Fractional-N frequency synthesizer and method thereof

Details Fractional-N frequency synthesizer and method thereof Fractional-N frequency synthesizer and method thereof

2011-07-05

2011-07-05

Mis, David (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

C331S00100A, C331S016000, C331S017000, C331S025000

Reexamination Certificate

active

07973606

ABSTRACT:
The present relates to a fractional-N frequency synthesizer improving noise characteristics and a method thereof. The fractional-N frequency synthesizer includes a reference oscillator that generates a reference frequency signal; a sigma-delta modulator that generates a desired decimal value based on the reference frequency signal; a divider that divides a voltage controlled oscillation frequency signal; first to M phase/frequency detectors that detect a difference in phase and frequency between the reference frequency signal and the divided voltage controlled oscillation frequency signal; first to M charge pumps that are connected to each of the phase/frequency detectors in series and charges or pumps charge amount according to output signals from each of the phase/frequency detectors; a loop filter that controls the amount of supplied current based on output signals from the charge pumps to filter low-pass frequency components; and a voltage controlled oscillator that is oscillated in response to the output signal from the loop filter and generates voltage controlled oscillation frequency signals.

REFERENCES:
patent: 7636018 (2009-12-01), Chang et al.
patent: 2008/0224789 (2008-09-01), Chang et al.
patent: 2010/0225361 (2010-09-01), Rhee et al.
patent: 2010/0329388 (2010-12-01), Ko
patent: 10-2006-0091145 (2006-08-01), None

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