Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Reexamination Certificate
2004-04-28
2008-07-01
Ejaz, Naheed (Department: 2611)
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
C332S127000
Reexamination Certificate
active
07394885
ABSTRACT:
A spread-spectrum clock signal generator includes a circuit loop receiving a reference signal at a reference frequency and adapted to generate an output signal at an output frequency dependent on and locked to the reference frequency, and a modulator circuit generating a modulation signal at a modulation frequency; the modulation signal is injected into the circuit loop to induce a modulation of the frequency of the output signal with respect to the frequency dependent on the reference frequency. The circuit loop is a frequency-locked loop and has a bandwidth sufficiently higher than the modulation frequency, so that the output frequency tracks the modulation signal. Frequency-offset correction circuit is further provided, for evaluating a frequency offset between an average frequency of the output signal and the frequency dependent on the reference frequency, and for generating a frequency-offset correction signal which is injected into the circuit loop for correcting the evaluated frequency offset.
REFERENCES:
patent: 5631920 (1997-05-01), Hardin
patent: 5909144 (1999-06-01), Puckette et al.
patent: 5943382 (1999-08-01), Li et al.
patent: 6046646 (2000-04-01), Lo et al.
patent: 6141163 (2000-10-01), Nakamura et al.
patent: 6294936 (2001-09-01), Clementi
patent: 7298808 (2007-11-01), Rey
patent: 2004/0056724 (2004-03-01), Arp
Michel J- Y et al. “A frequency modulated PLL for EMI reduction in embedded application”, ASIC/SOC Conference, 1999, Proceedings. Twelfth Annual IEEE International Washington, DC, USA Sep. 15-18, 1999, Piscataway, NJ, USA, IEEE, US Sep. 15, 1999, pp.362-365.
European Search Report for EP 03 42 5257 dated Oct. 8, 2003.
Ballerini Massimo
Gardellini Daniele
Giunco Fabio
Accent S.R.L.
Ejaz Naheed
Fan Chieh M.
Graybeal Jackson Haley LLP
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