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3.8 Pole/Zero Analysis 311
Examples
Load Analog Insydes.
Read in a PSpice netlist
and small-signal data.
Set up a system of AC
equations.
Calculate the poles of the
circuit.
In[1]:= AC]
Out[3]= DAEAC, 18 18
In[4]:= PolesByQZ[mnabuffer]
Out[4]=
1.93945 10 11 , 3.51956 10 10 , 279586. 2.89305 10 6 ,
279586. 2.89305 10 6 , 3.20148 10 6 , 3.22422 10 6 ,
2.26133 10 9 , 1.31955 10 10 , 6.86928 10 9 , 8.83669 10 9
3.8.5 ZerosByQZ
ZerosByQZ[dae, var]
calculates the zeros of the transfer function from the AC
DAEObject dae to the output variable var
Command structure of ZerosByQZ.
To calculate the zeros of a linear circuit, the coefficient matrix of the corresponding system of circuit
equations must be decomposed into a matrix pencil A B. ZerosByQZ performs this decomposition
and calls GeneralizedEigenvalues to compute the zeros numerically. The argument dae must be
an AC DAEObject written in matrix form (see CircuitEquations in Section 3.5.1).
Calculating zeros requires the circuit to be a single-input system, i.e. the circuit must be
excited by a single AC input source.
Note that this function is accessible only if the global Analog Insydes option UseExternals is set to
True and if a native version of the external MathLink module QZ.exe is available for your machine
(see Section 3.13.4).
See also: PolesAndZerosByQZ (Section 3.8.3), PolesByQZ (Section 3.8.4),
UseExternals (Section 3.14.7).
Examples
Load Analog Insydes.
In[1]:=