Modulation scheme for filterless switching amplifiers with reduced EMI
US6614297B2 · kind B2 · utility
58Cited by
2References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 6, 2001 |
| Grant date | Sep 2, 2003 |
| Priority date | — |
| Expiry date | Jul 6, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/384
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A ternary modulation scheme for filterless switching amplifiers with reduced EMI reduces the common mode component of the signal by allowing only one state with zero differential voltage across the load to exist. The ternary modulation scheme is more efficient than the quaternary modulation scheme when applied to class-D filterless switching amplifiers since the gates of the power MOSFETs are being charged and discharged at only a small duty cycle instead of 50% duty cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.