Title :
A transformer-based low phase noise and widely tuned CMOS quadrature VCO
Author :
Lee, Young Jae ; Yu, Hyun Kyu
Author_Institution :
RF-Analog SoC Design Team, Electron. & Telecommun. Res. Inst., Daejeon
Abstract :
A VCO at 10GHz using the transformer-based LC tank in 0.18mum CMOS technology is designed. The LC tank is realized employing the drain-gate transformer feedback configuration. To apply to the pmos and nmos feedback path, two 2-port transformers are used. The 2-port transformer has symmetric structure and can be connected to enhance the quality factor of LC resonator. The simulated phase noise is -115dBc/Hz at the offset of 1MHz. The tuning range of 2.1GHz is achieved with the control voltage from 0V to 1.8V
Keywords :
CMOS integrated circuits; MMIC oscillators; Q-factor; circuit feedback; phase noise; transformers; two-port networks; voltage-controlled oscillators; 0 to 1.8 V; 0.18 micron; 10 GHz; 2.1 GHz; CMOS quadrature VCO; CMOS technology; LC resonator; drain-gate transformer feedback configuration; nmos feedback path; pmos feedback path; quality factor; transformer-based LC tank; transformer-based low phase noise; two-port transformers; 1f noise; CMOS technology; Feedback; Inductors; Phase noise; Q factor; Radio frequency; Stacking; Transformer cores; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on
Conference_Location :
Island of Kos
Print_ISBN :
0-7803-9389-9
DOI :
10.1109/ISCAS.2006.1693509
