Download - Wolfram Research

28 1. A Short Introduction
Analog Insydes 2 netlist
fragment
amplifier = Circuit[
Netlist[
{V1, {1, 0}, Symbolic −> V1,
Value −> {AC −> 1, DC −> 2.5,
Transient−>SinWave[Time, 2.5, 0.1, 1000]}},
{Q1, {2 −> C, 1 −> B, 3 −> E},
Model−>Model[BJT, NDEF, Q1],
Selector −> Selector[BJT, NDEF, Q1],
Parameters −> Parameters[BJT, NDEF, Q1],
GM$ac −> 0.02, RPI$ac −> 5.0*10^3, },
],
ModelParameters[Name −> NDEF, Type −> NPN,
IS −> 10^−16, BF −> 100, BR −> 1, VAF −> 150],
GlobalParameters[TEMP −> 300, GMIN −> 10^−12]
]
Circuit Equations
In Analog Insydes 1, symbolic circuit equations and corresponding numerical information (design
point, initial conditions, etc.) were not handled in a consistent fashion. To prevent errors due
to potentially inconsistent data and to provide a unified and more user-friendly mechanism for
managing all additional data associated with a system of symbolic circuit equations, the internal
representation of circuit equations was fundamentally changed in version 2. Now, all equation setup
and circuit analysis functionality is centered around a common data structure, the DAEObject.
A DAEObject is generated by means of the command CircuitEquations. It represents a linear
or nonlinear system of differential-algebraic equations (DAE) along with numerical data needed for
numerical analysis or symbolic approximation. In addition, a DAEObject contains information about
the type of equations it represents (AC/DC/transient, MNA/STA) plus a snapshot of all relevant
option settings taken at the point of time when the equations were set up. This data encapsulation
approach ensures the consistency of all data belonging to a particular circuit analysis context and
reduces the number of parameters that need to be passed to functions which operate on circuit
equations.
Interfaces
Analog Insydes 2 provides several new or improved modules for interfacing with commercial circuit
design environments. Platform-independent netlist converters with small-signal data and modelcard
import functionality are now available for a variety of widely used circuit simulators, including
Eldo, PSpice, and Saber. Waveforms can be imported from Eldo, PSpice, and Saber data files. Circuit
schematics can be imported into Mathematica via a DXF file converter. Moreover, Analog Insydes 2
features a model writer which is capable of generating behavioral model templates (e.g. Saber MAST)
automatically from a DAEObject.