An integrated transformer comprising a primary coil and a secondary coil, the primary coil comprising a first subsection and a second subsection, the first subsection extending in a different plane to a plane in which the second subsection extends, the planes spaced from one another, the secondary coil comprising a first subsection and a second subsection, the first subsection extending in a different plane to a plane in which the second subsection extends, the planes spaced from one another, wherein the first subsection of the primary coil is stacked with the second subsection of the secondary coil and the second subsection of the primary coil is stacked with the first subsection of the secondary coil.