Download - Wolfram Research

3.5 Setting Up and Solving Circuit Equations 251
DerivativePostfix
If symbol names denoting derivates of varibles have to be created during linearization, the value
of the DerivativePostfix option is appended to the variable name. Thus, the value of the
DerivativePostfix option has to be a string which can be converted to a valid Mathematica
symbol. The default setting is DerivativePostfix −> "d".
FrequencyVariable
The option FrequencyVariable specifies the symbol denoting the complex Laplace frequency. If set
to Automatic, the value of the option FrequencyVariable as stored in the DAEObject dae is used.
The default setting is FrequencyVariable −> Automatic.
OperatingPointPostfix
If the given operating point list oppoint contains a rule of the form var −> value, the rule opvar −> value
is added to the DesignPoint option of the returned DAEObject, where opvar is given by appending
the value of the OperatingPointPostfix option to the variable name var. Thus, the value of the
OperatingPointPostfix option has to be a string which can be converted to a valid Mathematica
symbol. The default setting is OperatingPointPostfix −> "$op".
Examples
Load Analog Insydes.
Define netlist description
of a simple diode rectifier
circuit.
Set up transient equation
system.
In[1]:= 2. Sin[10^6 Time]},
{R1, {2, 0}, Symbolic −> R1, Value −> 100.},
{C1, {2, 0}, Symbolic −> C1, Value −> 1.*^−7},
{D1, {1 −> A, 2 −> C},
Model −> "Diode", Selector −> "Spice",
GMIN −> 0, AREA −> 1}
]
]
Out[2]= Circuit
In[3]:= tran = CircuitEquations[rectifier,
ElementValues −> Symbolic,
AnalysisMode −> Transient,
Value −> {"*" −> {TEMP, TNOM, $q, $k, AREA, GMIN}}]
Out[3]= DAETransient, 4 4