Title :
A low-phase-noise K-band CMOS VCO
Author :
Hsieh-Hung Hsieh ; Liang-Hung Lu
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei
Abstract :
A novel circuit topology for low-phase-noise voltage controlled oscillators (VCOs) is presented in this letter. By employing a PMOS cross-coupled pair with a capacitive feedback, superior circuit performance can be achieved especially at higher frequencies. Based on the proposed architecture, a prototype VCO implemented in a 0.18-mum CMOS process is demonstrated for K-band applications. From the measurement results, the VCO exhibits a 510-MHz frequency tuning range at 20GHz. The output power and the phase noise at 1-MHz offset are -3dBm and -111dBc/Hz, respectively. The fabricated circuit consumes a dc power of 32mW from a 1.8-V supply voltage
Keywords :
CMOS analogue integrated circuits; MMIC oscillators; voltage-controlled oscillators; 0.18 micron; 1.8 V; 20 GHz; 32 mW; CMOS radio frequency; K-band CMOS VCO; LC-tank circuit; PMOS cross-coupled pair; capacitive feedback; circuit topology; differential Colpitts oscillators; voltage controlled oscillators; CMOS process; Circuit optimization; Circuit topology; Frequency measurement; K-band; Phase noise; Power generation; Prototypes; Tuning; Voltage-controlled oscillators; CMOS radio frequency (RF); Capacitive feedback; K-band; LC-tank; differential colpitts oscillators; low phase noise; voltage-controlled oscillators (VCOs);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2006.882386
