Patent ID: 6661306
Filing Date: 2003-12-09
Classification: H03H

Abstract:
A dual-balun formed on a substrate, said dual-balun comprising:four inductors symmetrically disposed in a rectangular area on the substrate, each inductor including an electrical winding having a first end and a second end, wherein a first inductor and a second inductor are positioned adjacent to each other at one side of the rectangular area and a third inductor and a fourth inductor are positioned adjacent to each other at an opposite side of the rectangular area so that a circuit area including circuit elements is defined between the pair of the first and second inductors and the pair of the third and fourth inductors in a central portion of the rectangular area; and a first output trace electrically coupled to the first end of the first inductor in the circuit area, a second output trace electrically coupled to the first end of the second inductor in the circuit area, a third output trace electrically coupled to the first end of the third inductor in the circuit area and a fourth output trace electrically coupled to the first end of the fourth inductor in the circuit area, wherein the first, second, third and fourth output traces extend through the circuit area between the second and fourth inductors, and wherein an output signal on the first output trace is out of phase with an output signal on the second output trace and an output signal on the third output trace is out of phase with an output signal on the fourth output trace.