// importing libs
`include "discipline.h"

module diff_amp(
  output electrical out, 
  input electrical in1,
  input electrical in2);

(* desc="gain", units="", type="instance" *)   parameter real gain = 40 from [-inf: inf];
(* desc="amplitude", units="", type="instance" *)    parameter real amplitude = 3 from [-inf: inf];
(* desc="offset", units="", type="instance" *) parameter real offset = 1.5 from [-inf: inf];

analog begin

    V(out) <+ offset + amplitude / 2 * tanh( gain / amplitude * 2 * V(in1, in2));

end
endmodule