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46 2. Tutorial
In[16]:= cccseqs2 = CircuitEquations[
cccsCircuit2 /. {loadtype −> Resistor, loadval −> RL}];
DisplayForm[cccseqs2]
Out[17]//DisplayForm=
1
1
RB
CM s CM s
RB
1 0 0 V$1
CM s CM s 0 0 beta 1 V$2
1
1
RB
0
RB
0 1 0 V$3
.
⩵⩵
1 0 0 0 0 0 I$V0
0 0 1 0 0 0 IC$CC1
0 1 0 0 0 RL I$Load
In[18]:= Solve[cccseqs2, I$Load]
beta CM RB s V0
Out[18]= I$Load
RB 1 CM RL s
Next, we select a capacitive load CL and solve for the load current again.
0
0
0
V0
In[19]:= cccseqs3 = CircuitEquations[
cccsCircuit2 /. {loadtype −> Capacitor, loadval −> CL}];
DisplayForm[cccseqs3]
Out[20]//DisplayForm=
1
1
RB
CM s CM s
RB
1 0 0
CM s CM s 0 0 beta 1
1
RB
0
1
RB
0 1 0
1 0 0 0 0 0
0 0 1 0 0 0
0 1 0 0 0
In[21]:= Solve[cccseqs3, I$Load]
1
CL s
CL beta CM RB s V0
Out[21]= I$Load
CL CM RB
0
0
V$1
V$2
.
V$3
I$V0
⩵⩵
IC$CC1
I$Load
0
0
0
V0
0
0
InitialCondition
With the InitialCondition option (see Section 3.1.4), you can specify initial currents and voltages
for the dynamic elements Inductor (Section 4.2.6) and Capacitor (Section 4.2.5), respectively. If no
initial condition is given explicitly, it will be assumed to be zero (AC analysis) or will be calculated
automatically from the operating-point data (transient analysis).
As an example, we set an initial capacitor voltage of V0 for the netlist entry C1 of the following filter
circuit:
In[22]:= filter =
Netlist[
{V1, {1, 0}, V1},
{R1, {1, 2}, R1},
{C1, {2, 0}, Value −> C1, InitialCondition −> V0}
]
Out[22]= NetlistRaw, 3