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High‐gain reconfigurable LNA using optimized Q ‐factor inductor and switched capacitor
Author(s) -
Chang HoJun,
Park KunMan,
Ham JungHyun,
Yun TaeYeoul
Publication year - 2011
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.25945
Subject(s) - inductor , q factor , noise figure , switched capacitor , capacitor , cmos , electrical engineering , electronic engineering , microwave , high gain antenna , engineering , computer science , telecommunications , resonator , amplifier , voltage
This letter presents a band‐selectable LNA with high gain and low noise in 0.25‐μm RF CMOS technology.The proposed reconfigurable LNA uses two techniques: optimized spiral inductors and a switched capacitor technique. The gain and noise figure of the LNA are improved by using Q‐factor optimized inductors, which are designed with an octagonal shape having a peak Q‐factor at desired frequency bands. The high Q‐factor of the switched capacitor in parallel configuration at the load also increases the gain of the band‐selectable LNA. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1069–1074, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25945