Precision current mirror
US5089769A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1990 |
| Grant date | Feb 18, 1992 |
| Priority date | — |
| Expiry date | Nov 1, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/265
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A current mirror having an input and an output, comprises a diode coupled to the input to which an input current is supplied for providing a bias potential thereacross; an output transistor having an emitter, base and collector, said base and said emitter being coupled respectively across said diode and said collector being coupled to the output, said output transistor being responsive to said diode means for providing an output current the magnitude of which is proportional to said input current; and a compensation circuit coupled to said base of said output transistor and being responsive thereto for producing an output current that is injected at the input of the current mirror for cancelling base current errors caused by the base current of said output transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.