Low phase-noise oscillator

Details Low phase-noise oscillator Low phase-noise oscillator

2007-12-17

2010-12-07

Chang, Joseph (Department: 2817)

Oscillators

L-c type oscillators

C331S045000, C331S11600M, C331S1170FE, C331S1170FE, C331S17700V

Reexamination Certificate

active

07847650

ABSTRACT:
A tail-tank coupling technique combines two complementary differential LC-VCOs to form a quadrature LC-VCO. The technique reduces phase noise by providing additional energy storage for noise redistribution and by cancelling noise injected by transistors when they operate in the triode region. The resulting noise factor is close to the theoretical minimum 1+γ, similar to a differential LC-VCO driven by an ideal noiseless current source. However, its figure-of-merit is higher, due to the absence of voltage head-room being consumed by a current source. The optimal ratio of tail-tank capacitor to main-tank capacitor for minimizing phase noise is approximately 0.5. The method can be extended to combine any even number of LC tanks resonating at foand 2foto form an integrated oscillator producing quadrature phase at frequency foscand differential output at 2fosc.

REFERENCES:
patent: 6680657 (2004-01-01), Wang et al.
patent: 6850122 (2005-02-01), Ravi et al.
patent: 6911870 (2005-06-01), Gierkink et al.
patent: 7098747 (2006-08-01), Anand
patent: 7511588 (2009-03-01), Gabara
E. Hegazi, J. Rael, and A. Abidi, The Designer's Guide to High-Purity Oscillators. New York: Kluwer, 2005, pp. 50-57.
A. Mirzaei and A. A. Abidi, “Analysis of oscillators locked by large injection signals: generalized . . . ,” in Proc. IEEE Custom Integrated Circuits Conf., Sep. 2006, pp. 737-740.
E. Hegazi, H. Sjöland, and A. A. Abidi, “A filtering technique to lower LC oscillation phase noise,” IEEE J. Solid-State Circuits, vol. 36, pp. 1921-1930, Dec. 2001.
A. A. Abidi, “High-frequency noise measurements on FET with small dimensions,” IEEE Trans. Electron Devices, vol. 33, pp. 1801-1805, Nov. 1986.
A. Hajimiri and T. H. Lee, “A general theory of phase noise in electrical oscillators,” IEEE J. Solid-State Circuits, vol. 33, pp. 179-194, Feb. 1998.
P. Andreani and A. Fard, “More on the phase noise performance of CMOS differential-pair LC-tank oscillators,” IEEE J. Solid-State Circuits, vol. 41, pp. 2703-2712, Dec. 2006.
R. Bagheri, et. al., “An 800MHz to 5GHz Software-Defined Radio Receiver in 90nm CMOS”, ISSCC 2006 / Session 26, Feb. 8, 2006.
R. Bagheri, et al., “An 800 MHz-6 GHz software-defined wireless receiver in 90-nm CMOS,” IEEE J. Solid-State Circuits, vol. 41, pp. 2860-2876, Dec. 2006.
J. A.Weldon, et al., “A 1.75 GHz highly-integrated narrowband CMOS transmitter with . . . ,” in IEEE Int. Solid-State Circuits Conf. Dig. Tech. Papers, Feb. 2001, pp. 160-161.
P. Andreani and X. Wang, “On the phase-noise and phase-error performances of multiphase LC CMOS VCOs,” IEEE J. Solid-State Circuits, vol. 39, pp. 1883-1893, Nov. 2004.
M. Tiebout, “Low-power low-phase-noise differentially tuned quadrature VCO design in standard CMOS,” IEEE J. Solid-State Circuits, vol. 36, pp. 1018-1024, Jul. 2001.
T. P. Liu, “A 6.5 GHz monolithic CMOS voltage-controlled oscillator,” in IEEE Int. Solid-State Circuits Conf. Dig. Tech. Papers, Feb. 1999, pp. 404-405.
J. E. Rogers and J. R. Long, “A 10-Gb/s CDR/DEMUX with LC delay line VCO in 0.18- m CMOS,” in IEEE Int. Solid-State Circuits Conf. Dig. Tech. Papers,Feb. 2002, pp. 254-255.
J. Lee and B. Razavi, “A 40-Gb/s clock and data recovery circuit in 0.18- m CMOS technology,” IEEE J. Solid-State Circuits, vol. 38, pp. 2181-2190, Dec. 2003.
S. L. J. Gierkink, et al., “A low-phase-noise 5-GHz CMOS quadrature VCO using superharmonic coupling,” IEEE J. Solid-State Circuits, vol. 38, pp. 1148-1154, Jul. 2003.
A. Ravi, et al., “An optimally transformer coupled, 5 GHz quadrature VCO in a 0.18- m digital CMOS process,” in Dig. IEEE Symp. VLSI Circuits, Jun. 2003, pp. 141-144.
C. Yao and A. Willson, “A phase-noise reduction technique for quadrature LC-VCO . . . ,” in IEEE Int. Solid-State Circuits Conf. Dig. Tech. Papers, Feb. 2006, pp. 196-197.

Affiliated with

Also associated with

Rating

Low phase-noise oscillator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low phase-noise oscillator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low phase-noise oscillator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4204959