مرکز منطقه ای اطلاع رساني علوم و فناوري - The Gain and Stability of Linear Two-Port Amplifiers

DocumentCode :

1204302

Title :

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 ${y \\ast }_{21}/SG_u$ .