94. Feedback system (Part-E)
The chapter provides a comprehensive overview of feedback systems in analog electronic circuits, focusing on the voltage gain, input resistance, output resistance, and output voltage of feedback systems. It contrasts ideal and non-ideal feedback situations through numerical examples, illustrating how different parameters like gain and resistance interact in these contexts. Through various calculations, it emphasizes the impact of feedback on circuit performance, particularly in enhancing input resistance and modifying output resistance.
Enroll to start learning
You've not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take practice test.
Sections
Navigate through the learning materials and practice exercises.
What we have learnt
- Feedback systems can significantly alter the voltage gain, input resistance, and output resistance of a circuit.
- The desensitization factor plays a crucial role in determining the input and output characteristics of feedback systems.
- Understanding both ideal and non-ideal feedback conditions is essential for accurately designing and analyzing circuits.
Key Concepts
- -- Voltage Gain
- The ratio of output voltage to input voltage in an amplifier, indicating how much the amplifier boosts the input voltage.
- -- Input Resistance
- The resistance faced by an input signal at the input terminals of a circuit, which can be enhanced by feedback.
- -- Output Resistance
- The resistance seen by the load connected at the output of the circuit, which can also be modified by feedback.
- -- Desensitization Factor
- A factor that describes how feedback affects the sensitivity of various parameters in a feedback system, calculated as (1 + βA).
- -- Feedback Factor (β)
- The portion of the output voltage that is fed back to the input of the amplifier.
- -- Loop Gain
- The product of forward gain and feedback factor, indicating the overall effectiveness of feedback in a system.
Additional Learning Materials
Supplementary resources to enhance your learning experience.