Kuo, C.-L.C.-L.KuoKuo, C.-C.C.-C.KuoLien, C.-H.C.-H.LienTsai, J.-H.J.-H.TsaiHUEI WANG2020-06-042020-06-042008https://www.scopus.com/inward/record.uri?eid=2-s2.0-40549088612&doi=10.1109%2fLMWC.2008.916806&partnerID=40&md5=b49315b7d856f13501cc656299e05dc7A broadband distributed sub-harmonic resistive field effect transistor mixer with a novel modified rat-race broadside coupler using a 0.13-μm CMOS foundry process is presented in this letter. Using the broadside coupler, a reduced-size rat-race is fabricated with a compact size of 110 × 80 μm2, From the measurement results, the mixer achieved a conversion loss of 12 dB from 32 to 70 GHz of RF frequency. The passive sub-harmonic mixer has zero power consumption. With the modified rat-race broadside coupler, the mixer achieves a good LO-IF isolation of better than 30 dB and a compact core chip size of 0.55 × 0.4 mm2. © 2008 IEEE.CMOS; Distributed circuit; Monolithic microwave integrated circuit (MMIC); Sub-harmonic mixer[SDGs]SDG7CMOS integrated circuits; Electric power utilization; Electric variables measurement; Field effect transistors; Monolithic microwave integrated circuits; Conversion losses; Distributed circuits; Sub-harmonic mixers; Mixer circuitsjournal article10.1109/LMWC.2008.9168062-s2.0-40549088612