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242 3. Reference Manual
Set up a system of
time-domain equations.
Change the branch current
prefix to "ib$".
Change the branch voltage
prefix to "ub$".
In[5]:= CircuitEquations[rlcf,
AnalysisMode −> Transient] // DisplayForm
Out[5]//DisplayForm=
V$1t V$2t
I$V1t ⩵⩵ 0,
R
V$1t V$2t
I$L1t ⩵⩵ 0, I$L1t C V$3 ′ t ⩵⩵ 0,
R
V$1t ⩵⩵ V, V$2t V$3t L I$L1 ′ t ⩵⩵ 0,
V$1t, V$2t, V$3t, I$V1t, I$L1t, DesignPoint
In[6]:= CircuitEquations[rlcf,
BranchCurrentPrefix −> "ib$"] // DisplayForm
Out[6]//DisplayForm=
1
R
1
R
0 1
V$1 0
1 1
R
R
1
L s
1
L s
0 V$2 0
. ⩵⩵
0
1 1
L s
L s
C s 0 V$3 0
1 0 0 0
ib$V1 V
In[7]:= CircuitEquations[rlcf, Formulation −> SparseTableau,
BranchVoltagePrefix −> "ub$"] // DisplayForm
Out[7]//DisplayForm=
1 1 1 1 0 0 0 0
0 0 0 0 1 1 0 0
0 0 0 0 0 1 1 0
0 0 0 0 0 0 1 1
1 0 0 0 0 0 0 0
0 1 0 0 0 R 0 0
0 0 1 0 0 0 L s 0
0 0 0 C s 0 0 0 1
ub$V1 0
ub$R1 0
ub$L1 0
.
ub$C1 0
⩵⩵
I$V1 V
I$R1
I$L1
I$C1
0
0
0
Do not convert R and L to
equivalent admittances.
In[8]:= CircuitEquations[rlcf,
ConvertImmittances −> False] // DisplayForm
Out[8]//DisplayForm=
0 0 0 1 1 0 V$1 0
0 0 0 0 1 1 V$2 0
0 0 C s 0 0 1 V$3 0
. ⩵⩵
1 0 0 0 0 0 I$V1 V
1 1 0 0 R 0
I$R1
0
0 1 1 0 0 L s I$L1 0
The DefaultSelector option allows you to choose a different set of device models than would be
normally used for the selected analysis mode. You can use this feature to set up circuit equations
for noise analysis. Noise equations are essentially AC equations with some extensions, that can be
included by selecting noise models instead of plain AC models using DefaultSelector −> Noise.
Read in a PSpice netlist
and small-signal data.
In[9]:= buffer = ReadNetlist[
"AnalogInsydes/DemoFiles/Buffer.cir",
"AnalogInsydes/DemoFiles/Buffer.out",
Simulator −> "PSpice"]
Out[9]= Circuit