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1.3 What’s New 29
Modeling Language
As a consequence of the requirements identified during recent work on symbolic modeling and
analysis of nonlinear circuits, the behavioral modeling capabilities for nonlinear dynamic systems
were substantially extended. With the enhanced model description format of Analog Insydes 2, it
is now possible to designate model port nodes as optional, to specify default values for model
parameters as well as initial conditions and guesses for model variables, and to control how designpoint
information is generated for symbolic parameters of model equations.
Library Concept
Based on the modeling language extensions described above, a completely new device model library
concept was designed for Analog Insydes 2. Eldo and PSpice compatible models are available for R,
L, C, D, BJT, MOS, and JFET devices. Three model simplification levels can be selected when setting
up circuit equations to control the complexity of symbolic analysis.
Nonlinear Symbolic Analysis
Completely new functionality has been implemented for symbolic analysis and approximation of
nonlinear circuits. Based on a flexible user interface, the approximation routines allow an arbitrary
choice of analysis and error-control functions. In combination with the new model writer, Analog
Insydes 2 can be used for automated generation of nonlinear behavioral models.
Pole/Zero Analysis
Efficient numerical pole/zero and root locus analysis is now supported through two different
generalized eigenvalue problem solvers: an enhanced version of the QZ algorithm and a variant
of the Jacobi orthogonal correction method (JOCM). The introduction of the DAEObject concept
reduces the amount of parameters passed to functions. In addition, a new matrix-based method for
symbolic pole/zero analysis has been implemented. The algorithm simplifies a symbolic generalized
eigenvalue problem with respect to a selected root, using the JOCM for efficient iterative error
tracking.
User Interface
The use of Analog Insydes 2 has been considerably simplified by combining many frequently used
steps in powerful macro commands and providing more default actions. With as few as three
Analog Insydes commands it is possible to set up and run circuit analyses from Eldo, PSpice, or
Saber netlists. In addition, the external binaries (QZ algorithm, matrix approximation) have been
fully integrated into Analog Insydes 2 and can be used transparently like built-in commands.