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Design Languages >> Verilog-AMS >> Recording Data in DC sweep
https://designers-guide.org/forum/YaBB.pl?num=1182433992

Message started by makelo on Jun 21^st, 2007, 6:53am

Title: Recording Data in DC sweep
Post by makelo on Jun 21^st, 2007, 6:53am

How does one write data to a text file in a DC sweep? I have attached the code I frequently use for writing data in transient analysis. It works great. The difference is that in a DC sweep I can't use the @timer function. If I use a similar code in a DC sweep without the timer line then I just get one data point. Can someone suggest modifications that will record the entire DC sweep?

-------------------------------------------------------------------
`include "disciplines.vams"
`include "constants.vams"

module sink1(v1);
electrical v1; //node voltage to write
parameter string file_name = "filename.tbl"; //file name to write to
//strings only work in some versions of verilogA
//hardcode the filename if necessary
parameter real T_step = 1e-9; //time step for writing data.
parameter real T_off = 0; //time to wait before starting
integer file_ptr; //pointer to file_name

analog begin
@( initial_step ) begin
file_ptr=$fopen(file_name);
end

@(timer(T_off,T_step)) begin //at each T_step write the node voltage
$fwrite(file_ptr, "%e %e\n", $abstime, V(v1));
end

@ (final_step) begin
$fclose(file_ptr);
end
end
endmodule
-------------------------------------------------------------------

Title: Re: Recording Data in DC sweep
Post by Geoffrey_Coram on Jun 21^st, 2007, 10:13am

You could write an if statement that tests if the current point is a multiple of, say 0.1V, and then $strobe the output. Or just $strobe it all the time and tell your simulator what steps you want it to take.