Ring oscillator with ultra-wide frequency tuning range

Details Ring oscillator with ultra-wide frequency tuning range Ring oscillator with ultra-wide frequency tuning range

2007-03-22

2009-08-11

Pascal, Robert (Department: 2817)

Oscillators

Ring oscillators

C331S179000, C331S034000

Reexamination Certificate

active

07573339

ABSTRACT:
Methods and systems for tuning an oscillator are disclosed and may comprise dividing a desired frequency range of a delay-cell based ring oscillator into segments, and tuning the delay-cell based ring oscillator over an ultra-wide frequency range by utilizing these divided segments. The enabled segment may determine the frequency range and the oscillator may be tuned within these segments. The delay may be adjusted utilizing a negative skew technique, and may be controlled by one or more digital codes. The oscillating frequency within each segment may be adjusted utilizing a control voltage or control current. The voltage or current may be buffered and utilized as a common supply of the delay cells.

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Chan-Hong Park and Beomsup Kim,A Low Noise, 900-MHz VCO in 0.6μm CMOS, IEEE Journal of Solid-State Circuits, vol. 34, No. 5, May 1999, pp. 586-591.
Seog-Jun Lee, Beomsup Kim, and Kwyro Lee,A Novel High-Speed Ring Oscillator for Multiphase Clock Generation Using Negative Skewed Delay Scheme, IEE Journal of Solid-State Circuits, vol. 32, No. 2, Feb. 1997, pp. 289-291.

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