Tracing ELN Nodes (Voltages and Current)

[Samuel]

Hi,

According to the SystemC AMS User Guide 2020 (p.g. 92), 

Quote

For ELN models, voltage tracing is supported for nodes and terminals. Current tracing through ELN
primitive modules having two terminals is supported. Some simulators also support current tracing
through ELN primitive modules with more than two terminals.

Can I know how exactly this is done, with examples?

Many thanks in advance!

 

[Martin Barnasconi]

The SystemC AMS standard defines in section 9.1.2.6 (sca_util::sca_trace) that it can trace objects of type sca_traceable_object. Since all ELN primitives are derived of this type, you can simply trace the ELN component itself, see example below
 

SC_MODULE(eln_circuit)
{ 
  // node declaration
  sca_eln::sca_node n1;      // ELN node
  sca_eln::sca_node_ref gnd; // ELN ground

  // component declaration
  sca_eln::sca_vsource vin;
  sca_eln::sca_r       r1;

  // constructor including ELN netlist
  eln_circuit( sc_core::sc_module_name nm )
  : vin("vin", 0.0, 1.23), 
    r1("r1", 1e3)
  {
    // Only ELN primitives requires explicit timestep assignment to one element
    vin.set_timestep(1.0, sc_core::SC_MS);
 
    // netlist
    vin.p(n1);
    vin.n(gnd);
 
    r1.p(n1);
    r1.n(gnd);
  }
};


int sc_main(int argc, char* argv[])
{
  eln_circuit cir("eln_circuit");
  
  sca_util::sca_trace_file* tf = sca_util::sca_create_tabular_trace_file("trace.dat");
  sca_util::sca_trace(tf, cir.n1, "v_n1");
  sca_util::sca_trace(tf, cir.vin, "i_through_vin");
  sca_util::sca_trace(tf, cir.r1, "i_through_r1");

  sc_core::sc_start(1.0, sc_core::SC_MS);

  sca_util::sca_close_tabular_trace_file(tf);

  return 0;
}