Passive Spice Networks from Non-Passive Data

A new approach to passive SPICE network construction from disturbed and/or non-passive scattering parameters of general multiport device is presented. The passivity of the macromodel is restored using a mini-max optimization procedure with a goal function based on eigenvalues of Hamiltonian matrix of macromodel and nonlinear constrains. To illustrate its usefulness, the technique is applied to enforce passivity of multivariate surrogate models. The surrogates with passivity enforcement may become a powerful tool dedicated to design and optimization of RFIC devices, mixed digital-analog circuits and signal integrity analysis.