| 摘要 |
<p>Two baluns (56, 64), a quarter-wave transmission line (74) and a diode quad (72) are combined on a chip to form an MMIC mixer, and a pair of mixers are combined with 90 degree and 180 degree splitters to provide circuits with superior rejection of specific spurious signals as well as reduced RF and LO leakage. The two baluns (56, 64) comprise mini-microstrip and mini-coplanar transmission lines formed on the chip substrate with two metal layers. Together with a ground plane on the underside of the substrate, the lines are connected to form Marchand baluns (56, 64).</p> |
