Methods and circuits for frequency modulation that reduce the spectral noise of switching regulators
US7362191B2 · kind B2 · utility
25Cited by
2References
39Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 29, 2004 |
| Grant date | Apr 22, 2008 |
| Priority date | — |
| Expiry date | Dec 13, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2215/069
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention comprises methods and circuits for spread spectrum frequency modulation that reduce peak spectral noise at the outputs or inputs of switching regulators. More specifically, the present invention modulates the operating frequency of the switching regulator in accordance with a frequency modulation waveform having a shape coordinated to a peak noise amplitude waveform that describes the correlation between the operating frequency of a switching regulator and the peak noise amplitude at the regulator's input or output absent spread spectrum frequency modulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.