发明申请
- 专利标题: Stereo Headset Amplifier
- 专利标题(中): 立体声耳机放大器
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申请号: US13158236申请日: 2011-06-10
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公开(公告)号: US20120314880A1公开(公告)日: 2012-12-13
- 发明人: Vineet Mishra
- 申请人: Vineet Mishra
- 申请人地址: US TX Dallas
- 专利权人: Texas Instruments Incorporated
- 当前专利权人: Texas Instruments Incorporated
- 当前专利权人地址: US TX Dallas
- 主分类号: G10K11/16
- IPC分类号: G10K11/16 ; H03F1/34 ; H03F99/00 ; H03F3/68
摘要:
A driver circuit includes a first driver amplifier that is configured to generate a first output in response to a first reference voltage input and a first audio input; a second driver amplifier that is configured to generate a second output in response to the first reference voltage and a second audio input; and a common mode (CM) amplifier, coupled to the first driver amplifier and the second driver amplifier. The CM amplifier is configured to generate an output in response to a second reference voltage input, the first reference voltage input being a divided version of the output. Gains of the first driver amplifier, second driver amplifier and the CM amplifier are equal. Noise at the output appears across a plurality of resistors coupled at the outputs of the first driver amplifier, second driver amplifier and the CM amplifier and cancels with respect to the output of the CM amplifier.
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