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Oscillator using calibration means (SE)

An oscillator, a technology for controlling oscillators, applied in power oscillators, instruments, electronic timers, etc., can solve problems such as low LPO accuracy

Inactive Publication Date: 2005-02-23
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, small T wake will result in low LPO accuracy

Method used

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  • Oscillator using calibration means (SE)
  • Oscillator using calibration means (SE)
  • Oscillator using calibration means (SE)

Examples

Experimental program
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Embodiment Construction

[0024] Figure 1 shows the basic operation of a periodically calibrated LPO. A conventional LPO 110 such as a relaxation oscillator is controlled by a calibration circuit 120 . Calibration unit according to LPO output and reference signal X OSC A correction signal E is periodically determined. The correction signal E expressed by the binary word is stored in the register 140, and when output, it is converted into an analog signal in the D / A converter 130, and the LPO 110 is controlled to output an operating frequency F LPO . The D / A converter is here explicitly shown, but it could also be part of the LPO oscillator tank. That is, the oscillation tank of the relaxation oscillation type LPO is implemented with a capacitor bank, and each capacitor can be directly connected or switched out by a binary word to control the frequency of the LPO.

[0025] During sleep, X OSC and calibration unit 120 is powered off. The LPO applies the control signals stored in the register 140 an...

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PUM

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Abstract

A method for calibrating a frequency device by monitoring its output cycles over a first plurality of monitoring windows is disclosed. An accumulation of these monitored cycles is used to determine a correction for the device over a second plurality of monitoring windows. A method for obtaining fractional correction values to be applied for controlling the frequency device is also disclosed.

Description

technical field [0001] This invention relates to battery powered units and more particularly to a method of maintaining clock accuracy in such units while minimizing power consumption. Background technique [0002] A real-time clock is included in many devices, from watches used to display the time of day to more complex smart devices whose actions are progressed based on the time of day. In most installations, clock inaccuracies are treated as a minor inconvenience, resolved by adjusting the clock as needed to accommodate clock drift and aging. However, for some systems that rely on time progress tables, the time accuracy requirements are very strict. This is especially true in systems consisting of several units, each with its own clock, because the units cooperate to schedule their collective actions according to their clocks. Mutual drift in the clocks will make movements uncoordinated and prevent coordination. For example, in U.S. Patent Applica...

Claims

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Application Information

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IPC IPC(8): G04G3/00H03J7/06H03L7/02H03L7/14H03L7/181
CPCH03J7/06H03L7/146H03L7/02H03B1/00
Inventor J·哈尔特森B·马霍莱夫
Owner TELEFON AB LM ERICSSON (PUBL)