Class AB operational amplifier and output stage quiescent current control method
US8130038B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 2010 |
| Grant date | Mar 6, 2012 |
| Priority date | — |
| Expiry date | Aug 10, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45641
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A class AB operational amplifier includes: a first transistor, for generating a first current; a second transistor, where a second source voltage of the second transistor is equal to a first source voltage of the first transistor, for generating an output stage quiescent current; and an output stage quiescent current controller, coupled to a gate and a source of the first transistor, for controlling a first drain-to-source voltage of the first transistor to be equal to a second drain-to-source voltage of the second transistor. A ratio of the output stage quiescent current to the first current is equal to a ratio of a second W/L ratio of the second transistor to a first W/L ratio of the first transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.