Patent ID: 6603383
Filing Date: 2003-08-05
Classification: H01F,H03H

Abstract:
A multilayer, balanced-unbalanced signal transformer comprising:a first coil and a second coil providing at least one balanced signal port at one side of the balun transformer and an unbalanced signal port at another side of the balun transformer, the at least one balanced signal port being provided by a first balanced signal terminal and a second balanced signal terminal formed by the ends of the first coil; the unbalanced signal port being provided by a first unbalanced signal terminal and a second unbalanced signal terminal, wherein the balun transformer is a discrete component formed on a low resistivity substrate layer; the first and second coils are formed in a first and a second metal layer such that at least a portion of one of the coils is disposed in a metal layer above the metal layer in which at least a portion of the other coil is disposed, wherein between said first and second metal layers and between said second metal layer and the substrate layer, the first and second dielectric layers are disposed; and each of the first and second coils has no more than three winding turns.