Headphone amplifier circuit
US7880548B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 2008 |
| Grant date | Feb 1, 2011 |
| Priority date | — |
| Expiry date | Oct 21, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/30072
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A class G headphone amplifier circuit with improved power efficiency and low EMI. It may use an automatic signal level detector to detect the signal level of incoming signals and determine positive and negative power supplies for headphone amplifiers accordingly. A voltage generator may generate pairs of differential output voltages at a plurality of amplitude steps, and supply to headphone amplifiers the pair with the amplitude determined by the automatic signal level detector. As a result, headphone amplifiers are biased according to the input signal level, and the multiple voltage rails may improve power efficiency and avoid clipping.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.