An Ultra-wideband and Low Phase Noise LC-VCO Using NMOS Varactor with MOM Digital Capacitor Switching Arrays

This paper presents a novel low-phase-noise and ultra-bandwidth LC-tank voltage- controlled oscillator (VCO). The work fully-integrated 5.8GHz VCO designed and simulated using 130-nm CMOS technology. Instead of using the conventional varactor in the tank de- sign, a novel metal-oxidemetal (MOM) digital capacitor switching array (MOMDCSA) has been implemented with nMOS varactor is employed as an efiective varactor bank. The proposed VCO- measured results at the centre frequency demonstrate a phase noise of i129:7dBc/Hz and FOM of i198:38dBc/Hz at 1MHz frequency ofiset. The VCO shows approximately 33% tuning range under a power consumption of 2.8mW.

[1]  Mohammed Ismail,et al.  CMOS PLLs and VCOs for 4G Wireless , 2004 .

[2]  Jing Jin,et al.  A Wideband Voltage-Controlled Oscillator With Gain Linearized Varactor Bank , 2014, IEEE Transactions on Components, Packaging and Manufacturing Technology.

[3]  Jun Hu,et al.  A 5-GHz low-phase-noise CMOS LC-VCO for China ETC applications , 2011, 2011 IEEE International Conference on Microwave Technology & Computational Electromagnetics.

[4]  A. Hajimiri,et al.  The Design of Low Noise Oscillators , 1999 .

[5]  Ko-Chi Kuo,et al.  A low phase noise VCO for 5-GHz WiMAX/WLAN frequency synthesizer , 2013, 2013 IEEE International Conference of Electron Devices and Solid-state Circuits.

[6]  Marc Tiebout,et al.  Low power VCO design in CMOS , 2005 .

[7]  Ye Tian-chun,et al.  A low-phase-noise LC-VCO with an enhanced-Q varactor for use in a high-sensitivity GNSS receiver , 2012 .

[8]  D. Leeson.  A simple model of feedback oscillator noise spectrum , 1966 .