On-chip millimeter wave Lange coupler

A balanced amplifier, comprising:

• a first Lange coupler structured to divide an input signal fed into the first Lange coupler into two signals and structured to output the two signals with a phase shift to each other;
• a plurality of amplifiers structured to amplify the two signals;
• a second Lange coupler structured to reverse the phase shift of the two signals and to combine the amplified two signals output from the plurality of amplifiers in phase, wherein each of the first and second Lange couplers includes:
• a first plurality of lines on a first level;
• and
• a second plurality of lines on a second level, each of the second plurality of lines on the second level corresponding with a line from the first plurality of lines on the first level;
• wherein at least two lines on the first level are coupled to at least two lines on the second level, wherein each of the at least two lines on the first level is coupled to at least one non-corresponding line on the first level and at least one non-corresponding line on the second level, and
• wherein the coupling of the at least two lines on the first level to the at least two lines on the second level form at least two sets of shorted lines extending between the first level and the second level, a first set of shorted lines having an end in the first level and an opposite end in the second level, a second set of shorted lines having an end in the first level and an opposite end in the second level, the coupling of the first set of shorted lines to the first level and the second level forming a cross-coupling configuration with the coupling of the second set of shorted lines to the first level and the second level.