Communication device with a self-calibration sleep timer

Details Communication device with a self-calibration sleep timer Communication device with a self-calibration sleep timer

2007-05-14

2009-06-23

Nguyen, Lee (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

With particular receiver circuit

C455S255000, C455S574000

Reexamination Certificate

active

07551911

ABSTRACT:
Provided is a system for operating a communication device (20) for reception of scheduled intermittent information messages (22) with a dual mode timer (70) that extends battery life. A controller (50) schedules the timer (70) to power down all idle components of the device (20) between message receptions in a power saving sleep mode to conserve battery power. During active mode when the device is fully active in reception of messages, the timer (70) uses a reference oscillator (90) with a relatively high frequency to support digital processing by the receiver (26). During sleep mode when only the timer is powered on, a much lower frequency sleep oscillator (96) is used to maintain the lowest possible level of power consumption within the timer itself. The timer (70) has provision for automatic temperature calibration to compensate for timing inaccuracies inherent to the low-power low-frequency crystal oscillator (96) used for the sleep mode. The resultant improvement in timer accuracy during sleep mode eliminates the need for an initial reacquisition period following wake up in active mode, thereby reducing battery drain in active mode as well.

REFERENCES:
patent: 5995820 (1999-11-01), Young et al.
patent: 6804503 (2004-10-01), Shohara et al.
patent: 7218911 (2007-05-01), Shohara et al.
patent: 0726508 (1996-08-01), None

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