Title :
Wide tuning range inversion-mode gated varactor and its application on a 2-GHz VCO
Author :
Wong, W. ; Hui, F. ; Zhiheng Chen ; Keqiang Shen ; Lau, J.
Author_Institution :
Dept. of Electron. & Electr. Eng., Hong Kong Univ. of Sci. & Technol., Kowloon, Hong Kong
Abstract :
This paper presents a novel inversion-mode three-terminal varactor with a capacitance ranging from 0.7 pF to 2.3 pF, achieving a /spl plusmn/53% variation in the capacitance. The new device is implemented in a 0.35-/spl mu/m standard CMOS process. The measured quality factor is 22 at 2 GHz. A 2-GHz VCO is designed with this new varactor and is able to achieve a tuning range of 320 MHz with a maximum tuning gain of 220 MHz/V.
Keywords :
CMOS analogue integrated circuits; Q-factor; UHF integrated circuits; UHF oscillators; circuit tuning; varactors; voltage-controlled oscillators; 0.35 micron; 0.7 to 2.3 pF; 2 GHz; CMOS process; VCO; capacitance; inversion-mode three-terminal gated varactor; quality factor; tuning range; CMOS process; CMOS technology; Capacitance; Circuit optimization; Q factor; Ring oscillators; Tuning; Varactors; Voltage; Voltage-controlled oscillators;
Conference_Titel :
VLSI Circuits, 1999. Digest of Technical Papers. 1999 Symposium on
Conference_Location :
Kyoto, Japan
Print_ISBN :
4-930813-95-6
DOI :
10.1109/VLSIC.1999.797233
