A 0.03mm2 highly balanced balun IC for millimeter-wave applications in 180-nm CMOS

Abstract

A miniaturized broadband balun IC in 180-nm CMOS is presented for millimeter-wave applications. The balun IC is designed so that high impedance ratio between the even and odd modes is achieved by utilizing Electro-magnetic solver suitable for planer structure. The fabricated balun IC in 180-nm CMOS process occupies only 0.03 mm2. The balun IC exhibits an amplitude imbalance of less than 0.9 dB and a phase imbalance of less than 2.5 degrees in a frequency range from 20 GHz to 66 GHz.