An integrated circuit based transformer (200), comprising: a primary winding (202) located in a winding layer, the primary winding having two primary terminals at a first side of the transformer (205, 206); a secondary winding (203) located in a winding layer, the secondary winding having two secondary terminals at a second side of the transformer (208, 209), the first and second sides located at different sides of the transformer; and a reference bar (204) located in a reference bar layer, the reference bar having a primary reference bar terminal (207) at the first side of the transformer, and having a secondary reference bar terminal (208) at the second side of the transformer. The reference bar is configured to provide a direct electrical connection between the first reference bar terminal and the second reference bar terminal.
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