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3.5 Setting Up and Solving Circuit Equations 229
3.5 Setting Up and Solving Circuit Equations
Setting up a system of equations from a netlist description of a circuit is the central step of most circuit
analysis problems you will solve with Analog Insydes. All types of equations can be set up using the
command CircuitEquations (Section 3.5.1). Additionally, there are the commands ACEquations
(Section 3.5.2) and DCEquations (Section 3.5.3) which transform a nonlinear dynamic equation
system into a linear and static equation system, respectively. In order to solve systems of equations
symbolically, Mathematica’s built-in function Solve has been extended to handle DAEObjects as well
(see Section 3.5.4).
3.5.1 CircuitEquations
CircuitEquations[netlist, opts]
CircuitEquations[circuit, opts]
sets up a system of circuit equations from a netlist
description
sets up a system of circuit equations from a circuit
description
Command structure of CircuitEquations.
The first argument of CircuitEquations must be a Circuit or Netlist object. If it is not a flat
netlist, then ExpandSubcircuits will be called first automatically to expand any subcircuit or device
model references. CircuitEquations sets up modified nodal, sparse tableau, or extended sparse
tableau equations for AC, DC, or transient analysis. CircuitEquations returns a DAEObject.
The type and appearance of equations generated with CircuitEquations can be changed with the
following options: