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J. Electromagn. Eng. Sci > Volume 8(3); 2008 > Article
Journal of the Korean Institute of Electromagnetic and Science 2008;8(3):91-95.
DOI: https://doi.org/10.5515/JKIEES.2008.8.3.091   
A 3~5 GHz UWB Up-Mixer Block Using 0.18-μm CMOS Technology
Chang-Wan Kim
Dept. of Electronics Engineering, Dong-A University
This paper presents a direct-conversion I/Q up-mixer block, which supports $3{sim}5$ GHz ultra-wideband(UWB) applications. It consists of a VI converter, a double-balanced mixer, a RF amplifier, and a differential-to-single signal converter. To achieve wideband characteristics over $3{sim}5$ GHz frequency range, the double-balanced mixer adopts a shunt-peaking load. The proposed RF amplifier can suppress unwanted common-mode input signals with high linearity. The proposed direct-conversion I/Q up-mixer block is implemented using $0.18-{mu}m$ CMOS technology. The measured results for three channels show a power gain of $-2{sim}-9$ dB with a gain flatness of 1dB, a maximum output power level of $-7{sim}-14.5$ dBm, and a output return loss of more than - 8.8 dB. The current consumption of the fabricated chip is 25.2 mA from a 1.8 V power supply.학원 환경응용과학과 대기오염연구실 및 환경연구센터;
Key words: CMOS, Driver Amplifier, Direct-Conversion, Mixer, Wideband, Ultra-Wideband, UWB


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