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Baseband modeling using multidimensional networks in VHDL-AMS

: Haase, J.

European Electronic Chips & Systems design Initiative -ECSI-, Gieres; TU Darmstadt:
Ninth International Forum on Specification and Design Languages. FDL 2006. Proceedings : Darmstadt University Germany, September 19-22, 2006
Gieres: ECSI, 2006
Forum on Specification & Design Languages (FDL) <9, 2006, Darmstadt>
Conference Paper
Fraunhofer IIS, Institutsteil Entwurfsautomatisierung (EAS) ()

Baseband models are widely used to describe the behavior of RF systems. They suppress the RF carrier. Thus, they are many times faster than passband models that evaluate every carrier cycle during the simulation. Nevertheless, passband models are at the latest necessary for the component design. To support the top-down design approach, consistent models at baseband and passband level are required. The paper shows how the consistency can be achieved using consequently the possibilities of overloading functions and operators in VHDL-AMS. The mathematical basis ist a consistent usage of the describing function theory for baseband modeling. The classical approach of baseband modeling can be extended by completing the waveforms that carry the in-phase and quadrature component by a time-discrete or time-continous waveform that saves the carrier frquency information. This allows to handle systems with different carries in different parts of a system or to sweep the carrier frequency during the simulation.