Tzeng, B.B.TzengLien, C.-H.C.-H.LienWang, Y.-C.Y.-C.WangChao, P.-C.P.-C.ChaoChen, C.-H.C.-H.ChenHUEI WANG2020-06-042020-06-042002https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036851268&doi=10.1109%2fTMTT.2002.804506&partnerID=40&md5=339738dcef052d7346ceb8b6f2d89a2cAn InGaP-GaAs heterojunction bipolar transistor (HBT) analog multiplier/mixer monolithic microwave integrated circuit (MMIC) is developed that adopts a Gilbert-cell multiplier with broad-band input-matching networks to widen the bandwidth up to 17 GHz. This MMIC was fabricated using a commercially available 6-in InGaP-GaAs HBT MMIC process. It achieved a measured sensitivity of above 1100 V/W for an analog multiplier and a conversion gain of better than 9 dB for a mixer. It also demonstrated a lower corner frequency and noise than that of an InP HBT analog multiplier. The measured low-frequency noise was 10 nV/sqrt(Hz), which is about half of that of an InP HBT analog multiplier with a similar architecture. The corner frequency of the low-frequency noise was roughly estimated to be 15 kHz. The measured performance of this MMIC chip with gain-bandwidth-product (GBP) of 47 GHz rivals that of the reported GaAs-based analog multipliers and mixers. The high GBP result achieved by this chip is attributed to the HBT device performance and the broad-band input-matching network.Active mixer; Analog multiplier; GaAs monolithic microwave integrated circuit (MMIC); Gilbert celljournal article10.1109/TMTT.2002.8045062-s2.0-0036851268