System and method for self calibrating voltage-controlled...

Details System and method for self calibrating voltage-controlled... System and method for self calibrating voltage-controlled...

2006-10-26

2009-06-16

Pascal, Robert (Department: 2817)

Oscillators

With frequency calibration or testing

C331S016000, C331S011000, C331S179000, C327S157000

Reexamination Certificate

active

07548124

ABSTRACT:
A system and a method for self calibrating a voltage-controlled oscillator (VCO). In the system, a mode controller generates a control signal for each of an automatic band selection mode, an automatic gain tuning mode, and a phase-locking mode, from a frequency comparison result between a reference clock signal and a divided clock signal which is generated by dividing a frequency of an oscillation signal, and thereby controls the VCO, so that the VCO may generate the oscillation signal which is automatically phase-locked in a target frequency with an optimal state.

REFERENCES:
patent: 6552618 (2003-04-01), Nelson et al.
patent: 6683502 (2004-01-01), Groen et al.
patent: 7230505 (2007-06-01), Rachedine et al.
patent: 2002/0070761 (2002-06-01), Abbiate et al.
patent: WO 2004/004126 (2004-01-01), None
Wilson et al., “A CMOS Self-Calibrating Frequency Synthesizer”, Oct. 2000, IEEE Journal of Solid-State Circuits, vol. 35, No. 10, pp. 1437-1444.

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