Current subtraction circuitry
US10797695B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 17, 2018 |
| Grant date | Oct 6, 2020 |
| Priority date | — |
| Expiry date | Apr 17, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/023
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An electronic device may include a sensing circuit and a current subtraction circuit. The sensing circuit may output first and second current signals. The current subtraction circuit may mirror the first and second current signals onto first and second current branches. The second current branch may be split into a first sub-path and a second sub-path. An amplifier may control the amount of current flowing through the second sub-path by forcing the current flowing through the first current branch and the current flowing through the first sub-path to be identical. Configured in this way, the current flowing through the second sub-path will be equal to the difference between the first and second current signals. The current flowing through the second sub-path may be optionally amplified using another current mirror.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.