Unconditional Stability Analysis of N-Port Networks Based on Structured Singular Value Computation
Abstract
In this paper, a novel approach based on robust stability concepts and tools is introduced to evaluate the unconditional stability of microwave active n-port devices. An efficient calculation of the Structured Singular Value of the nxn scattering matrix is proposed to obtain the stability characteristics of the device. The presented method is validated in two ways. First, it is applied to a referential 4x4 scattering parameter set for independent verification. Second, the method is applied to a 4-port GaAs FET amplifier fabricated in hybrid technology. The results confirm the validity and computational efficiency of the proposed approach.
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