Abstract
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.
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