Class AB rail-to-rail input and output operational amplifier
US7545214B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 2007 |
| Grant date | Jun 9, 2009 |
| Priority date | — |
| Expiry date | Jul 27, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45091
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An operational amplifier including an input stage. The input stage may include first and second differential input circuits and a first current mirror. When an input terminal of the operational amplifier is at a positive voltage rail, the first differential input circuit may be activated. When the input terminal is at a negative voltage rail, the second differential input circuit may be activated. In either case, this may cause the first current mirror to provide a current of a predetermined value to each of first and second input terminals of a control circuit, and to each of first and second nodes coupled to a rail-to-rail output stage. The input stage may maintain the current provided to each of the input terminals of the control circuit and to each of the nodes coupled to the rail-to-rail output stage constant over the full input voltage range from the negative voltage rail to the positive voltage rail.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.