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

module opa_fd0(inp, inn, outp, outn);

    inout inp, inn;
    inout outp, outn;
    
    electrical inp, inn, outp, outn;

    // dc differential gain
    parameter real GAIN = 10000;              

    analog begin
        V(outp)  <+  GAIN * V(inp, inn);
        V(outn)  <+  GAIN * V(inn, inp);
    end
    
endmodule