Electrical computers and digital processing systems: support – Computer power control – Power conservation
Reexamination Certificate
2005-04-19
2005-04-19
Browne, Lynne H. (Department: 2116)
Electrical computers and digital processing systems: support
Computer power control
Power conservation
C713S300000, C713S310000, C713S340000, C307S109000, C307S110000, C307S140000, C235S380000, C235S492000, C235S493000
Reexamination Certificate
active
06883103
ABSTRACT:
A data carrier that communicates confidential data is configured to mask process-dependent power consumption by using power stored in an internal capacitor. The capacitor is initially charged to the voltage of an external power source, and then decoupled from the external power source. The capacitor provides power to an internal processor, and consequently discharges gradually. At the end of a given time interval, the capacitor is discharged to a fixed voltage, then charged to the supply voltage. In this manner the power consumed by charging of the capacitor is decoupled from the power consumed by the processor. If the capacitor drops below a threshold voltage before processing is completed, the processor is halted. To optimize the available processing time, the time interval before discharging the capacitor to the fixed voltage is dynamically adjusted to reduce the time that the processor is halted.
REFERENCES:
patent: 3790890 (1974-02-01), Doittau et al.
patent: 3846699 (1974-11-01), Martyashin et al.
patent: 4097727 (1978-06-01), Ulch
patent: 4780813 (1988-10-01), Gerety et al.
patent: 5241160 (1993-08-01), Bashan et al.
patent: 5449894 (1995-09-01), Bruhnke et al.
patent: 5729053 (1998-03-01), Orthmann
patent: 5754462 (1998-05-01), Little
patent: 5852290 (1998-12-01), Chaney
patent: 5959471 (1999-09-01), Weinfurtner
patent: 5998978 (1999-12-01), Connell et al.
patent: 6098890 (2000-08-01), Kreft et al.
patent: 6419159 (2002-07-01), Odinak
patent: 6507130 (2003-01-01), Thuringer et al.
patent: 6507913 (2003-01-01), Shamir
patent: 6772946 (2004-08-01), Ruat et al.
patent: WO 9708929 (1997-03-01), None
patent: 0026868 (2000-05-01), None
Feuser Markus
Thueringer Peter
Ully Klaus
Browne Lynne H.
Koninklijke Philips Electronics , N.V.
Patel Nitin C.
Simons Kevin
LandOfFree
Data carrier for the adaptation of a consumption time... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Data carrier for the adaptation of a consumption time..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data carrier for the adaptation of a consumption time... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3401751