Current regulator and method
US4808907A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 17, 1988 |
| Grant date | Feb 28, 1989 |
| Priority date | — |
| Expiry date | May 17, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/22
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An integrated circuit for providing a regulated output current comprises an output transistor for producing the output current, a feedback circuit including a current mirror for sensing the magnitude of the output current and providing a feedback current proportional thereto and a driver circuit for comparing the feedback current to an externally generated current and biasing the output transistor accordingly to regulate the magnitude of the output current to a predetermined value. Preferably, the external current is generated through an external resistor coupled to an input of the driver curcuit and the current mirror wherein the magnitude of the external current is directly proportional to a reference voltage provided on chip and applied to an additional input of the driver circuit the latter of which functions as an operational amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.