Rail-to-rail class-AB operational amplifier
US7508265B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 30, 2007 |
| Grant date | Mar 24, 2009 |
| Priority date | — |
| Expiry date | Oct 31, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45632
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A rail-to-rail class-AB operational amplifier includes a first differential pair unit for receiving a pair of differential signals and generating a first control signal; a second differential pair unit for receiving the pair of differential signals and generating a second control signal; and an output stage for receiving the first control signal and the second control signal and then generating an output voltage. The first differential pair unit includes a first active load, a first transistor differential pair and a first current source. The second differential pair unit includes a second current source, a second transistor differential pair and a second active load. The output stage includes a third current source, a fourth current source and a parallel transistor pair disposed between a second terminal of the third current source and a first terminal of the fourth current source, a first output transistor and a second output transistor, and generates the output voltage according to the first control signal and the second control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.