Patent ID: 7671450

Claim:
An integrated circuit package comprising: a chip having a circuit thereon; a multi-segment transmission line transformer having a first port and a second port, the first port coupled the circuit; and a via stack adapted to electrically couple the second port to a printed circuit board; wherein the circuit is adapted to provide an impedance (Zc) and the via stack has an impedance (Zv), and wherein the transformer is adapted to convert the impedance of the circuit to an impedance that combined with the impedance of the via stack has an impedance approximately that of a desired impedance (Zt); wherein the transmission line transformer comprises: a middle segment; a first end segment coupled between the first transformer port and the middle segment; and a second end segment coupled between the second transformer port and the middle segment; and wherein the first end segment has a characteristic impedance of approximately |Zt+Zv|, the second end segment has a characteristic impedance of approximately |Zc|, and the middle segment has a characteristic impedance between the characteristic impedances of the first and second end segments.