Integrated unit gain output stage
US6150853A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1995 |
| Grant date | Nov 21, 2000 |
| Priority date | — |
| Expiry date | Feb 27, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/30129
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The operation of externally connected output power transistors of a class AB amplifier is controlled without employing any external sensing resistance of the output current by driving an externally connected power transistor through a level shifting buffer and employing a limiting network composed of an integrated transistor driven by the output of a signal amplifying stage and a resistance connected in series with its drain. The buffer stage shifts the level of the driving signal of the external power transistor by a value equal to the threshold voltage of the integrated transistor of the limiting network thus ensuring the turn-off of the external power transistor under quiescent conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.