Low voltage precision current source
US4435678A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1982 |
| Grant date | Mar 6, 1984 |
| Priority date | — |
| Expiry date | Feb 26, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/265
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A circuit for providing a current at an output thereof of a predetermined value which has excellent ripple rejection characteristics whereby the magnitude of the current is maintain substantially constant with variations in the voltage supply applied thereto. The current source includes first and second complementary current mirror circuits interconnected such that the second current mirror sinks the current sourced from the first current mirror. A feedback loop latches the circuit into a stable operation and senses any difference current between the two current mirror circuits caused by perturbations of the supply voltage to produce feedback to maintain the circuit at its quiescent operating point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.