Current mirror
US7352235B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2004 |
| Grant date | Apr 1, 2008 |
| Priority date | — |
| Expiry date | Mar 23, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/265
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The present invention relates to Current mirror for generating a constant mirror ratio, comprising an output transistor (Tout) having a base, an emitter and a collector, wherein a current flowing through the collector of said output transistor (Tout) constitutes an output current (Iout) of said current mirror and the collector of said output transistor (Tout) is connectable to an output circuit, a buffer transistor having a base, an emitter and a collector, wherein the emitter of the buffer transistor is connected to the base of the output transistor, a buffer current source for providing a fixed buffer current, wherein said buffer current source is connected to the collector of the buffer transistor, and a buffer base voltage control means having an input connected to the base of the output transistor and an output connected to the base of the buffer transistor, wherein the base voltage control means is adapted to controlling a voltage at the base of the buffer transistor in response to a current at the input of the buffer base voltage control means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.