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3.5 Setting Up and Solving Circuit Equations 243
Set up a system of AC
equations.
Set up a system of AC
equations with noise
extensions.
Specify numerical
reference values for the
circuit parameters.
Retrieve design point from
DAEObject.
Define an RLC lowpass
filter circuit with
design-point information.
Set up a system of AC
equations with numerical
coefficients.
In[10]:= CircuitEquations[buffer, AnalysisMode −> AC,
Protocol −> {None, Notebook}]
> ExpandSubcircuits...
> Searching model libraries for model "BJT/AC".
> Loading model "BJT/AC" from library FullModels‘.
> Instantiating model "BJT/AC" for reference Q$T1.
> Instantiating model "BJT/AC" for reference Q$T3.
> Instantiating model "BJT/AC" for reference Q$T4.
> Instantiating model "BJT/AC" for reference Q$T5.
> Instantiating model "BJT/AC" for reference Q$T2.
Out[10]= DAEAC, 18 18
In[11]:= CircuitEquations[buffer, AnalysisMode −> AC,
DefaultSelector −> Noise, Protocol −> {None, Notebook}]
> ExpandSubcircuits...
> Searching model libraries for model "BJT/Noise".
> Loading model "BJT/Noise" from library FullModels‘.
> Instantiating model "BJT/Noise" for reference Q$T1.
> Instantiating model "BJT/Noise" for reference Q$T3.
> Instantiating model "BJT/Noise" for reference Q$T4.
> Instantiating model "BJT/Noise" for reference Q$T5.
> Instantiating model "BJT/Noise" for reference Q$T2.
Out[11]= DAEAC, 18 18
In[12]:= eqs = CircuitEquations[rlcf, DesignPoint −> {V −> 1.,
R −> 1000., L −> 0.001, C −> 2.2*10^−6}]
Out[12]= DAEAC, 4 4
In[13]:= GetDesignPoint[eqs]
Out[13]= V 1., R 1000., L 0.001, C 2.2 10 6
In[14]:= rlcf2 = Netlist[
{V1, {1, 0}, Symbolic −> V, Value −> 1.},
{R1, {1, 2}, Symbolic −> R, Value −> 1000.},
{L1, {2, 3}, Symbolic −> L, Value −> 0.001},
{C1, {3, 0}, Symbolic −> C, Value −> 2.2*10^−6}
]
Out[14]= NetlistRaw, 4
In[15]:= CircuitEquations[rlcf2,
ElementValues −> Value] // DisplayForm
Out[15]//DisplayForm=
0.001 0.001 0 1
0.001 0.001
1000.
s
1000.
V$1 0
s
0 V$2 0
0
1000. 1000.
s
s
2.2 10 6 . ⩵⩵
s 0 V$3 0
1 0 0 0
I$V1 1.