Netlist description
The entry point for SimCAS is an electronic circuit defined in a netlist with the following syntax :
component <name>( @<node1>, @<node2>, ..., @<noden>, <value1>, <value2>, ..., <valuen> )
{
<component_name1> <instance_name1>( @<node1>, @<node2>, ..., @<noden>, <value1>, <value2>, ..., <valuen> );
<component_name1> <instance_name2>( @<node1>, @<node2>, ..., @<noden>, <value1>, <value2>, ..., <valuen> );
<component_name2> <instance_name1>( @<node1>, @<node2>, ..., @<noden>, <value1>, <value2>, ..., <valuen> );
...
<equations>
}
Example :
component voltage_divider {
V V1( @0, @2, 2 );
R R1( @2, @3, 100 );
R R2( @3, @0 );
}
@1,@2 and @0 are the circuit nodes.
This netlist describes a circuit composed of :
- a voltage source connected between node 0 and node 2 with a voltage of 2V.
- a resistor called R1 between node 2 and node 3 with a value of 200 ohms.
- a resistor called R2 between node 3 and node 0 with a default value of 100 ohms.
SimCAS parses this netlist, processes it and generates the following system of equations :
UR2+UV1+UR1=0 IR2-IV1=0 -IR1+IV1=0 2-UV1=0 100*IR1-UR1=0 100*IR2-UR2=0Then, it solves it as a CAS would do :
IV1=-0.01 IR2=-0.01 UR1=-1 UV1=2 UR2=-1 IR1=-0.01The components are described in library files ( with .cib extention ). Users can easily create their own components using symbolic definitions.