Wide range high accuracy current sensing
US10488876B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2018 |
| Grant date | Nov 26, 2019 |
| Priority date | — |
| Expiry date | Dec 20, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/562
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A circuit and a method using a pass device that is coupled between a supply voltage level and a load-connectable node of the circuit for providing a load current. A sense device forms a current mirror with the pass device. The sense device has transistor devices that can be switched to an active state, to adjust a mirror ratio of the current mirror. A first feedback loop regulates a voltage drop across the pass device to a predetermined value. A second feedback loop regulates a voltage drop across the sense device to the voltage drop across the pass device. Measurement circuitry sets a mirror ratio of the current mirror based on an indication of a current flowing through the sense device and generates an indication of current flowing through the pass device based on the set mirror ratio and the indication of the current flowing through the sense device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.