A 3.16–7 GHz transformer-based dual-band CMOS VCO  

作　　者：李竹 王志功 李智群 李芹 刘法恩 

机构地区：[1]Institute of RF-& OE-ICs,Southeast University [2]Nanjing University of Science and Technology

出　　处：《Journal of Semiconductors》2015年第3期106-113,共8页半导体学报（英文版）

基　　金：Project supported by the National High Technology Research and Development Program of China(No.2011AA10305);the National Natural Science Foundation of China(No.60901012)

摘　　要：A dual-band, wide tuning range voltage-controlled oscillator that uses transformer-based fourth-order（LC） resonator with a compact common-centric layout is presented. Compared with the traditional wide band（VCO）, it can double frequency tuning range without degrading phase noise performance. The relationship between the coupling coefficient of the transformer, selection of frequency bands, and the quality factor at each band is investigated. The transformer used in the resonator is a circular asymmetric concentric topology. Compared with conventional octagon spirals, the proposed circular asymmetric concentric transformer results in a higher qualityfactor, and hence a lower oscillator phase noise. The VCO is designed and fabricated in a 0.18- m CMOS technology and has 75% wide tuning range of 3.16–7.01 GHz. Depending on the oscillation frequency, the VCO current consumption is adjusted from 4.9 to 6.3 m A. The measured phase noises at 1 MHz offset from carrier frequencies of 3.1, 4.5, 5.1, and 6.6 GHz are –122.5, –113.3, –110.1, and –116.8 d Bc/Hz, respectively. The chip area, including the pads, is 1.2×0.62 mm^2 and the supply voltage is 1.8 V.A dual-band, wide tuning range voltage-controlled oscillator that uses transformer-based fourth-order（LC） resonator with a compact common-centric layout is presented. Compared with the traditional wide band（VCO）, it can double frequency tuning range without degrading phase noise performance. The relationship between the coupling coefficient of the transformer, selection of frequency bands, and the quality factor at each band is investigated. The transformer used in the resonator is a circular asymmetric concentric topology. Compared with conventional octagon spirals, the proposed circular asymmetric concentric transformer results in a higher qualityfactor, and hence a lower oscillator phase noise. The VCO is designed and fabricated in a 0.18- m CMOS technology and has 75% wide tuning range of 3.16–7.01 GHz. Depending on the oscillation frequency, the VCO current consumption is adjusted from 4.9 to 6.3 m A. The measured phase noises at 1 MHz offset from carrier frequencies of 3.1, 4.5, 5.1, and 6.6 GHz are –122.5, –113.3, –110.1, and –116.8 d Bc/Hz, respectively. The chip area, including the pads, is 1.2×0.62 mm^2 and the supply voltage is 1.8 V.

关 键 词：CMOS phase noise voltage-controlled oscillator （VCO） WIDEBAND transformer 

分 类 号：TN752[电子电信—电路与系统]