Using a low frequency timer to restore timing to a high frequency timer
First Claim
1. A method for use in reestablishing a timing signal in a high frequency timing circuit after the high frequency timing circuit has lost power, the method comprising:
- (a) measuring the timing of a low frequency timing circuit against the timing of the high frequency timing circuit before the high frequency timing circuit has lost power,(b) using the low frequency timing circuit to measure time after the high frequency timing circuit has lost power, and(c) based on a time measurement obtained from the low frequency timing circuit, re-establishing the timing signal at an appropriate time after the high frequency timing circuit has regained power, wherein the re-establishing the timing signal includes;
first using the low frequency timing circuit to reapply power to a high frequency oscillator that drives the high frequency timing circuit, and thenusing the low frequency timing circuit and a signal from the high frequency oscillator to generate a synchronization pulse that aligns the high frequency timing circuit.
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Accused Products
Abstract
A low frequency timing circuit is used to reestablish a timing signal in a high-frequency timing circuit after the high frequency timing circuit has lost and regained power. The timing of the low frequency circuit is measured against the timing of the high frequency circuit before the high frequency circuit has lost power. The low frequency circuit then is used to measure time after the high frequency circuit has lost power. Once the high frequency circuit has regained power, its timing signal is reestablished at an appropriate time based on a time measurement obtained from the low frequency circuit.
29 Citations
18 Claims
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1. A method for use in reestablishing a timing signal in a high frequency timing circuit after the high frequency timing circuit has lost power, the method comprising:
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(a) measuring the timing of a low frequency timing circuit against the timing of the high frequency timing circuit before the high frequency timing circuit has lost power, (b) using the low frequency timing circuit to measure time after the high frequency timing circuit has lost power, and (c) based on a time measurement obtained from the low frequency timing circuit, re-establishing the timing signal at an appropriate time after the high frequency timing circuit has regained power, wherein the re-establishing the timing signal includes; first using the low frequency timing circuit to reapply power to a high frequency oscillator that drives the high frequency timing circuit, and then using the low frequency timing circuit and a signal from the high frequency oscillator to generate a synchronization pulse that aligns the high frequency timing circuit. - View Dependent Claims (2, 3, 4)
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5. An electronic device comprising:
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(a) a high frequency timing circuit configured to produce a timing signal, (b) power-down circuitry configured to remove power temporarily from the high frequency timing circuit, (c) a low frequency timing circuit configured to measure time after the high frequency timing circuit has lost power, (d) calibration circuitry configured to measure the timing of the low frequency timing circuit against the timing signal before the high frequency timing circuit has lost power, and (e) control circuitry configured to receive a time measurement from the low frequency timing circuit and reestablish the timing signal at an appropriate time after the high frequency timing circuit has regained power;
wherein the control circuitry is configured to;first using the low frequency timing circuit to reapply power to a high frequency oscillator that drives the high frequency timing circuit, and then using the low frequency timing circuit and a signal from the high frequency oscillator to generate a synchronization pulse that aligns the high frequency timing circuit. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A method for use by a mobile station to synchronize a high frequency timing circuit to a frame pulse used for synchronizing the mobile station with a base station in a wireless network, the method comprising:
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calibrating a timing of a low frequency timing circuit against a timing of the high frequency timing circuit; entering the high frequency timing circuit into a sleep mode; waking up the high frequency timing circuit from the sleep mode by applying power to a high frequency oscillator that drives the high frequency timing circuit, in response to a wake up signal generated by the low frequency timing circuit; and synchronizing the high frequency timing circuit, after the waking up, using the low frequency timing circuit and a signal from the high frequency oscillator to generate a synchronization pulse that aligns the high frequency timing circuit. - View Dependent Claims (12, 13, 14, 15)
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16. A method for use by a mobile station to synchronize a high frequency timing circuit to a frame pulse used for synchronizing the mobile station with a base station in a wireless network, the method comprising:
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calibrating a timing of a low frequency timing circuit against a timing of the high frequency timing circuit; entering the high frequency timing circuit into a sleep mode; waking up the high frequency timing circuit from the sleep mode in response to a wake up signal generated by the low frequency timing circuit; generating a first frame pulse using the high frequency timing circuit after the waking up; and synchronizing the high frequency timing circuit, after the generating, to the frame pulse based on the timing of the low frequency timing circuit. - View Dependent Claims (17, 18)
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Specification