Half-voltage headphone driver circuit
US7991172B2 · kind B2 · utility
2Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 31, 2007 |
| Grant date | Aug 2, 2011 |
| Priority date | — |
| Expiry date | Jun 1, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2460/03
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention discloses a half-voltage headphone driver circuit, comprising: at least one operational amplifier providing an output to a headphone speaker, and a charge pump receiving a supply voltage (VDD), generating a positive half-voltage and a negative half-voltage (VDD/2 and −VDD/2) based on the supply voltage, and supplying the positive half-voltage and negative half-voltage as high and low operation levels to the at least one operational amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.