A 4.8GHz Low-Phase Noise Quadrature Colpitts VCO

A 4.8GHz low-noise quadrature Colpitts VCO is presented. Use of the current switching differential Colpitts configuration together with super harmonic coupling scheme for quadrature signal generation ensures low phase noise operation. The advantage of proposed differential VCO is analyzed in terms of power consumption, phase noise, and figure of merit. The QVCO has been fabricated with the 0.18-m TSMC CMOS technology for 4.8GHz band operation and the obtained phase noise is -120 dBc/Hz at 1MHz offset frequency while 7mA current consumption and 12.6mW power consumption from 1.8V power supply

[1]  Qiuting Huang.  Phase noise to carrier ratio in LC oscillators , 2000 .

[2]  M. Tiebout,et al.  Low-power low-phase-noise differentially tuned quadrature VCO design in standard CMOS , 2001, IEEE J. Solid State Circuits.

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

[4]  Sang-Gug Lee,et al.  A very low-power quadrature VCO with back-gate coupling , 2004, IEEE J. Solid State Circuits.

[5]  Behzad Razavi,et al.  A low-power 2.4-GHz transmitter/receiver CMOS IC , 2003, IEEE J. Solid State Circuits.

[6]  S. Simon Wong,et al.  Analysis and optimization of accumulation-mode varactor for RF ICs , 1998, 1998 Symposium on VLSI Circuits. Digest of Technical Papers (Cat. No.98CH36215).

[7]  Thomas H. Lee,et al.  The Design of CMOS Radio-Frequency Integrated Circuits: RF CIRCUITS THROUGH THE AGES , 2003 .

[8]  M. Thompson,et al.  A 0.18 /spl mu/m CMOS 2.45 GHz, low-power quadrature VCO with 15% tuning range , 2002, 2002 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium. Digest of Papers (Cat. No.02CH37280).

[9]  Salvatore Levantino,et al.  A low-phase-noise 5-GHz CMOS quadrature VCO using superharmonic coupling , 2003, IEEE J. Solid State Circuits.

[10]  Moon-Su Yang,et al.  A very low-power quadrature VCO with back-gate coupling , 2004, IEEE Journal of Solid-State Circuits.

[11]  Hyunchol Shin,et al.  A 1.8-V 6/9-GHz switchable dual-band quadrature LC VCO in SiGe BiCMOS technology , 2002, 2002 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium. Digest of Papers (Cat. No.02CH37280).

[12]  Robert G. Meyer,et al.  Start-up and frequency stability in high-frequency oscillators , 1992 .

[13]  K. Soumyanath,et al.  An optimally transformer coupled, 5 GHz quadrature VCO in a 0.18 /spl mu/m digital CMOS process , 2003, 2003 Symposium on VLSI Circuits. Digest of Technical Papers (IEEE Cat. No.03CH37408).

[14]  Gabriel M. Rebeiz,et al.  A low-noise transformer-based 1.7 GHz CMOS VCO , 2002, 2002 IEEE International Solid-State Circuits Conference. Digest of Technical Papers (Cat. No.02CH37315).

[15]  Ali Hajimiri,et al.  A noise-shifting differential Colpitts VCO , 2002, IEEE J. Solid State Circuits.

[16]  Moon-Que Lee,et al.  Design of quadrature CMOS VCO using source degeneration resistor , 2005, 2005 IEEE Radio Frequency integrated Circuits (RFIC) Symposium - Digest of Papers.