An analysis of the problem of noise parameter determination is carried out. It is found that the mathematical problem is ill-posed if all the source reflection coefficients (Γs) used in the measurements fall onto a line, circle or are of a circle in the Smith chart. This is used to expand on existing criteria for selecting Γ s and to rule out sources of accuracy degradation
CitationO'Callaghan, J.; Alegret, A.; Pradell, L.; Corbella, I. Ill conditioning loci in noise parameter determination. Electronics letters, 1996, vol. 32, núm. 18, p. 1680-1681.
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