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CM amplifier divided output supplying first, second, CM amplifier inputs
专利权人:
Vineet Mishra
发明人:
Vineet Mishra
申请号:
US13158236
公开号:
US08792650B2
申请日:
2011.06.10
申请国别(地区):
US
年份:
2014
代理人:
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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