US 2008/0082279 A1Published application

Real-time clock calibration method and system

AssigneeAnalog Devices, Inc.

InventorsMichael A. Ashburn, Stephen W. Harston

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Abstract

Real-time clock calibration is accomplished by generating a fast clock signal and a slow clock signal from an uncompensated clock signal; selectively, momentarily, replacing the uncompensated clock signal with the fast and slow clock signal to generate a compensated clock signal; generating from the compensated clock signal a calibration strobe and window trigger; responding to the window trigger to detect any uncompensated clock signal frequency error and responding to the calibration strobe to selectively, momentarily, replace the uncompensated clock signal with the fast or slow clock signal to reduce the clock signal frequency error.

Claims33

Dependent claims

A calibrated real-time clock system comprising:

a first clock responsive to an uncompensated clock signal for generating a fast clock signal at higher frequency than said uncompensated clock signal;
a second clock responsive to said uncompensated clock signal for generating a slow clock signal at lower frequency than said uncompensated clock signal;
a switching circuit for selectively, momentarily, replacing said uncompensated clock signal with said fast or slow clock signal to generate a compensated clock signal;
a calibration timing circuit for generating a calibration strobe and a window trigger from said compensated clock signal;
and
a logic circuit responsive to said window trigger for detecting any uncompensated clock frequency error and responsive to said calibration strobe for driving said switching circuit to selectively, momentarily, replace said uncompensated clock signal with said fast or slow clock signal to reduce the uncompensated clock frequency error.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/901,825Filed 19 Sep 2007
Priority: 3 Oct 2006
Published: 3 Apr 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G06F 1/14
Generating or distributing clock signals or signals derived directly therefrom: time supervision arrangements, e.g. real time clock
G06F 11/1604
Error detection or correction of the data by redundancy in hardware: where the fault affects the clock signals of a processing unit and the…
G06F
Computing and data processing

Family

Application60/848,917Us provisional application · filed 3 Oct 2006
US 7,797,118 B2Related patent
US 2008/0082279 A1This patent

From the US filing history. Foreign family members aren’t listed.

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