Monolithic current mirror circuit employing voltage feedback for .beta.-independent dynamic range
US5373253A · kind A · utility
16Cited by
5References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1993 |
| Grant date | Dec 13, 1994 |
| Priority date | — |
| Expiry date | Sep 20, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/345
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A monolithic bipolar current mirror circuit having linear mirror-gain over four orders of current magnitude independent of device-beta (even if .beta..fwdarw.1). A third bipolar feedback transistor coupled to a unipolar buffer transistor provides voltage feedback to eliminate input loading and thereby eliminate the dependence of mirror-gain on device current-gain. The bipolar current mirror circuit can be frequency compensated and can be implemented using either PNP or NPN devices in BiCmos integrated circuit technology.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.