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An image-rejection down-converter for low-IF receivers

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4 Author(s)
Sher Jiun Fang ; Dept. of Electr. Eng., Univ. of Washington, Seattle, WA ; Bellaouar, A. ; See Taur Lee ; Allstot, D.J.

Implemented in 4.1 mm2 in 130-nm CMOS, a dual-conversion image-rejection down-converter applied to the wireless code-division multiple-access (WCDMA) standard draws 13 mA from a single 1.8-V power supply. Using an IF of 2.5 MHz, the WCDMA image-rejection band is widened from 0.58-4.42 MHz to 0.48-5.2 MHz-a bandwidth ratio of 10.8-to accommodate process, voltage, and temperature variations in high-volume production. Ten samples are measured and fully characterized: average image-rejection ratio (IRR) is 46.6 dBc, gain is 12 dB, and noise figure is 10.8 dB. Typical IRR is 44.8, 46.5, and 47.5 dBc at -20degC, 25degC, and 80degC, respectively

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:53 ,  Issue: 2 )

Date of Publication:

Feb. 2005

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