Patent ID: 6307457
Filing Date: 2001-10-23
Classification: H01F

Abstract:
A planar transformer comprising:a plurality of insulating layers;a first coil formed on a first layer of said plurality of insulating layers, said first coil having a first central winding portion and a first extending portion, said first extending portion outwardly extending from said first central portion and surrounding a first via; anda second coil formed on a second layer of said plurality of insulating layers, said second coil having a second central winding portion and a second extending portion, said second extending portion outwardly extending from said second central portion and surrounding a second via;wherein said first via and said second via are located outside said first central winding portion and said second central winding portion, and wherein one of said first via and said second via connects said first extending portion to said second extending portion, said first coil and said second coil being located on different planes.