Patent · US Expired

Method and apparatus for using a low clock frequency to maintain a time reference governed by a high clock frequency

US6728234B1 · kind B1 · utility

13Cited by

4References

14Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Ludwig Hofmann · Pfaffenhofen an der Ilm, DE
Frank Lillie · Hersbruck, DE
Jan Meyer · Weilheim, DE

Key dates

Filing date	Feb 8, 2000
Grant date	Apr 27, 2004
Priority date	—
Expiry date	Feb 8, 2020

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02D30/70
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

The present invention relates to a method for maintaining a time reference which is governed by a high clock frequency produced by a first clock frequency generator, in which a changeover is essentially made, for a changeover time period, to a low clock frequency produced by a second clock frequency generator. The apparatus of the invention maintains the time reference governed by the high clock frequency, wherein a changeover is made to the low clock frequency for a specific changeover time period. The invention is advantageously used to save power in electronic apparatus such as in mobile stations of mobile radio systems.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.