A 0.18 $\mu$ m CMOS Quadrature VCO Using the Quadruple Push-Push Technique

This letter presents a new quadrature voltage-controlled oscillator (QVCO), which consists of two complementary cross-coupled voltage-controlled oscillators (VCOs) with two tail inductors. The two differential VCOs are coupled via two tail inductors to form a quadrature VCO. The proposed CMOS QVCO has been implemented with the TSMC 0.18 μm CMOS technology and the die area is 0.83 × 0.96 mm2. At the supply voltage of 1.45 V, the free-running frequency of the QVCO is tunable from 4.94 to 5.22 GHz as the tuning voltage is varied from 0.0 to 1.0 V. The total power consumption is 8.7 mW and the measured phase noise at 1 MHz frequency offset is -124.58 dBc/Hz at the oscillation frequency of 5.15 GHz and the figure of merit (FOM) of the proposed QVCO is -189.42 dBc/Hz.

[1]  A. Gutierrez-Aitken,et al.  A 108-GHz InP-HBT monolithic push-push VCO with low phase noise and wide tuning bandwidth , 1999, IEEE J. Solid State Circuits.

[2]  Eleonora Franchi,et al.  Quadrature VCO based on direct second harmonic locking , 2004, 2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512).

[3]  Yi-Jan Emery Chen,et al.  A low-voltage low-phase-noise bottom-series LC QVCO using capacitor tapping technique , 2008, 2008 IEEE MTT-S International Microwave Symposium Digest.

[4]  S.-L. Jang,et al.  CMOS Colpitts Quadrature VCO Using the Body Injection-Locked Coupling Technique , 2009, IEEE Microwave and Wireless Components Letters.

[5]  Sheng-Lyang Jang,et al.  CMOS Quadrature VCO Implemented With Two First-Harmonic Injection-Locked Oscillators , 2008, IEEE Microwave and Wireless Components Letters.

[6]  Jae-Hong Chang,et al.  A symmetrical 6-GHz fully integrated cascode coupling CMOS LC quadrature VCO , 2005 .

[7]  Sang-Gug Lee,et al.  Source-injection parallel coupled LC-QVCO , 2003 .

[8]  Changsik Yoo,et al.  5-GHz Low-Phase Noise CMOS Quadrature VCO , 2006, IEEE Microwave and Wireless Components Letters.

[9]  P. Andreani,et al.  On the phase-noise and phase-error performances of multiphase LC CMOS VCOs , 2004, IEEE Journal of Solid-State Circuits.

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

[11]  A. Rofougaran,et al.  A 900 MHz CMOS LC-oscillator with quadrature outputs , 1996, 1996 IEEE International Solid-State Circuits Conference. Digest of TEchnical Papers, ISSCC.

[12]  M. S. Lu,et al.  A 5.8-GHz VCO with CMOS-compatible MEMS inductors , 2007 .

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