Proportional regulation for optimized current sensor performance
US7868643B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 2008 |
| Grant date | Jan 11, 2011 |
| Priority date | — |
| Expiry date | May 26, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/0027
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An integrated circuit device comprises a first transistor having a gate coupled to an output of a first operational amplifier, a second transistor having a threshold voltage proportional to a threshold voltage of the first transistor, the second transistor having a gate coupled to an inverting input of a second operational amplifier, an output of the second operational amplifier coupled to an inverting input of the first operational amplifier, a first resistor coupled between the second transistor gate and the inverting input of the second operational amplifier, and a second resistor coupled between the output of the second operational amplifier and the inverting input of the second operational amplifier, a ratio of the second resistor to the first resistor selected based upon a ratio of a production distribution of a transistor source voltage offset to a production distribution of a transistor threshold voltage mismatch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.