Current mirror with low headroom and linear response
US7907012B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 21, 2008 |
| Grant date | Mar 15, 2011 |
| Priority date | — |
| Expiry date | Oct 28, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/343
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A current mirror circuit provided in an emitter follower configuration achieves linear output currents over a range of input currents by operating in response to a bias current that is a replica of the input current. The current mirror may include a pair of transistors and a pair of resistors, in which: a first resistor and a base of a first transistor are coupled to a first input terminal for a first input current, an emitter of the first transistor and a base of the second transistor are coupled to a second input terminal for a second input current, the first and second input currents being replicas of each other, an emitter of the second transistor being coupled to the second resistor, a collector of the second transistor being coupled to an output terminal of the current mirror, and a collector of the first transistor and the two resistors are coupled to a common node.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.