Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Reexamination Certificate
2006-04-18
2008-12-02
Lau, Tung S (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Electrical signal parameter measurement system
Reexamination Certificate
active
07460966
ABSTRACT:
An analog circuit of a microcontroller includes a switch that is coupled in series with a capacitor of the analog circuit. During nominal power mode operation, an operational voltage is present on the capacitor. The switch is conductive so that the capacitor is switched into the analog circuit and so that the capacitor operates as part of the analog circuit. At the beginning of sleep mode operation, the switch is made nonconductive thereby effectively switching the capacitor out of the analog circuit and storing the operational voltage on the capacitor. When the analog circuit is powered up again after sleep mode operation, the switch is made conductive to switch the capacitor back into the analog circuit. Because the capacitor still holds a substantial voltage, analog circuit wake up time is reduced because the time required to charge the capacitor up to its operational voltage is reduced.
REFERENCES:
patent: 5939998 (1999-08-01), Caporuscio et al.
patent: 7080270 (2006-07-01), Yokozeki et al.
patent: 2004/0263237 (2004-12-01), Kim et al.
patent: 2005/0207195 (2005-09-01), Olsson et al.
patent: 2006/0176040 (2006-08-01), Kernahan et al.
Imperium Patent Works
Lau Tung S
Sun Xiuquin
Wallace Darien K.
ZiLOG, Inc.
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