Wakeup time system using drift estimation
US9766682B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 26, 2015 |
| Grant date | Sep 19, 2017 |
| Priority date | — |
| Expiry date | May 6, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D10/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus includes a sleep clock circuit that generates a sleep clock signal and an accurate clock circuit that, when on, generates an accurate clock signal. The apparatus is configured to enter a sleep mode, generate sleep clock measurements by measuring the sleep clock signal using the accurate clock signal during an initial sleep interval, estimate a cumulative error using the sleep clock measurements, and determine a final sleep interval using the cumulative error. A method includes determining a duration of an initial sleep interval and generating measurements of a sleep clock signal using an accurate clock signal. The measurements of the sleep clock signal correspond to sampling intervals within the initial sleep interval. A cumulative error value is generated according to the measurements, and a duration of a final sleep interval is determined according to the cumulative error value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.