99. Applications of feedback in amplifier circuits (Part-C)
The chapter explores the applications of feedback in amplifier circuits, focusing on the effects of current-series feedback on amplifier performance. It presents the methodology for defining trans-conductance in feedback networks, the significance of bypass capacitors, and the impact of input and output resistance on circuit behavior. Through practical insights and examples, it underscores how feedback influences gains and resistances within amplifier circuits.
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Sections
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What we have learnt
- Current-series feedback increases input and output resistance.
- Bypass capacitors can stabilize the DC operating point while allowing AC signals.
- Feedback configurations affect the trans-conductance and overall performance of the amplifier.
Key Concepts
- -- Transconductance (G_m)
- The measure of the current output relative to the voltage input in an amplifier circuit, critical for assessing the amplifier's efficiency.
- -- Feedback Factor (β)
- The ratio of output signal to input signal, significant in determining how feedback influences amplifier parameters.
- -- Desensitization Factor (D)
- A scalar factor that represents the reduction in gain due to feedback, affecting both input and output resistance.
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