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Verilog-AMS Analog Variables

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The way that Verilog-AMS manages its behavior in the analog domain is to define each equation in terms of a “branch.” Real variables can be defined directly to be used as intermediate variables; however, central to the concept is that of equations that define the through and across equations between two nodes. 

For example, if two nodes are defined as p and m, respectively, and are both of type electrical (i.e., the same type) then they can be connected via a branch definition of the voltage (across) and current (through) variables. 

For the voltage part of the branch, this is obtained using the following technique: 

1 / Voltage across pins p and m

2 V(p,m)

and similarly for the current:

1 / Current through pins p and m

2 I(p,m)

Using these basic definitions, equations can then be constructed in Verilog-AMS.

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