module V_single_differential_conv(inp,inm,outp,outm,ref);
 input inp,inm,ref;
 output oupt,outm;
 voltage inp,inm,ref,outp,outm,ref;

 parameter real gain=1;

 real vdiff;

 analog
 begin
   vdiff = V(inp,inm)*gain/2;
   V(outp,ref) <+  vdiff;
   V(outm,ref) <+ -vdiff;
 end
endmodule