation are also explored.
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What we have learnt
- Differential amplifiers play a crucial role in signal processing by amplifying the difference between two signals while rejecting common noise.
- The key parameters for differential amplifiers include differential mode gain, common mode gain, and their implications on circuit performance.
- Transistor implementations, such as BJT and MOSFET, determine the overall function and efficiency of differential amplifiers in practical applications.
Key Concepts
- -- Differential Mode Gain
- The gain of a differential amplifier when it amplifies the difference between its two input signals.
- -- Common Mode Gain
- The gain of a differential amplifier for signals that are common to both inputs.
- -- Transistor Realization
- Refers to the implementation of differential amplifiers using different types of transistors (BJT or MOSFET) and their configurations to achieve desired performance.
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