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http://dx.doi.org/10.5916/jkosme.2013.37.1.99

A fully integrated downconverter MMIC for millimeter wave applications  

Jeon, Jang-Hyeon (한국해양대학교 전파공학과)
Yun, Young (한국해양대학교 전파공학과)
Abstract
In this paper, we developed a fully integrated downconverter MMIC (monolithic microwave integrated circuit) including Lange coupler and output active balun for millimeter wave applications. Concretely, ${\lambda}$/4 transmission line was added to Lange coupler for size reduction of RF/LO input, and mixed RF/LO signals were applied to gate of the FET of mixer. Active balun was used at output port for a coupling of out-of-phase IF output signals. According to measured results, the proposed downconverter MMIC showed good RF performances. For example, the downconverter MMIC showed an LO leakage power of -25 dBc at IF output port, and a RF-LO isolation of 18 dB. Therefore, off-chip components such as LO rejection filters were not required for a normal operation of the proposed downconverter MMIC. The proposed downconverter MMIC showed a conversion gain of 10.3 dB at RF frequency of 63 GHz. The size of the downconverter MMIC including all active and passive components was $2.2{\times}1.4mm^2$.
Keywords
Downconverter; MMIC(monolithic microwave integrated circuit); Millimeter wave; Lange coupler; Active balun;
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