Pulse or digital communications – Spread spectrum
Reexamination Certificate
2006-05-23
2006-05-23
Patel, Jay K. (Department: 2637)
Pulse or digital communications
Spread spectrum
C327S101000, C327S143000
Reexamination Certificate
active
07050478
ABSTRACT:
A spread spectrum clock system (11) modulates the supply voltage for a circuit (10) in concert with the circuit clock frequency (C). The system increases the supply voltage for the circuit (10) in phase with increases in the circuit clock frequency (C). However, in the portion of the clock frequency modulation period in which the clock frequency (C) is decreasing, the system (11) also decreases the supply voltage for the circuit (10). This relationship between the circuit supply voltage and circuit clock frequency (C) may be accomplished by modulating the output (18) of a power supply (15) for the circuit (10) and applying that modulated supply voltage signal through a signal translator (30) to control modulation of a clock source (14).
REFERENCES:
patent: 5307003 (1994-04-01), Fairbanks et al.
patent: 5627412 (1997-05-01), Beard
patent: 5630110 (1997-05-01), Mote, Jr.
patent: 5684392 (1997-11-01), Chang et al.
patent: 5736893 (1998-04-01), Puckette et al.
patent: 5760636 (1998-06-01), Noble et al.
patent: 5778237 (1998-07-01), Yamamoto et al.
patent: 5787294 (1998-07-01), Evoy
patent: 5812860 (1998-09-01), Horden et al.
patent: 5872807 (1999-02-01), Booth et al.
patent: 5943382 (1999-08-01), Li et al.
patent: 6141762 (2000-10-01), Nicol et al.
patent: 6366157 (2002-04-01), Abdesselem et al.
patent: 6377646 (2002-04-01), Sha
patent: 6424184 (2002-07-01), Yamamoto et al.
patent: 6425086 (2002-07-01), Clark et al.
Spread spectrum clock generation for the reduction of radiated emissions Hardin, K.B.; Fessler, J.T.; Bush, D.R.; Electromagnetic Compatibility, 1994. Symposium Record. Compatibility in the Loop. IEEE International Symposium on , 22-26.
A frequency modulated PLL for EMI reduction in embedded application Michel, J.-Y.; Neron, C.; ASIC/SOC Conference, 1999. Proceedings. Twelfth Annual IEEE International , 15-18 Sep. 1999.
English language translation of abstract of Japanese Patent No. JP5073166A2, Published Mar. 26, 1993.
Culbertson Russell D.
International Business Machines - Corporation
McBurney Mark E.
Meek Jacob
Patel Jay K.
LandOfFree
Apparatus and method for synchronizing clock modulation with... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for synchronizing clock modulation with..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for synchronizing clock modulation with... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3645873