Wide operating-frequency range voltage controlled oscillators

Details Wide operating-frequency range voltage controlled oscillators Wide operating-frequency range voltage controlled oscillators

2006-08-31

2008-09-30

Chang, Joseph (Department: 2817)

Oscillators

Ring oscillators

C331S185000, C331S173000

Reexamination Certificate

active

07429897

ABSTRACT:
Voltage controlled oscillator (VCO) circuitry with low phase noise and a wide range of operating frequencies is presented. The VCO circuitry includes circuitry with two or more VCO sub-circuits, each sub-circuit being optimized to produce output clock signals with low phase noise and with frequencies in a different range. Sub-circuits with gear inputs may be operative to produce output clock signals in a lower range of frequencies, while sub-circuits optimized for high speed operation may be used to produce output signals in a higher range of frequencies. A control circuit may be used to produce a control signal coupled to all sub-circuits. The control signal may set the operating frequency of the sub-circuits.

REFERENCES:
patent: 6809605 (2004-10-01), Ogawa et al.
patent: 6825732 (2004-11-01), Motoyama
patent: 7205854 (2007-04-01), Liu
patent: 2004/0263200 (2004-12-01), Persun et al.
patent: 2005/0046497 (2005-03-01), Nakanishi
patent: 2006/0103478 (2006-05-01), Brown et al.
U.S. Appl. No. 11/437,558.

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