Low Phase Noise Self-Switched Biasing CMOS LC Quadrature VCO

A self-switched biasing quadrature voltage-controlled oscillator (VCO) is presented. It is implemented by directly injecting the oscillation signal of one VCO core into the other VCO core through the divided tail current sources without additional active devices for coupling. The proposed coupling structure automatically switches the NMOS field-effect transistors used in VCO cores and current sources from strong inversion to accumulation. Since the deep switching of MOSFETs was reported to physically reduce flicker noise, the proposed quadrature VCO (QVCO) is expected to improve the phase noise performance, which is confirmed experimentally. The designed QVCO using 0.18- mum CMOS technology operates from 1.86 to 2.2 GHz with a 17% frequency tuning range. The measured phase noise is from - 129.1 to - 134.5 dBc/Hz at a 1-MHz offset, which is really close to ideal simulation results with the NMOS model disabling the flicker noise components. The average measured phase noise is 7.2 dB below the simulated one with a flicker noise model, which verifies the physical reduction of flicker noise by deep switching of the MOSFET. The phase noise figure-of-merit ranges from 179 to 185 over the entire tuning range. The QVCO dissipates 20 mA from a 1.8-V supply.

[1]  Y. Nemirovsky,et al.  1/ f noise reduction of metal‐oxide‐semiconductor transistors by cycling from inversion to accumulation , 1991 .

[2]  Michiel Steyaert,et al.  A single-chip 900 MHz CMOS receiver front-end with a high performance low-IF topology , 1995, IEEE J. Solid State Circuits.

[3]  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.

[4]  Jacques C. Rudell,et al.  A 1.9-GHz wide-band IF double conversion CMOS receiver for cordless telephone applications , 1997, IEEE J. Solid State Circuits.

[5]  Peter R. Kinget,et al.  Integrated GHz Voltage Controlled Oscillators , 1999 .

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

[7]  A. Hajimiri,et al.  Design issues in CMOS differential LC oscillators , 1999, IEEE J. Solid State Circuits.

[8]  E. Klumperink,et al.  Intrinsic 1/f device noise reduction and its effect on phase noise in CMOS ring oscillators , 1999, IEEE J. Solid State Circuits.

[9]  E. Klumperink,et al.  Reducing MOSFET 1/f noise and power consumption by switched biasing , 1999, IEEE Journal of Solid-State Circuits.

[10]  J.R. Long,et al.  A low-voltage 5.1-5.8-GHz image-reject receiver with wide dynamic range , 2000, IEEE Journal of Solid-State Circuits.

[11]  A. Abidi,et al.  Physical processes of phase noise in differential LC oscillators , 2000, Proceedings of the IEEE 2000 Custom Integrated Circuits Conference (Cat. No.00CH37044).

[12]  Ali Hajimiri,et al.  Concepts and methods in optimization of integrated LC VCOs , 2001, IEEE J. Solid State Circuits.

[13]  M. Steyaert,et al.  A 1.57 GHz fully integrated very low phase noise quadrature VCO , 2001, 2001 Symposium on VLSI Circuits. Digest of Technical Papers (IEEE Cat. No.01CH37185).

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

[15]  William Liu,et al.  MOSFET Models for SPICE Simulation: Including BSIM3v3 and BSIM4 , 2001 .

[16]  A. Bonfanti,et al.  Analysis and design of a 1.8-GHz CMOS LC quadrature VCO , 2002, IEEE J. Solid State Circuits.

[17]  B. Nauta,et al.  Measurement of MOSFET LF Noise Under Large Signal RF Excitation , 2002, 32nd European Solid-State Device Research Conference.

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

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

[20]  Choong-Ki Kim,et al.  A symmetrical 6-GHz fully integrated cascode coupling CMOS LC quadrature VCO , 2005, IEEE Microwave and Wireless Components Letters.

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

[22]  A.A. Abidi,et al.  The Quadrature LC Oscillator: A Complete Portrait Based on Injection Locking , 2007, IEEE Journal of Solid-State Circuits.