Real time correction of a digital PWM amplifier
US6373334B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 2000 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Jun 12, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/506
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Distortion and noise in high power digital PWM amplifiers is reduced by measuring the difference between the desired output signal and the actual output signal on a pulse by pulse basis. This analog error is converted into a digital signal with an analog to digital converter (ADC). The digital error signal is then used to correct the feedback of the delta sigma modulator in real time. Preferably, more than one moment of the modulator signal is corrected via the feedback. Preferably, the predictable error of the circuitry which is known a priori is also corrected by correcting the delta sigma modulator feedback. A specialized ADC allows the loop delay to be low, without compromising accuracy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.