Slew rate control and optimization of power consumption in a power stage
US5656969A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | May 24, 1995 |
| Grant date | Aug 12, 1997 |
| Priority date | — |
| Expiry date | May 24, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/0036
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Power consumption by the driving circuitry of an output stage, employing a slew-rate controlling operational amplifier, is reduced by modulating the level of the current output by the operational amplifier in function of the working conditions of the output stage. Switching delay may also be effectively reduced. An auxiliary current generator forces an additional current through the conducting one of the pair of input transistors of the operational amplifier only during initial and final phases of a transition, essentially when the slew rate control loop ceases to be effective. The boosting of the bias current through the conducting input transistor is determined by the degree of unbalance of the differential input stage of the operational amplifier, without the use of dissipative sensing elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.