Summary
International Technical Conference on Circuits/Systems, Computers and Communications
2008
Session Number:P2
Session:
Number:P2-20
Dual Band CMOS Quadrature VCO using Reconfigurable LC Tank and Coupled Transistors
Min-Woo Seo, Cheol-Hoe Kim, Hyung-Joun Yoo,
pp.-
Publication Date:2008/7/7
Online ISSN:2188-5079
Summary:
In this paper, a dual band quadrature VCO in 0.18 μm CMOS process is presented. To accomplish dual band operation, reconfigurable LC tank is adopted. Series coupling transistors are attached to generate quadrature phase signal with low power consumption and low phase noise. To improve phase noise performance, current sources are eliminated and a filter inductor at the common source node is added. The measured phase noises of low frequency mode and high frequency mode are -101.81 dBc/Hz and -100.59 dBc/Hz at 10 kHz offset frequency; and -123.83 dBc/Hz and -115.06 dBc/Hz at 1 MHz offset frequency and figure of merit (FoM) at 1 MHz offset frequency of -181.8 dB and -180.5 dB with 4 mA current consumption with a 1.7 V supply.