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MIMIC 94 GHz high isolation single balanced cascode mixer  

Lee, Sang-Jin (Millimeter-wave INnovation Technology research center, Dongguk University)
An, Dan (DAPA)
Lee, Mun-Kyo (Millimeter-wave INnovation Technology research center, Dongguk University)
Moon, Sung-Woon (Millimeter-wave INnovation Technology research center, Dongguk University)
Bang, Suk-Ho (Millimeter-wave INnovation Technology research center, Dongguk University)
Baek, Tae-Jong (Millimeter-wave INnovation Technology research center, Dongguk University)
Kwon, Hyuk-Ja (Sam-sung Thales)
Jun, Byoung-Chul (Millimeter-wave INnovation Technology research center, Dongguk University)
Yoon, Jin-Seob (Department of computer aided system, Seoil College)
Rhee, Jin-Koo (Millimeter-wave INnovation Technology research center, Dongguk University)
Publication Information
Abstract
In this paper, the high isolation and wideband 94 GHz MIMIC(Millimeter-wave Monolithic Integrated Circuit) single balanced cascode mixer was designed and fabricated. Also, we designed and fabricated a 3 dB tandem coupler which has a high isolation and wideband characteristic. The single balanced resistive mixer which does not require an external IF balun was designed using the 0.1 ${\mu}m$ InGaAs/InAlAs/GaAs metamorphic HEMT(High Electron Mobility Transistor). The DC characteristics of MHEMT's are 665 mA/mm of drain current density, 691 mS/mm of maximum transconductance. The current gain cut-off frequency($f_T$) is 189 GHz and the maximum oscillation frequency($f_{max}$) is 334 GHz. A 94 GHz single balanced cascode mixer was fabricated using our 0.1 ${\mu}m$ MHEMT MIMIC process. From the measurements, the fabricated couplers showed wideband characteristics. The conversion loss of single balanced cascode mixer was 9.8 dB at an LO power of 10.9 dBm. The LO to RF isolation of single balanced cascode mixer was 29.5 dB at 94 GHz. We obtained in this study a higher LO-RF isolation compared to some other single balanced mixers.
Keywords
single balanced; cascode mixer; MHEMT; Tandem coupler;
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