I am trying to run a simple simulation to calculate the amount of charge that passes through a simple device and am getting a "jacobian" error.

The code that I am using is very simple as follows:


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

module res1(out,in);
inout out,in;
electrical out,in;
real i,charge,finalcur;

analog begin
i= I(out,in);
charge = idt(i);
finalcur = ddt(charge);
end
endmodule


The stimulus is a simple voltage source with 1mOhm resistance connected in series to voltage source. This is then applied to the veriloga block I have designed.

and the error that I am getting is zero found in diagonal of Jacobian.

Any guesses what am I doing wrong ?
How can I calculate the amount of charge that is passing through a device ?

Perfect !!

It works !!