Comments on "A deterministic approach for designing conditionally stable amplifiers"

For original paper see M.L. Edwards et al., ibid., vol.43, no.7, pp.1567-75 (July 1995). In the above paper, the authors presented a careful analysis of single-sided matched conditionally stable amplifiers. In particular, they determined a maximum single-sided matched gain G/sub msm/ which is reached for passive jointly stable source (load) terminations G/sub msm/=2 kG/sub ms/ where k is the Rollett´s stability factor and G/sub ms/=|S/sub 21//S/sub 12/| is the maximum stable gain of device. However, at least some of the results presented in the above paper can be found in other literature. In this paper, I would like to outline the formerly published papers treating conditionally stable amplifiers in terms of the scattering parameters. A reply by the original authors is included.