98. Applications of feedback in amplifier circuits (Part-B)
Feedback in amplifier circuits, specifically the common emitter amplifier, is crucial for stabilizing trans-impedance. By utilizing feedback networks, both input and output resistances can be optimized while preserving performance metrics such as voltage and current gain. Various configurations determine the effectiveness of feedback, leading to distinct operational characteristics within amplifier circuits.
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What we have learnt
- Feedback can stabilize the trans-impedance of amplifiers, enhancing performance.
- The choice of feedback configuration affects input and output resistances significantly.
- Analyzing feedback effects helps predict changes in various amplifier parameters, aiding in practical circuit design.
Key Concepts
- -- Transimpedance
- The relationship between the output voltage and the input current in an amplifier, typically used in the context of feedback amplifiers.
- -- Feedback Network
- A circuit element that samples and returns a portion of the output signal back to the input to control the amplifier's performance.
- -- Common Emitter Amplifier
- A widely used amplifier configuration that employs a transistor, exhibiting high voltage gain and moderate input and output resistance.
- -- Loading Effect
- The effect on circuit performance when connecting another component, influencing resistance and signal levels.
- -- Thevenin Equivalent
- A simplification of a complex circuit into a simple equivalent circuit with a single voltage source and resistance.
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