High capacity current mirror circuit
US4843304A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 19, 1987 |
| Grant date | Jun 27, 1989 |
| Priority date | — |
| Expiry date | May 19, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/347
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A high capacity current mirror circuit comprises an operational amplifier electrically connected with its input, on the one side, to both a reference current source and a power supply pole through a first resistor, and on the other side, to said power supply pole through a second, feedback resistor, said amplifier being connected with its output to the base of a transistor, thereby supplying a current which is a mirror image of the reference current. According to the invention, that transistor is of the npn type, and in one embodiment, the transistor is connected in a Darlington configuration at the output of the operational amplifier which is of the transconductance type.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.