Abstract

The two solutions are used for mixed mode modelling: the system level modelling and the transistor level one. The both approaches are used through analogue-mixed signal designing. The VHDL-AMS (VHDL - Analogue & Mixed Signals) supplements the sequential and concurrent statements of VHDL-I076 with a new class of language statements for description of differential and algebraic equations. These are the simultaneous statements. Simultaneous statements contain ordinary VHDL expressions that can be evaluated in the ordinary way. The other way of modelling is based on transistor level solutions. It is necessary for practical design to be applicable requirements of models in the language imposed by the design objective to support a migration path for SPICE models.

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