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Necessary and Sufficient Conditions for the Stability of Microwave Amplifiers With Variable Termination Impedances

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4 Author(s)
Olivieri, N. ; Electron. Eng. Dept., Univ. of Rome "La Sapienza", Italy ; Scotti, G. ; Tommasino, P. ; Trifiletti, A.

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$lambda_ ij$(i.e.,$ z_ ij, y_ ij, g_ ij,$or$ h_ ij$) and in terms of the scattering parameters$ s_ 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.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:53 ,  Issue: 8 )