A 0.18-µm 10-GHz CMOS ring oscillator for optical transceivers. - Hai Qi Liu; Wang Ling Goh; Liter Siek (ISCAS (2), 2005)

1.8-V 10-GHZ ring VCO design using 0.18-μm CMOS technology. - Hai Qi Liu; Wang Ling Goh; Liter Siek (SoCC, 2005)

A Low-Noise Multi-GHz CMOS Multiloop Ring Oscillator With Coarse and Fine Frequency Tuning. - Hai Qi Liu; Wang Ling Goh; Liter Siek; Wei Meng Lim; Yue Ping Zhang (IEEE Trans. Very Large Scale Integr. Syst., 2009)