Method and apparatus for filter-less analog input class D audio amplifier clipping
US8917143B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 2012 |
| Grant date | Dec 23, 2014 |
| Priority date | — |
| Expiry date | Jan 12, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/2173
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An integrated circuit (IC) chip has a class D PWM (pulse width modulation) amplifier configured for generating first and second PWM signals. The class-D PWM modulator includes a differential output driver configured for driving a first and a second output signals in response to the first and the second PWM signals. A clipping detection circuit is configured to turn on a clipping indication signal when one or both of the first PWM signal and the second PWM signal maintain the same state between two consecutive edges of the oscillator clock signal. The clipping detection circuit is also configured to turn off the clipping indication signal when both the first PWM signal and the second PWM signal change states between two consecutive edges of the oscillator clock signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.