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

Volume

54

Issue

4

fYear

2007

fDate

4/1/2007 12:00:00 AM

Firstpage

298

Lastpage

302

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;

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2006.889713

Filename

4155056