Class D amplifier system
US4178556A · kind A · utility
35Cited by
2References
4Claims
0Family size
Inventor
Key dates
| Filing date | Apr 19, 1978 |
| Grant date | Dec 11, 1979 |
| Priority date | — |
| Expiry date | Apr 19, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/217
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a Class D amplifier system comprising a pulse width modulator for pulse width modulating with an audio signal a carrier signal having a frequency higher than that of the audio signal, an output switching amplifier connected to the modulator, and a lowpass filter connected to the output amplifier to supply a demodulated audio signal to a load in which a trap circuit resonant at a carrier signal frequency is provided in the lowpass filter to permit part of an output signal from the trap circuit which is free from a carrier signal component to be negative-fed back to the pulse width modulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.