Chen C.-NKuo T.-YHUEI WANG2021-09-022021-09-022020https://www.scopus.com/inward/record.uri?eid=2-s2.0-85096547542&doi=10.1109%2fRFIT49453.2020.9226248&partnerID=40&md5=1a2fedd1a3ef484774958e3911affe23https://scholars.lib.ntu.edu.tw/handle/123456789/580870A 20-43 GHz downconverter with wide IF BW, low noise, and Gbps-data links with good SNR is introduced for the superheterodyne Rx of 5G backhauls. The single-balanced (SB-) downconverter adopts passive cold-bias mixing stage and differential common-source (CS-) FETs g{\mathrm{m}} stage to achieve wide RF/IF BW, high isolations, and low noise figure (NF) with low LO drive. Continuous wave (CW) tests show RF BW of 20-43 GHz and IF BW of 0.1-6 GHz with flat conversion gain (CG), and 6.2-9.7 dB single-sideband (SSB) NF. The GHz-BW QAM carrier down-conversion tests present 8-15 Gbps data rate with 64/256 QAM in 5G K/Ka-band of 24/28/39 GHz. The wideband downconverter with Gbps data-link capability can be utilized for high-speed backhauls communication in full 5G K/Ka-bands. ? 2020 IEEE.5G mobile communication systems; Digital storage; Gallium arsenide; III-V semiconductors; Noise figure; Radio waves; Signal to noise ratio; Continuous waves; Conversion gain; Down conversion; Down converters; High isolation; Low noise figure; Single balanced; Single side bands; Quadrature amplitude modulation[SDGs]SDG7conference paper10.1109/RFIT49453.2020.92262482-s2.0-85096547542