Method and apparatus for efficient and distortion compensated digital class-D amplifier ternary modulation scheme
US9048794B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 2011 |
| Grant date | Jun 2, 2015 |
| Priority date | — |
| Expiry date | Feb 29, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/351
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present disclosure generally relates to the field of digital Class-D amplifiers and more specifically to a technique for reducing output waveforms distortion of a digital class-D amplifier implementing a ternary modulation scheme. An apparatus embodiment comprises an enlarging component for enlarging at least one pulse of a first output waveform PWM_P_TERN′ of the amplifier 50 by a first enlarging pulse, wherein the at least one pulse of the first output waveform PWM_P_TERN′ is symmetrically enlarged by the first enlarging pulse with respect to the center position of the at least one pulse; and a pulses generating component for generating at least one first compensating pulse comp_pulse_p and for adding the generated at least one first compensating pulse comp_pulse_p on a second output waveform PWM_N_TERN′ of the amplifier 50, wherein the at least one first compensating pulse comp_pulse_p has substantially the same width P as the first enlarging pulse and is added on the second output waveform PWM_N_TERN′ at a position which corresponds to the center position of the at least one pulse of the first output waveform PWM_P_TERN′.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.