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A high-linearity micromixer for 5-GHz-band WLAN applications using 0.35-μm SiGe BiCMOS technology

✍ Scribed by Yo-Sheng Lin; Chi-Chen Chen

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
164 KB
Volume
45
Category
Article
ISSN
0895-2477

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✦ Synopsis

In this paper, a down-conversion double-balanced micromixer with very good linearity for 5-GHz-band WLAN applications using 0.35-m SiGe BiCMOS technology is presented. Good conversion gain of 7.3 dB, LO-RF isolation of 50 dB, LO-IF isolation of 45 dB, and RF-IF isolation of 28.5 dB are achieved at measurement condition of RF frequency of 5.2 GHz, LO frequency of 4.9 GHz, IF frequency of 0.3 GHz, and supply voltage of 3 V. In addition, very good linearity performances, that is, an input 1-dB compression point (P 1dB ) greater than 0 dBm, and an input 3 rd -order intercept point (IIP3) of 0.5 dBm were also achieved. The single-to-differential input stages in the RF and LO ports eliminate the need for common-mode rejection. The micromixer consumes 15.6-mW power and occupies an area of only 660 ϫ 420 m, excluding the test pads.

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