76. Differential Amplifier : Basic Structure and Principle of Operation (Contd.)
The chapter provides a comprehensive analysis of the differential amplifier's structure and operation, focusing on its basic principles using BJTs. Key aspects include the understanding of differential and common mode gains, along with modifications to enhance performance through alternative configurations. Insights into circuit analysis and application are also presented, with attention on small signal equivalents and their impact on differential amplification.
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What we have learnt
- The differential amplifier can be analyzed through its BJT structure to understand its operational capabilities.
- Differential and common mode gains are critical parameters that define the performance of differential amplifiers.
- Modification of resistor configurations and the implementation of active devices can significantly enhance differential amplifier performance.
Key Concepts
- -- Differential Amplifier
- A circuit that amplifies the difference between two input voltages, providing high gain for the difference and rejecting common signals.
- -- Common Mode Gain
- The amplification provided by a circuit to inputs that are in phase, which ideally should be minimized in a differential amplifier.
- -- Differential Mode Gain
- The amplification provided by a circuit to the difference between two input signals, crucial for the effective functioning of differential amplifiers.
- -- BJT (Bipolar Junction Transistor)
- A type of transistor that uses both electron and hole charge carriers, widely used in amplification stages.
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