A Reconfigurable Dual-Band Bidirectional Image Rejection Mixer for 5G FR2 Applications
Zhenyu Han, Kaixue Ma, Xu Wang · 2025
This paper presents a compact, reconfigurable dual-band bidirectional image rejection mixer for 5G FR2 applications. This mixer uses a current-flipping bidirectional mixer to achieve bidirectional signal transmission and up/down conversion. A reconfigurable and tunable poly-phase filter (PPF) is used for sideband selection and calibration. It uses a miniaturized passive LO quadrature generation network (QGN) for high-precision quadrature signals. Simulated in 40-nm CMOS, the mixer operates from 24-29.5 and 37-43.5 GHz with an LO frequency of 30-37 GHz, making the upper and lower sidebands mirror images of each other. The IF range is 2.5-6.5 GHz. Post-simulation results show that in both RX and TX modes, the peak conversion gain (CG) is -6.6 dB and -6.2 dB, respectively, with image rejection ratio greater than 39 dB. The simulated LO-to-RF and LO-to-IF isolation is better than 57 and 69 dBc. The chip core area is only 0.63 × 0.83 mm2.