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2.2 Netlists 39
2.2.2 Circuit Elements
Element Types
Having learned the basics about the netlist format we will now take a look at the circuit element
types (see Chapter 4.2) which are supported by Analog Insydes. The names of all available types
are stored in a globally accessible list named ElementTypes (Section 3.1.5):
In[5]:= ElementTypes
Out[5]=
Resistor, Conductance, Admittance, Impedance, Capacitor,
Inductor, CurrentSource, VoltageSource, CCCSource, CCVSource,
VCCSource, VCVSource, Nullator, Norator, Fixator, OpAmp, OTAmp,
ABModel, OpenCircuit, ShortCircuit, SignalSource, Amplifier,
Integrator, Differentiator, TransmissionLine, TransferFunction
To obtain information about the netlist format for a particular circuit element, type element. This
will print the corresponding usage message to the screen. For example, let’s find out more about
the elements Capacitor (Section 4.2.5) and VCCSource (Section 4.2.13):
In[6]:= Capacitor
Capacitor (type tag "C") denotes a linear capacitor. The
netlist format is {Cname, {N1, N2}, value}. Network
equation setup for capacitors is influenced by the
value field option Pattern.
In[7]:= VCCSource
VCCSource (type tag "VC") denotes a linear
voltage−controlled current source. The netlist format
is {VCname, {C1, C2, N1, N2}, value}. Note that the
nodes of the controlling branch, C1 and C2, are listed
before those of the controlled branch, N1 and N2. As
compared to Spice, the order is reversed!
You may have noticed that there are no such elements as diodes, bipolar or MOS transistors contained
in ElementTypes.
Nevertheless, Analog Insydes comes with a predefined library of symbolic semiconductor device models (see
Chapter 4.3), which contains full-precision SPICE-compatible models for the most important devices such as
Diodes, BJTs, MOSFETs, and JFETs.
In addition to the linear electric circuit elements like resistors and capacitors the list of element types
contains six elements from control theory, namely signal sources, amplifiers, integrators, etc. This is
because Analog Insydes is capable of analyzing linear control circuits as well. You can even perform
symbolic analyses of systems which contain both electrical and control components, allowing you to
do behavioral circuit modeling across different levels of abstraction.