Title :
A Fundamental 90-GHz CMOS VCO Using New Ring-Coupled Quad
Author :
Tsai, Zuo-Min ; Lin, Chin-Shen ; Huang, C.F. ; Chern, John G J ; Wang, Huei
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei
fDate :
3/1/2007 12:00:00 AM
Abstract :
A new circuit topology, named ring-coupled quad for millimeter-wave voltage controlled oscillator (VCO) design, is proposed. The proposed circuit topology provides higher open loop voltage gain than conventional cross-coupled pair. The layout of the proposed ring-coupled quad is fully symmetric without additional interconnection lines. A 90-GHz VCO using 90-nm CMOS process is implemented with this ring-coupled quad. This 90-GHz oscillator demonstrates a 2.5-GHz tuning range and higher than -20dBm output power. The proposed ring-coupled quad is suitable for the realization of high frequency VCOs
Keywords :
CMOS integrated circuits; MIMIC; millimetre wave oscillators; voltage-controlled oscillators; 2.5 GHz; 90 GHz; 90 nm; CMOS VCO; CMOS process; circuit topology; high frequency VCO; millimeter-wave voltage controlled oscillator; open loop voltage gain; ring-coupled quad; CMOS process; Circuit optimization; Circuit topology; Frequency; Integrated circuit interconnections; Millimeter wave circuits; Power generation; Tuning; Voltage; Voltage-controlled oscillators; Cross-coupled; millimeter-wave; voltage controlled oscillator (VCO);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2006.890499
