Class AB output amplifier stage
US5621357A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 1995 |
| Grant date | Apr 15, 1997 |
| Priority date | — |
| Expiry date | May 23, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/4521
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An AB class stage is described which comprises two complementary MOSFET final transistors connected in a push-pull manner between two supply terminals. In order to attain high linearity, low switching distortion, a high ratio between the maximum output current and the rest current, independence of the rest current from the temperature and manufacturing variables and a circuit simplicity, the circuits determining the rest current and those which provide current to the load are substantially independent of one another. More particularly, two transconductance amplifiers are provided which control the final transistors and are dimensioned so as to have zero output current in rest conditions, two voltage generators which determine the rest current and two resistors being connected between the gate electrodes of the final transistors and the supply terminals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.