Current amplifier
US4380740A · kind A · utility
9Cited by
3References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1980 |
| Grant date | Apr 19, 1983 |
| Priority date | — |
| Expiry date | Oct 31, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/343
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A current amplifier having a gain factor substantially independent of the common emitter forward current gain (beta) of its component transistors uses a cascade arrangement of current mirror amplifiers (CMA's) to compensate for variations in beta. The output of a first CMA, which current transfer ratio thereof decreases as beta decreases, is connected to the input of a second CMA, which current transfer ratio thereof increases as beta decreases. The composite current gain of the combined first and second CMA's therefore tends to remain constant as the respective betas vary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.