Necessary and sufficient conditions for the stability of microwave amplifiers with variable termination impedances

New criteria to check conditional stability of microwave amplifiers with input and output terminations varying in pre-specified circular regions surrounding complex nominal values are proposed. Necessary and sufficient conditions are provided both in terms of the immittance parameters /spl lambda//s...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2005-08, Vol.53 (8), p.2580-2586
Main Authors: Olivieri, M., Scotti, G., Tommasino, P., Trifiletti, A.
Format: Article
Language:English
Subjects:
Amplifiers
Applied sciences
Circuit properties
Circuit stability
Computer aided design
Computer-aided design (CAD)
conditional stability
Constraint optimization
Criteria
Design automation
Design optimization
Distributed amplifiers
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Impedance
Microwave amplifiers
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwaves
MMICs
monolithic microwave integrated circuit (MMIC)
Optimization
Scattering parameters
Stability
Stability criteria
Sufficient conditions
yield
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Summary:New criteria to check conditional stability of microwave amplifiers with input and output terminations varying in pre-specified circular regions surrounding complex nominal values are proposed. Necessary and sufficient conditions are provided both in terms of the immittance parameters /spl lambda//sub ij/ (i.e., z/sub ij/,y/sub ij/,g/sub ij/, or h/sub ij/) and in terms of the scattering parameters s/sub ij/. Proposed conditions can be easily implemented in any commercial computer-aided design tool and are suitable to be used as design goals within an optimization routine: this allows to optimize the tradeoff between stability constraints under termination variations and performance in a yield-oriented design flow. A case study, in which a distributed amplifier has been designed, shows the advantages of the proposed approach.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2005.852759