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Design of CMOS LC VCO with Fast AFC Technique for IEEE 802.11a/b/g Wireless LANs  

Ahn Tae-Won (School of Electrical Engineering, Dongyang Technical College)
Yoon Chan-Geun (School of Electrical Engineering, Dongyang Technical College)
Moon Yong (School of Electronic Engineering, Soongsil University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.43, no.9, 2006 , pp. 17-22 More about this Journal
Abstract
CMOS LC VCO with fast response adaptive frequency calibration (AFC) technique for IEEE 802.11a/b/g WLANs is designed in 1.8V $0.18{\mu}m$ CMOS process. The possible operation is verified for 5.8GHz band, 5.2GHz band, and 2.4GHz band using the switchable L-C resonators. To linearize its frequency-voltage gain (Kvco), optimized multiple MOS varactor biasing tecknique is used. In order to operate in each band frequency range with reduced VCO gain, 4-bit digitally controlled switched- capacitor bank is used and a wide-range digital logic quadricorrelator (WDLQ) is implemented for fast frequency detector.
Keywords
CMOS; VCO; AFC; WLAN; WDLQ;
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