Oscillators – Automatic frequency stabilization using a phase or frequency... – Tuning compensation
Reexamination Certificate
2006-09-26
2006-09-26
Chang, Joseph (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Tuning compensation
C331S023000
Reexamination Certificate
active
07113047
ABSTRACT:
To present a clock generator capable of spreading the spectrum of oscillation frequency by simple control in a small additional circuit, and its control method. A phase locked loop circuit is provided from a frequency phase comparator11, an output clock signal PO is outputted from a voltage control oscillator (VCO)14by way of a charge pump circuit (CP)12and a loop filter (LF)13, and is returned to the frequency phase comparator11by way of a frequency divider (DIV)15. Detecting the phase difference of reference clock signal R and divided clock signal D, and locking the oscillation frequency of the output clock signal PO to specified frequency, a modulation signal M is outputted from a modulation pulse generator1regardless of phase locked control of phase locked loop circuit, and is superposed on phase comparison signal P, and thereby the oscillation frequency of output clock signal PO is modulated. An output clock signal PO having a predetermined spectrum spread characteristic can be obtained.
REFERENCES:
patent: 4639682 (1987-01-01), Takeuchi
patent: 5598130 (1997-01-01), Mesuda et al.
patent: 5705955 (1998-01-01), Freeburg et al.
patent: 6650193 (2003-11-01), Endo et al.
patent: 2001-007700 (2001-01-01), None
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