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Knowledge
This chapter covers the effect of feedback on the frequency response of amplifiers, focusing on how the location of poles changes in feedback systems, particularly in amplifiers with one or more poles. The discussion emphasizes the significance of low-frequency gain, feedback network characteristics, and how these affect system stability and performance. Various cases illustrate the interaction between amplifier poles and feedback networks, leading to new pole locations in the feedback system.
Sections
References
Lecture 95.pdfClass Notes
Memorization
What we have learnt
- Feedback systems influence ...
- The stability of systems wi...
- The interaction between amp...
Final Test
Revision Tests
What we have learnt
- Feedback systems influence the frequency response of amplifiers by altering the location of poles.
- The stability of systems with negative feedback is maintained under certain conditions, ensuring linearity in behavior.
- The interaction between amplifier gain, feedback factor, and pole locations leads to changes in performance metrics such as gain and bandwidth.
Key Concepts
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Term: Frequency Response
Definition: The behavior of a system's output signal in relation to the frequency of the input signal.
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Term: Poles
Definition: Values of frequency in a system at which the output becomes infinite, significantly affecting the system's stability and response characteristics.
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Term: Feedback Network
Definition: A circuit framework that feeds a portion of the output back to the input, aiding in stabilizing or modifying the overall system response.
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Term: Loop Gain
Definition: The product of forward gain and feedback factor in a feedback loop, affecting system stability and response.
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Term: GainBandwidth Product
Definition: A constant value that indicates the trade-off between gain and bandwidth in amplifiers; it remains the same for both forward and feedback configurations.