发明名称 |
Multi-voltage headphone drive circuit |
摘要 |
The present invention discloses a multi-voltage headphone driver circuit comprising: at least one operational amplifier having an output supplied to a headphone speaker, the operational amplifier receiving a first power supply as its high operation voltage; a charge pump receiving a second power supply to generate a negative voltage corresponding to the second power supply in magnitude; and an m-fold circuit multiplying the negative voltage by m and providing the result to the operational amplifier as a low operation voltage thereof, wherein m is a real number. |
申请公布号 |
US8159294(B2) |
申请公布日期 |
2012.04.17 |
申请号 |
US20090460539 |
申请日期 |
2009.07.21 |
申请人 |
GUO JWIN-YEN;YANG CHING-HSIANG;RICHTEK TECHNOLOGY CORPORATON |
发明人 |
GUO JWIN-YEN;YANG CHING-HSIANG |
分类号 |
H03G3/00 |
主分类号 |
H03G3/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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