Model Engineering in Mixed-Signal Circuit Design by S. Huss

By S. Huss

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1) denotes the DAE of a block featuring free input and output quantities and respectively, in addition to branch quantities. This forms the basis for mixed causal/acausal specifications. Eq. 4) as introduced for the description of a behavioral model is then just a subset of Eq. 1). 1 or Fig. 8 may be combined into one entity according to Eq. 1). Modeling of analog behavior is supported in quite different ways and is demonstrated by the simple circuit example depicted in Fig. 15. Fig. 15b) denotes its description in SPICE syntax.

These relationships are then mapped accordingly to single or multiple value-controlled sources. Because of the considerable work having been done in this area over the past 20 years or so [CC92], macro modeling is still a common modeling approach in integrated circuit design practice as will be demonstrated in Chapter 6. Its relevance, however, is expected to decrease in the years to come. The generic macro level model of an operational amplifier — the fundamental building block of many analog and mixed-signal circuits — as depicted in Fig.

2 on the right side. Several architectures can now be defined and exploited for this entity in VHDL, whereby the designer may choose the best suitable architecture for her or his purposes without having to face restrictions or changes in the functionality. 1 Behavior Behavior specification corresponds with an algorithm that produces quasirandom sequences by calculating a primitive polynomial with coefficients of modulo 2 within an infinite loop as defined in Fig. 3. 2 35 Data flow If the specification is to be orientated towards the data flow in the block, a feedback is constructed with three guarded signal assignments as given in Fig.

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