Download - Wolfram Research

54 2. Tutorial
In[2]:= commonEmitterAmplifier=
Circuit[
Netlist[
{V1, {1, 0}, inputVoltage},
{VCC, {2, 0}, Type −> VoltageSource,
Value −> supplyVoltage},
{R1, {2, 1}, R1},
{R2, {1, 0}, R2},
{RC, {2, 3}, RC},
{RE, {4, 0}, RE},
{Q1, {1 −> "B", 3 −> "C", 4 −> "E"},
Model −> NPNTransistor, Selector −> BJTModel}
],
Model[
Name −> NPNTransistor,
Selector −> ACsimple,
Ports −> {"B", "C", "E"},
Definition −>
Netlist[
{RB, {"X", "E"}, RB},
{CC, {"B", "X", "C", "E"}, beta}
]
],
Model[
Name −> NPNTransistor,
Selector −> ACdynamic,
Ports −> {"B", "C", "E"},
Definition −>
Netlist[
{RB, {"X", "E"}, RB},
{CM, {"B", "C"}, CM},
{CC, {"B", "X", "C", "E"}, beta},
{RO, {"C", "E"}, RO}
]
]
]
Out[2]= Circuit
Note that in the top-level netlist of this circuit description we used a generic subcircuit selector
BJTModel and not ACsimple or ACdynamic. This allows us to select the model at run time by
replacing BJTModel with ACsimple or ACdynamic just before the subcircuit hierarchy is expanded.
In addition, for reasons which will become apparent in the next section, we have used the variables
inputVoltage and supplyVoltage to denote the values of the voltage sources V1 and VCC.
Remember that the Type directive in the value field of VCC prevents Analog Insydes from falsely interpreting
the netlist entry as belonging to a voltage-controlled current source.