Driver circuit with gradual voltage ramp up and ramp down
US7154308B2 · kind B2 · utility
8Cited by
6References
32Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 30, 2004 |
| Grant date | Dec 26, 2006 |
| Priority date | — |
| Expiry date | Oct 23, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K4/026
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A driver circuit is disclosed comprising an amplifier, a data DAC, and a voltage control mechanism (VCM). During a power up sequence, the VCM provides gradually increasing voltage signals to the amplifier to cause a voltage at the output of the amplifier to increase gradually. During a power down sequence, the VCM provides gradually decreasing voltage signals to the amplifier to causes the voltage at the output of the amplifier to decrease gradually. By gradually increasing and decreasing the voltage at the output of the amplifier in this way, pop noise caused by a rapid change in voltage can be reduced or even eliminated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.