Abstract
In this paper, a down-conversion double-balanced micromixer with very good linearity for 5-GHz-band WLAN applications using 0.35-μm 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 (P1dB) greater than 0 dBm, and an input 3rd-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 × 420 μm, excluding the test pads. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 499–502, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20863
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