A bond wire transformer comprises a plurality of primary bond wires (1) coupled in parallel; and a plurality of secondary bond wires (4) coupled in parallel, each secondary bond wire (4) being spaced apart from and oriented relative to a corresponding primary bond wire (1) so as to achieve a desired mutual inductance between the corresponding primary (1) and secondary (4) bond wires, thereby providing magnetic coupling between the primary (1) and secondary (4) bond wires.