A 5.9 GHz Low Power and Wide Tuning Range CMOS Current-controlled Ring Oscillator

Prapto Nugroho (Kyushu University)
Ramesh K. Pokharel
Haruichi Kanaya (Kyushu University)
Keiji Yoshida (Kyushu University)

International Journal of Electrical and Computer Engineering
Vol 2, No 3: June 2012

Designing low power, low noise, wide tuning range and small size circuit in one single chip is very challenging. This paper describe a low power, wide tuning range three-stage current-controlled ring oscillator (CCO) designed on 0.18um CMOS technology. The CCO circuit has tuning range from 251 MHz to 5.5 GHz or 183% wide. It consumes only 144 uA to 9.76mA by using 1.8V power supply. Phase noise is -104 dBc /Hz at 5.5 GHz and 4 Mhz offset frequency.  Calculated FoM is -154.4 dBc /Hz which is the best among published counterpart papers. The size of the core oscillator circuits without bonding pads is only 0.0003 mm2.DOI:http://dx.doi.org/10.11591/ijece.v2i3.229