Stability Criterion for Two-Port Network With Input and Output Terminations Varying in Elliptic Regions

Author

Marietti, Piero ; Scotti, Giuseppe ; Trifiletti, Alessandro ; Viviani, Giorgio

Author_Institution

Dept. of Electron. Eng., Univ. of Rome "La Sapienza

Volume

54

Issue

12

fYear

2006

Firstpage

4049

Lastpage

4055

Abstract

New criteria to check the conditional stability of microwave amplifiers with input and output terminations varying in prespecified elliptic regions surrounding complex nominal values are proposed. Necessary and sufficient conditions are provided in terms of the immittance parameters lambda_ij (i.e., z_ij, y_ij, g_ij, or h_ij): these conditions can be implemented in commercial computer-aided design tools and are suitable to be used as design goals within optimization routines. Since elliptic shapes accurately fit the real variability region of input and output terminations, the proposed criterion allows to impose stability in the actual tolerance range of terminations and therefore to improve the tradeoff between performance and stability under termination variations

Keywords

MMIC; circuit stability; elliptic equations; microwave amplifiers; two-port networks; computer-aided design tools; conditional stability; elliptic shapes; immittance parameters; microwave amplifiers; monolithic microwave integrated circuit; prespecified elliptic regions; stability criterion; two-port network; Circuit stability; Design automation; Design optimization; Distributed amplifiers; Impedance; MMICs; Microwave integrated circuits; Shape; Stability criteria; Sufficient conditions; Computer-aided design (CAD); conditional stability; monolithic microwave integrated circuit (MMIC); yield;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2006.885883

Filename

4020472