Phase-locked loop frequency synthesizer of fractional...

Details Phase-locked loop frequency synthesizer of fractional... Phase-locked loop frequency synthesizer of fractional...

2011-08-23

2011-08-23

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S147000, C327S163000, C331S00100A, C331S018000, C375S376000

Reexamination Certificate

active

08004324

ABSTRACT:
Provided is a phase-locked loop frequency synthesizer, including: a reference oscillator; a voltage controlled oscillator; a variable frequency divider that divides the high frequency signal in frequency to output a feedback signal; a phase comparator that compares the reference signal and the feedback signal with each other to output a phase comparison signal; a loop filter that outputs a control signal of the voltage controlled oscillator based on the phase comparison signal; and a frequency/phase control circuit that generates frequency division number control data in synchronism with any one of the feedback signal and the reference signal based on setting data which is input from an external to give an output frequency and setting data which is input from the external to give a phase to the reference signal, to thereby output the frequency division number control data to the variable frequency divider.

REFERENCES:
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Riley, Tom A. D. et al., “Delta-Sigma Modulation in Fractional-NFrequency Synthesis”, IEEE Journal of Solid State Circuits, vol. 28, No. 5, pp. 553-559, (1993).
Office Action issued Jan. 25, 2011 in Japanese Patent Application No. 2007-557827.

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