A 2.4, 5.2, and 5.7 GHz CMFB Gilbert downconverter with low‐voltage cascode current mirror input stage

Abstract

AbstractA triple‐band (2.4, 5.2, and 5.7 GHz) CMFB downconversion micromixer with a low‐voltage cascode current mirror RF input stage has been demonstrated by the 0.18‐μm CMOS technology in this letter. Micromixer has a single‐ended RF input stage, the CMFB topology is adopted to improve the conversion gain, and a differential‐to‐single output buffer is used to convert the differential output of the mixer into a single‐ended output. The fully integrated downconversion micromixer has the conversion gain of 12 dB, LO‐to‐IF isolation of 43 dB, LO‐to‐RF isolation of 48 dB, and RF‐to‐IF isolation of 18 dB at 2.4 GHz. The mixer has the conversion gain of 7.5 dB, LO‐to‐IF isolation of 54 dB, LO‐to‐RF isolation of 49.5 dB, and RF‐to‐IF isolation of 25 dB at 5.7 GHz. The total quiescent current consumption of the circuit is 7.6 mA. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48:2345–2349, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21950