93. Feedback system (Part-D)
This chapter delves into the analysis of feedback systems in analog electronic circuits, focusing on the output resistance changes associated with various feedback configurations. Key sections cover voltage and current amplifiers, detailing how output resistance is influenced by different factors such as source resistance and feedback network characteristics. The importance of recognizing ideal versus non-ideal conditions is emphasized throughout the chapter to ensure accurate circuit analysis.
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What we have learnt
- Output resistance varies significantly based on feedback configuration and conditions.
- Non-ideal factors, such as finite input and output resistances, critically affect circuit performance.
- Understanding the principles of feedback can enhance the design and analysis of electronic circuits.
Key Concepts
- -- Output Resistance
- The equivalent resistance seen by the load connected to the output of a circuit, which influences the voltage gain.
- -- Feedback Configuration
- The arrangement of feedback in an amplifier which can be classified as series or shunt depending on how the feedback signal is combined with the input signal.
- -- Voltage Amplifier
- An amplifier that primarily increases the voltage level of a signal, typically characterized by its high input resistance and low output resistance.
- -- Current Amplifier
- An amplifier designed to increase the current level of a signal, usually involving feedback in a shunt configuration.
- -- TransImpedance Amplifier
- An amplifier that converts input current to output voltage, often used in sensor applications.
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