Unconditional Stability Analysis of N-Port Networks Based on Structured Singular Value Computation

TL;DR

This paper introduces a robust stability analysis method for microwave n-port devices using structured singular value computation, providing an efficient way to evaluate unconditional stability with validation on real and simulated devices.

Contribution

A novel approach leveraging structured singular value analysis for unconditional stability assessment of n-port microwave devices is proposed, enhancing computational efficiency and validation methods.

Findings

Validated on 4x4 scattering parameters and a GaAs FET amplifier.

Confirmed the method's accuracy and efficiency.

Applicable to complex microwave device stability analysis.

Abstract

In this paper, a novel approach based on robust stability concepts and tools is introduced to evaluate the unconditional stability of microwave active $\textit{n}$-port devices. An efficient calculation of the Structured Singular Value of the $\textit{n}$x$\textit{n}$ 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.