Patent ID: 8008987
Filing Date: 2011-08-30
Classification: H01P,H03H

Abstract:
1. A Balun circuit manufactured by integrate passive device (IPD) process, comprising: a substrate; a first coplanar spiral structure having a first end, a second end, a plurality of first left coils, a plurality of first right coils and a first bridge, wherein one end of the innermost first left coil is electrically connected to the innermost first right coil through a first bridge, the first end is electrically connected to the outermost first left coil, and the second end is electrically connected to the outermost first right coil; and a second coplanar spiral structure having a third end, a fourth end, a plurality of second left coil, a plurality of second right coil and a second bridge, wherein one end of the innermost second left coil is electrically connected to the innermost second right coil through the second bridge, the third end is electrically connected to the outermost second left coil, and the fourth end is electrically connected to the outermost second right coil; wherein the first left coils and the second left coils are interlaced, and the first right coils and the second right coils are interlaced; wherein the substrate has a first wiring layer and a second wiring layer, the first left coils and the first right coils are disposed on the first wiring layer, the first bridge is disposed on the second wiring layer.