97. Applications of feedback in amplifier circuits (Part-A)
Feedback configurations play a crucial role in the stability and performance of amplifiers, with various types including voltage sampling and series mixing. Understanding the characteristics and consequences of these configurations allows for optimal deployment in BJT and op-amp circuits. This chapter emphasizes the importance of selecting appropriate feedback networks to achieve desired circuit properties, including stabilization of gain and resistance.
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What we have learnt
- The four primary feedback configurations in amplifiers: voltage-shunt, current-shunt, voltage-series, and current-series.
- The effect of negative feedback on amplifiers, including how it can reduce gain and stabilize output.
- The significance of selecting appropriate feedback networks based on the desired amplifier characteristics and practical considerations without sacrificing performance.
Key Concepts
- -- Negative Feedback
- A process in which a portion of the output signal of an amplifier is fed back to the input to improve stability and reduce gain.
- -- Feedback Factor (β)
- A parameter that indicates the portion of the output signal that is fed back to the input in a feedback loop.
- -- Desensitization Factor
- The factor by which the gain of an amplifier is reduced due to negative feedback, often expressed as (1 + βA).
- -- BJT Amplifier
- A type of amplifier that uses a Bipolar Junction Transistor (BJT) as the active component.
- -- OpAmp Configuration
- A circuit configuration using an operational amplifier, typically for applications such as inverting, non-inverting, integrator, and differentiator circuits.
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