The Gain and Stability of Linear Two-Port Amplifiers

Author

Scanlan, J.O. ; Singleton, J.S.

Volume

Issue

fYear

1962

fDate

9/1/1962 12:00:00 AM

Firstpage

240

Lastpage

246

Abstract

In this paper the problem of obtaining maximum gain at a given stability factor is considered. It is assumed that the terminations and the complex feedback $(y_{12})$ are variable by means of passive networks, and it is shown that for matching terminations the maximum gain, for a given stability factor $S$ , is $(S + 1/S)^{2} G_{u}$ , where $G_u$ is the unilateralized gain. The optimum value of $y_{12}$ is ${S y \\ast }_{21}/(S + 1)^2 G_u$ . It is further shown that if there is a free choice of terminations, their optimum values are the complex conjugates of the shortcircuit input and output admittances. In this case the gain is given by $(S/S - 1)^2 G_u$ . The optimum value of $y_{12}$ is ${y \\ast }_{21}/SG_u$ .

Keywords

Bandwidth; Circuit stability; Equations; Feedback; Frequency; Helium; Laboratories; Passive networks; Physics; Tuned circuits;

fLanguage

English

Journal_Title

Circuit Theory, IRE Transactions on

Publisher

ieee

ISSN

0096-2007

Type

jour

DOI

10.1109/TCT.1962.1086921

Filename

1086921

Link To Document

https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1204302