A 1-V 2.4-GHz Downconverter for FSK Wireless Applications with a Complex BPF and a Frequency Doubler in CMOS/SOI

Mamoru UGAJIN  Junichi KODATE  Tsuneo TSUKAHARA  

IEICE TRANSACTIONS on Electronics   Vol.E87-C    No.6    pp.888-894
Publication Date: 2004/06/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit and Device Technologies)
RF,  FSK downconverter,  CMOS,  SOI,  complex BPF,  frequency doubler,  

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This paper describes a 2.4-GHz downconverter that runs on a 1-V supply. The downconverter integrates an LNA, a quadrature mixer, a complex channel-select band-pass filter (BPF), a limiting amplifier, and a frequency doubler using 0.2-µm CMOS/SOI technology. The frequency doubler doubles the frequency deviation of FM signals as well as the frequency itself, which in turn doubles the modulation index. This improves the sensitivity of FM demodulation. The power consumption of the downconverter is 23 mW with a 1-V power supply. A bit-error-rate (BER) measurement using the downconverter and a demodulation IC shows -76.5-dBm sensitivity at a 0.1% BER.