High performance mixer structures for monolithic microwave integrated circuits

摘要

Mini-microstrip and mini-coplanar transmission lines are formed on a ship substrate with two metal layers. Together with a ground plane on the underside of the substrate, the lines are connected to form a Marchand balun. Two baluns, a quarter-wave transmission line and a diode quad are combined on a chip to form an MMIC mixer, and a par of mixers are combined with 90° and 180° splitters to provide circuits with superior rejection of specific spurious signals as well as RF and LO leakage over.