Compact lumped element dual highpass/lowpass balun layout

A dual-balun for providing two zero phase RF output signals and two 180° phase RF output signals, said dual-balun comprising:

• a monolithic substrate;
• four inductors symmetrically disposed on the substrate, each inductor including an electrical winding having an inner end and an outer end, wherein the inductors include a pair of a first inductor and a second inductor where the first and second inductors are positioned adjacent to each other and a pair of a third inductor and a fourth inductor where the third and fourth inductors are positioned adjacent to each other, wherein a circuit area is defined between the pair of the first and second inductors and the pair of the third and fourth inductors;
• and
• four capacitors disposed in the circuit area, wherein the inner end of each winding is electrically coupled to a capacitor in the circuit area by an air bridge formed by parallel portions of the winding of the inductor, and wherein the inner end of the first end inductor is electrically coupled to a first capacitor, the inner end of the second inductor is electrically coupled to a second capacitor, the inner end of the third inductor is electrically coupled to a third capacitor and the inner end of the fourth inductor is electrically coupled to a fourth capacitor.

A dual-balun for providing two zero phase RF output signals and two 180° phase RF output signals for a mixer, said dual-balun comprising:

• a monolithic substrate;
• four inductors symmetrically disposed on the substrate, each inductor including an electrical winding having an inner end and an outer end, wherein the inductors include a pair of a first inductor and a second inductor where the first and second inductors are positioned adjacent to each other and a pair of a third inductor and a fourth inductor, where the third and fourth inductors are positioned adjacent to each other, wherein a circuit area is defined between the pair of the first and second inductors and the pair of the third and fourth inductors;
• four capacitors disposed in the circuit area, wherein the inner end of each winding is electrically coupled to a capacitor in the circuit area by an air bridge formed by parallel portions of the winding of the inductor;
• and
• a first output trace electrically coupled to the outer end of the winding first inductor in the circuit area, a second output trace electrically coupled to the outer end of the winding of the second inductor in the circuit area, a third output trace electrically coupled to the outer end of the winding of the third inductor in the circuit area and a fourth output trace electrically coupled to the outer end of the winding of the fourth inductor in the circuit area, and wherein an output signal on the first output trace is 180° out of phase with an output signal on the second output trace and an output signal on the third output trace is 180° out of phase with an output signal on the fourth output trace, and wherein the first, second, third and fourth output traces are parallel to each other and extend through the circuit area between the second and fourth inductors.