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A 5.8‐GHz LNA with image rejection and gain control based on 0.18‐μm CMOS
Author(s) -
Kim Jinpil,
Oh YongHun,
Choi JinYoung,
Lee Sanggug
Publication year - 2003
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.11094
Subject(s) - automatic gain control , cascode , noise figure , cmos , low noise amplifier , linearity , electronic engineering , electrical engineering , image response , microwave , power gain , amplifier , high gain antenna , topology (electrical circuits) , engineering , telecommunications , radio frequency , intermediate frequency
This paper presents a low‐noise amplifier (LNA) design which includes image rejection and gain control. The proposed LNA adopts a cascode topology with a notch filter combined with a gain control function. The performance of the proposed LNA is compared with conventional cascode topology and improvements in noise figure and image rejection by 0.3 and 11.5 dB, respectively, are confirmed. The proposed 5.8‐GHz LNA is implemented using 0.18‐μm CMOS technology. Measured high‐gain mode performances show noise figure (NF) = 1.4 dB, gain = 16.5 dB, and input‐P 1dB = −8 dBm; with low‐gain mode, the gain reduces to 5.5 dB while the linearity improves to input‐P 1dB = 10 dBm. The LNA dissipates 4 mA from a 1.8 V supply. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 477–480, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11094