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http://dx.doi.org/10.5515/KJKIEES.2008.19.12.1350

An MMIC Doubly Balanced Resistive Mixer with a Compact IF Balun  

Jeong, Jin-Cheol (Global Area Wireless Technology Research Department, ETRI)
Yom, In-Bok (Global Area Wireless Technology Research Department, ETRI)
Yeom, Kyung-Whan (Department of Radio Science and Engineering, Chungnam Natinal University)
Publication Information
Abstract
This paper presents a wideband doubly balanced resistive mixer fabricated using $0.5{\mu}m$ GaAs p-HEMT process. Three baluns are employed in the mixer. LO and RF baluns operating over an 8 to 20 GHz range were implemented with Marchand baluns. In order to reduce chip size, the Marchand baluns were realized by the meandering multicoupled line and inductor lines were inserted to compensate for the meandering effect. IF balun was implemented through a DC-coupled differential amplifier. The size of IF balun is $0.3{\times}0.5\;mm^2$ and the measured amplitude and phase unbalances were less than 1 dB and $5^{\circ}$, respectively from DC to 7 GHz. The mixer is $1.7{\times}1.8\;mm^2$ in size, has a conversion loss of 5 to 11 dB, and an output third order intercept(OIP3) of +10 to +15 dBm at 16 dBm LO power for the operating bandwidth.
Keywords
Resistive Mixer; Doubly Balanced Mixer(DBM); GaAs Monolithic Microwave Integrated Circuit (MMIC); Marchand Balun;
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