1.9 GHz Si Direct Conversion Receiver IC for QPSK Modulation Systems

Chikau TAKAHASHI  Ryuichi FUJIMOTO  Satoshi ARAI  Tetsuro ITAKURA  Takashi UENO  Hiroshi TSURUMI  Hiroshi TANIMOTO  Shuji WATANABE  Kenji HIRAKAWA  

IEICE TRANSACTIONS on Electronics   Vol.E79-C   No.5   pp.644-649
Publication Date: 1996/05/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microwave Devices for Mobile Communications)
Category: Active Devices
direct conversion receiver,  2nd-order distortion,  QPSK,  

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A 1.9GHz direct conversion receiver(DCR) chip which integrates an LNA, I/Q mixers(MIX), active lowpass filters(LDF) and variable gain amplifiers(VGA) was fabricated. Because the DCR for QPSK modulation systems is sensitive to the 2nd-order nonlinearity, linearization techniques are adopted in MIX and LPF. The DCR chip was fabricated using a BiCMOS process, and the die size is 5.1 mm by 5.1mm. The chip can operate from 2.7 V supply voltage and consumes 165mW when all the functions are activated. Suppression of local signal radiation and the 2nd-order distortion indicate the feasibility of Si-based DCR for QPSK modulation systems such as PHS.