Low noise voltage-controlled oscillator

Details Low noise voltage-controlled oscillator Low noise voltage-controlled oscillator

2006-03-21

2006-03-21

Mis, David (Department: 2817)

Oscillators

With frequency adjusting means

With voltage sensitive capacitor

C331S057000, C331S1170FE, C331S1170FE, C331S158000

Reexamination Certificate

active

07015768

ABSTRACT:
A low-phase-noise and high-performance voltage-controlled oscillator (VCO) uses a noise-canceling differential varactor topology. An implementation includes circuitry for a fully-differential varactor-inductor oscillator for reduced noise and improved performance. Susceptibility to common-mode noise sources coupled into the varactors is reduced.

REFERENCES:
patent: 6292065 (2001-09-01), Friedman et al.
patent: 6348841 (2002-02-01), See
patent: 6504443 (2003-01-01), Eguizabal
patent: 6566971 (2003-05-01), Gutierrez
patent: 6930562 (2005-08-01), Takinami et al.
Li Lin et al; “A 1.4GHz Differential Low-Noise CMOS Frequency Synthesizer using a Wideband PLL Architecture”; 2000 IEEE International Solid-State Circuits Conference; 3 pages.
Ainspan et al., A Comparison of MOS Varactors in Fully-Integrated CMOS LC VCO's at 5 and 7 GHz, IBM T.J. Watson Research Center.
Levantino et al., “Frequency Dependence on Bias Current in 5-Ghz CMOS VCOs: Impact on Tuning Range and Flicker Noise Upconversion”, IEEE Journal of Solid-State Circuits, vol. 37, No. 8, pp. 1003-1011, Aug. 2002.
Hajimiri et al., “Design Issues in CMOS Differential LC Oscillators”, IEEE Journal of Solid-State Circuits, vol. 34, No. 5, pp. 717-724, May 1999.

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