By Sorin Alexander Huss
For the 1st time, this updated textual content combines the most problems with the description language VHDL-AMS aimed toward version illustration of mixed-signal circuits and structures, characterization tools and instruments for the extraction of version parameters, and modelling methodologies for exact high-level behavioural versions.
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Additional info for Model engineering in mixed-signal circuit design: a guide to generating accurate behavioral models in VHDL-AMS
Abstraction hierarchies and resulting properties of models represented at different abstraction levels are, therefore, discussed in this chapter. Analog components and digital modules are outlined first. Mixed-signal systems need a special view on the interaction of time-continuous and event-discrete signals. Therefore, a new abstraction hierarchy is presented for such systems in order to address this problem accordingly. , electronic components operating in both time- and value-continuous domains) has no such long tradition, and it is not yet as widely spread in the analog and mixedsignal circuit design community as its digital counterpart.
For instance, a testbench, which contains a stimulus for the LFSR, can invoke all three models without changing the overall behavior. The VHDL code of Fig. 6 shows how the data floworiented specification is instantiated in a testbench and is stimulated by a clock signal. 1-1999. These concepts of VHDL are summarized in the following: Model Representation 37 Model composition from communicating, concurrently active design entities. Strict separation of the unique interface description and the functional description(s) of an entity.
Causal modeling is highly appropriate in the conceptual phase of systems design when performing design space exploration under consideration of possible subsystem implementations in different engineering disciplines such as mechanical, electrical, and computer engineering, respectively. On the other hand, acausal descriptions are a prerequisite to the detailed design of systems 12 MODEL ENGINEERING IN MIXED-SIGNAL CIRCUIT DESIGN components aimed to be implemented in one discipline only. A consistent and transparent transition of models over this barrier between modeling concepts is a serious problem within the general design flow as depicted in Fig.