Operational amplifier having improved slew rate/bandwidth characteristics
US4390850A · kind A · utility
6Cited by
0References
8Claims
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Assignee
Inventors
Key dates
| Filing date | Mar 16, 1981 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | Mar 16, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45188
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An operational amplifier includes in its first stage current splitting means which enables the slew rate to be varied independently of bandwidth. A pair of dual collector transistors are coupled between the amplifier's input devices and a current mirror circuit. Only one collector of each of the split collector devices is coupled to the current mirror circuit and the current flowing therethrough is controlled by varying the area of the second collector. Slew rate and bandwidth are then controlled by proper selection of current and the ratio of the collector areas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.