Operational amplifier having two differential amplifiers
US5936468A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1997 |
| Grant date | Aug 10, 1999 |
| Priority date | — |
| Expiry date | Nov 3, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45708
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An operational amplifier includes two differential amplifiers, one of which is driven directly while the other is driven via two potential shifting members. Using a control stage, currents are derived from common differential current output nodes of the differential amplifiers, and are mirrored as a current difference on an output of the operational amplifier. A larger input and output driving range is thus obtained, and the operational amplifier is also capable of operating with a low supply voltage. Furthermore, the operational amplifier can be constructed using a relatively simple configuration and also has an output which is suitable for high-impedance switching.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.