Title :
Resistance of Feedback Amplifiers: A Novel Representation
Author :
Amico, Arnaldo D. ; Falconi, Christian ; Giustolisi, Gianluca ; Palumbo, Gaetano
Author_Institution :
Dipt. di Ingegneria Elettronica, Universita Roma Tor Vergata, Rome
fDate :
4/1/2007 12:00:00 AM
Abstract :
We propose a representation and a related methodology for evaluating the exact input and output resistances of feedback amplifiers. Our approach is based on the generalization of the Rosenstark theorem. Indeed, it requires the computation of two resistances (direct and asymptotic) each one evaluated in one of the two ideal and extreme conditions of the return ratio (zero or infinity). Due to these characteristics, the representation allows one to understand what happens to a feedback amplifier resistance in the case of absence of feedback or in the ideal case of infinite feedback
Keywords :
feedback amplifiers; network analysis; Rosenstark theorem generalization; asymptotic resistance; circuit analysis; circuit modeling; circuit theory; direct resistance; feedback amplifiers resistance; feedback circuits; infinite feedback; input resistance; output resistance; zero feedback; Circuit analysis; Circuit theory; Equations; Feedback amplifiers; Feedback circuits; H infinity control; Impedance; Microelectronics; Transfer functions; Writing; Circuit analysis; circuit modeling; circuit theory; feedback amplifiers; feedback circuits;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2006.889713
