Low distortion output stage
US5442309A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 14, 1993 |
| Grant date | Aug 15, 1995 |
| Priority date | — |
| Expiry date | Dec 14, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/3001
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A low distortion, low power output stage comprises a differential amplifier which replaces the source follower and constant current sources found in conventional output stages. Because there is no voltage drop between the inverting and noninverting differential inputs of the amplifier, no voltage drop exists between the input and output of the output stage. Thus, the gain stage or stages which precede the output stage are not required to swing above the output swing of the output stage. Additionally, because the amplifier has a common mode range which allows it to swing nearly rail-to-rail, the output of the output stage also swings nearly rail-to-rail.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.