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=== Ideal negative feedback amplifier ===
[[File:Modified SFG for feedback amplifier.PNG|
[[File:Control parameter.PNG|
[[File:Signal flow graph for feedback amplifier.png|thumb|upright=1.0 |A signal flow graph for a nonideal [[negative feedback amplifier]] based upon a control variable ''P'' relating two internal variables: ''x<sub>j</sub>=Px<sub>i</sub>''. Patterned after D.Amico ''et al.''<ref name=Damico>
{{cite journal |title=Resistance of Feedback Amplifiers: A novel representation |author=Arnaldo D’Amico, Christian Falconi, Gianluca Giustolisi, Gaetano Palumbo |journal=IEEE Transactions on Circuits and Systems – II Express Briefs |url=http://piezonanodevices.uniroma2.it/wp-content/uploads/2013/04/Rosenstark.pdf |date=April 2007 |volume=54 |issue=4 |pages=298–302 |doi=10.1109/tcsii.2006.889713|citeseerx=10.1.1.694.8450 }}
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