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Section: Application Domains

Stability of high frequency amplifiers

Participants : Sébastien Fueyo, Jean-Baptiste Pomet, Laurent Baratchart [APICS project-team APICS (FACTAS as of 2018)] .

Nonlinear hyper-frequency amplifiers contain on the one hand nonlinear active components and on the other hand “lines”, that induce some sort of delays and make the system infinite-dimensional. Computer assisted design tools are extensively used. They provide frequency responses but fail to provide a reliable estimation of their stability, and this stability is crucial because an unstable response will not be observed in practice and the engineer needs to have this information between building the actual device. It is, of course, of utmost importance to find means to predict stability/instability from simulations in the Computer assisted design tool.

Sébastien Fueyo's PhD is co-advised between McTAO and APICS on this topic. It is an opportunity to build theoretical basis and justification to a stability analysis through harmonic identification; the latter is one of the specialties of APICS, we collaborate on the infinite-dimensional non-linear stability analysis for periodic solutions and how it works with the results of harmonic identification.

Potential transfer is important.