Model Order Reduction of Frequency-Dependent Interconnect Models Via Linear Fractional Transformation Techniques

This paper presents a linear fractional transformation (LFT)-based approach to handle model order reduction (MOR) of interconnect models with frequency-dependent (FD) parameters. Conventional MOR schemes are not readily applicable to FD interconnects as they are restricted to models with constant state-space matrices. Motivated by this limitation, we propose an LFT-based MOR framework directly applicable to FD interconnect models. The key idea of the proposed method is to transform the transfer function of an FD interconnect model into an LFT which is then directly reduced. Effectiveness of the proposed approach is confirmed by numerical examples