A Direct Conversion Receiver for W-CDMA Reducing Current Consumption to 31 mA

Hiroshi YOSHIDA
Takehiko TOYODA
Makoto ARAI
Ryuichi FUJIMOTO
Toshiya MITOMO
Masato ISHII
Rui ITO
Tadashi ARAI
Tetsuro ITAKURA
Hiroshi TSURUMI

Publication
IEICE TRANSACTIONS on Electronics   Vol.E88-C    No.6    pp.1271-1274
Publication Date: 2005/06/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.6.1271
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Analog Circuit and Device Technologies)
Category: RF
Keyword: 
direct conversion,  power consumption,  W-CDMA,  

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Summary: 
A direct conversion receiver for W-CDMA, which consumes extremely low power, is presented. The receiver consists of a low-noise amplifier (LNA) IC, a receiver IC and other passive components such as an RF-SAW (Surface Acoustic Wave) filter. The receiver IC includes a quadrature demodulator (QDEM) with a local oscillator (LO) divider, low-pass filters (LPFs) for channel selection, variable gain amplifiers (VGAs) with dynamic range of 80 dB, and a fractional-N synthesizer. The power consumption for the entire receiver chain was only 30.8 mA at supply voltage of 2.7 V.