Pulse-width modulation amplifier and suppression of clipping therefor
US7315202B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 2005 |
| Grant date | Jan 1, 2008 |
| Priority date | — |
| Expiry date | Oct 2, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/66
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A pulse-width modulation (PWM) amplifier is adapted to a class-D amplifier in which an analog input signal is subjected to integration, pulse-width modulation, and switched amplification, wherein a glitch elimination circuit eliminates noise from a pulse-width modulated signal, from which a high pulse signal and a low pulse signal are isolated such that each pulse is delayed by a dead time at the leading-edge timing thereof. When both of them are simultaneously set to a high level, one of them is reduced in level. In response to the occurrence of clipping, an integration constant applied to an operational amplifier is automatically changed from a primary integration constant to a secondary integration constant. When the clipped state is sustained for a prescribed time, an inversion pulse is compulsorily introduced into the pulse-width modulated signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.