By Dan FitzPatrick, Ira Miller

Analog Behavioral Modeling With The Verilog-A Language presents the IC fashion designer with an advent to the methodologies and makes use of of analog behavioral modeling with the Verilog-A language. In doing so, an summary of Verilog-A language constructs in addition to functions utilizing the language are offered. additionally, the publication is followed through the Verilog-A Explorer IDE (Integrated improvement Environment), a restricted strength Verilog-A more desirable SPICE simulator for extra studying and experimentation with the Verilog-A language. This publication assumes a easy point of figuring out of using SPICE-based analog simulation and the Verilog HDL language, even though any programming language historical past and a bit decision should still suffice.
From the Foreword:
`Verilog-A is a brand new layout language (HDL) for analog circuit and structures layout. because the mid-eighties, Verilog HDL has been used commonly within the layout and verification of electronic structures. notwithstanding, there were no analogous high-level languages on hand for analog and mixed-signal circuits and structures.
Verilog-A offers a brand new size of layout and simulation potential for analog digital platforms. formerly, analog simulation has been dependent upon the SPICE circuit simulator or a few spinoff of it. electronic simulation is essentially played with a description language corresponding to Verilog, that's well known because it is straightforward to benefit and use. Making Verilog extra useful is the truth that numerous instruments exist within the that supplement and expand Verilog's functions ...
Behavioral Modeling With the Verilog-A Language offers an excellent advent and foundation for college kids and training engineers with curiosity in realizing this new point of simulation expertise. This ebook comprises quite a few examples that increase the textual content fabric and supply a invaluable studying instrument for the reader. The textual content and the simulation application incorporated can be utilized for person examine or in a school room surroundings ...'
Dr. Thomas A. DeMassa, Professor of Engineering, Arizona country collage

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The designer is free to choose the level of abstraction within the structural or behavioral components of the definition of the module. Once a module is defined, it can be instantiated as a child module within a parent module definition or as a top-level component in the design. The behavioral description is done in a programmatic fashion in the Verilog-A language within the analog statement or block of the module. The analog block encapsulates the behavioral description, or the mathematical relationships between input signals and output signals.

A branch is a path of flow between two nodes. Every branch has an associated potential (the 26 Verilog-A HDL Types of Analog Systems potential difference between the two branch nodes), and a flow. The reference directions for a branch are as follows: The reference direction for a potential is indicated by the plus and minus symbols at each end of the branch. Given the chosen reference direction, the branch potential is positive whenever the potential of the branch marked with a (+) sign is larger than the potential of the branch marked with a minus (–) sign.

The mathematical validity and stability of the formulation of a model are important issues to consider when developing a behavioral model, particularly during the test and validation of the model. 3 Statements for Behavioral Descriptions In the Verilog-A language, all analog behavior descriptions are encapsulated within the analog statement. The analog statement encompasses the contribution statement(s) that are used to define the relationships between the input and output signals of the module.

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