Current difference current source
US4727309A · kind A · utility
62Cited by
3References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1987 |
| Grant date | Feb 23, 1988 |
| Priority date | — |
| Expiry date | Jan 22, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/245
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A current difference current source which provides a stable current as operating conditions change. Two MOS transistors operate as two current sources. A difference current is obtained by subtracting the two transistor currents. The two current sources are configured to vary similarly as conditions change, such that their difference remains constant. In the alternative the difference current is forced to decrease as current increases in the transistors, wherein a reverse compensated current is provided. The difference current is used to drive a current mirror which functions as a compensated current source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.