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A Novel Hybrid Balun Circuit for 2.4 GHz Low-Power Fully-differential CMOS RF Direct Conversion Receiver  

Chang, Shin-Il (Radio Science and Engineering Dept., Kwangwoon University)
Park, Ju-Bong (PHYCHIPS Inc.)
Shin, Hyun-Chol (Radio Science and Engineering Dept., Kwangwoon University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.45, no.4, 2008 , pp. 86-93 More about this Journal
Abstract
A low-power, low-noise, highly-linear hybrid balun circuit is proposed for 2.4-GHz fully differential CMOS direct conversion receivers. The hybrid balun is composed of a passive transformer and loss-compensating auxiliary amplifiers. Design issues regarding the optimal signal splitting and coupling between the transformer and compensating amplifiers are discussed. Implemented in $0.18{\mu}m$ CMOS process, the 2.4 GHz hybrid balun achieves 2.8 dB higher gain and 1.9 dB lower noise figure than its passive counterpart and +23 dBm of IIP3 only at a current consumption of 0.67 mA from 1.2 V supply. It is also examined that the hybrid balun can remarkably lower the total noise figure of a 2.4 GHz fully differential RF receiver only at a cost of 0.82 mW additional power dissipation.
Keywords
Balun; Receiver; CMOS; RFIC;
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