A 6–11GHz multi-phase VCO design with active inductors

A multiphase VCO using differential active inductors is designed and fabricated in an IBM 0.13 um CMOS process. Using active inductors, the core VCO occupies 0.3times0.4 mm , and the central frequency can vary from 6 GHz to 11 GHz, exhibiting a 58% tunable frequency ranges. Exploiting current reuse, the phase noise is measured to be less than -95 dBc/Hz at 1 MHz offset with the measured power consumption ranging from 12 to 31 mW in 6-11 GHz. A signal coupling technique with phase shifting is employed to generate eight phase signals. The achieved phase errors of this design are smaller than 3deg. In addition, bias compensation is shown to reduce the frequency variation under 10% while the temperature varies from -55degC to 125degC.

[1]  Mohammed Ismail,et al.  A 10-GHz CMOS quadrature LC-VCO for multirate optical applications , 2003 .

[2]  D. Kasperkovitz,et al.  A 9.8-11.5 GHz quadrature ring oscillator for optical receivers , 2001, Proceedings of the IEEE 2001 Custom Integrated Circuits Conference (Cat. No.01CH37169).

[3]  Ramesh Harjani,et al.  Design of low-phase-noise CMOS ring oscillators , 2002 .

[4]  A low-phase-noise wide-band CMOS quadrature VCO for multi-standard RF front-ends , 2005, 2005 IEEE Radio Frequency integrated Circuits (RFIC) Symposium - Digest of Papers.

[5]  Byung-Hun Min,et al.  5-GHz CMOS LC VCOs with wide tuning ranges , 2005 .

[6]  Liang-Hung Lu,et al.  A Wide Tuning-Range CMOS VCO With a Differential Tunable Active Inductor , 2006, IEEE Transactions on Microwave Theory and Techniques.

[7]  P. Sen,et al.  Reconfigurable RFICs in Si-based technologies for a compact intelligent RF front-end , 2005, IEEE Transactions on Microwave Theory and Techniques.

[8]  Chun-Huat Heng,et al.  A 1.8-GHz CMOS fractional-N frequency synthesizer with randomized multiphase VCO , 2003 .

[9]  Shen-Iuan Liu,et al.  A 2.4GHz CMOS Quadrature VCO for 2.4GHz WLAN/Bluetooth Applications , 2005, 2005 IEEE Asian Solid-State Circuits Conference.