Feedback-based linearization of voltage controlled oscillator

Details Feedback-based linearization of voltage controlled oscillator Feedback-based linearization of voltage controlled oscillator

2009-09-10

2011-11-01

Johnson, Ryan (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S00100A, C327S156000, C327S176000

Reexamination Certificate

active

08049568

ABSTRACT:
Embodiments of the present invention enable a feedback-based VCO linearization technique. Embodiments include a frequency locked loop formed by feeding back a VCO's output into the VCO's input in negative phase by means of a frequency-to-voltage (F/V) converter. Embodiments enable constant VCO gain over a wide input tuning range and across PVT variations. Further, embodiments can be nested within a PLL, for example, with negligible area and power consumption overhead.

REFERENCES:
patent: 6262609 (2001-07-01), Hafez et al.
patent: 6614313 (2003-09-01), Crofts et al.
Zhao, et al., “A 0.18um RF CMOS Ultra Wide Band Transmitter Front End RFIC”, Radio Frequency Integrated Circuits (RFIC) Symposium, 2006 IEEE, Jun. 11-13, 2006, 4 pp.—509.
Abidi, “Linearization of Voltage-Controlled Oscillators Using Switched-Capacitor Feedback”, Solid-State Circuits, IEEE Journal of, vol. 22 , Issue: 3, 1987, pp. 494-496.
Vlswanatha et al., “Switched-Capacitor Frequency Control Loop”, Solid-State Circuits, IEEE Journal of, vol. 17, Issue: 4, 1982 , pp. 775-778.

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