System and method for current sensing
US6559684B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 2002 |
| Grant date | May 6, 2003 |
| Priority date | — |
| Expiry date | May 8, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/158
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A system and method for current sensing which is substantially consistent over device, temperature, and process variations is provided. A current sensing system includes a first switch coupled to one or more variable resistive elements. The resistive elements being configured to scale down the voltage across the first switch which is provided to an input of an amplifier. The amplifier is coupled to the resistive elements and the second switch and is configured to sense the voltage across the first switch, and force the voltage across the second switch to be equal to the first switch scaled down voltage. Thus, a current of known proportion can be provided at the output of the amplifier. A driver and timing circuit may be provided to prevent the amplifier from providing an excessive slewing of current during the off period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.