Modulators – Pulse or interrupted continuous wave modulator – Pulse position – frequency – phase – or spacing modulator
Reexamination Certificate
2006-10-10
2006-10-10
Chang, Joseph (Department: 2817)
Modulators
Pulse or interrupted continuous wave modulator
Pulse position, frequency, phase, or spacing modulator
C341S143000
Reexamination Certificate
active
07119630
ABSTRACT:
A frequency synthesizer is provided having a fractional-N control circuit and method that can selectively apply any fractional ratio to a frequency divider within the feedback loop of a PLL. A special digital delta-sigma modulator can be implemented as the control circuit and can receive any arbitrary numerator and denominator value, or their arithmetic combination, or a positive and negative vector values used by the modulator to achieve an average fractional division. Both the numerator and denominator (or the positive and negative vectors) can be chosen based on any integer value to achieve a more optimal, higher frequency resolution and efficient fractional-N control circuit and methodology thereof.
REFERENCES:
patent: 4965531 (1990-10-01), Riley
patent: 5781044 (1998-07-01), Riley et al.
patent: 6236703 (2001-05-01), Riley
patent: 6456164 (2002-09-01), Fan
patent: 6509800 (2003-01-01), Stockton
patent: 6563390 (2003-05-01), Kizziar
patent: 6707855 (2004-03-01), Patana
patent: 2004/0022340 (2004-02-01), Jaehne et al.
De Muer et al., “A 1.8 GHz CMOS ΔΣ Fractional-N Synthesizer,” EP Solid-State Circuits Conference, 2001, 4 pages.
Ahola et al., “A 2 GHz ΔΣ Fractional-N Frequency Synthesizer in 0.35μm CMOS,” EP Solid-State Circuits Conference, 2000, 4 pages.
Lin et al., “A 900-MHz 2.5-mA CMOS Frequency Synthesizer with an Automatic SC Tuning Loop,” IEEE Journal of Solid-State Circuits, vol. 36, No. 3, Mar. 2001, pp. 424-431.
Schmitt et al., “Designing an EMC-compliant UHF oscillator,” RF Design, Oct. 2000, 8 pages.
Heuberger et al., “Integrated RF transmitter based on SAW Oscillator,” EP Solid-State Circuits Conference, 1997, 4 pages.
Texas Instruments, Technical Brief SWRA029, “Fractional/Integer-N PLL Basics,” Aug. 1999, pp. 1-54.
Chang Joseph
Cypress Semiconductor Corp.
Daffer Kevin L.
Daffer McDaniel LLP
LandOfFree
Frequency synthesizer having a more versatile and efficient... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Frequency synthesizer having a more versatile and efficient..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency synthesizer having a more versatile and efficient... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3629573