发明授权
- 专利标题： Amplifier with input referred common-mode adjustment
- 专利标题（中）： 具有输入参考共模调节功能的放大器
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申请号： US905524申请日： 1997-08-04
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公开(公告)号： US5936469A公开(公告)日： 1999-08-10
- 发明人: Daniel D. Alexander , David J. Anderson
- 申请人： Daniel D. Alexander , David J. Anderson
- 申请人地址： IL Schaumburg
- 专利权人： Motorola, Inc.
- 当前专利权人： Motorola, Inc.
- 当前专利权人地址： IL Schaumburg
- 主分类号： H03F3/45
- IPC分类号： H03F3/45
摘要：
A circuit and method control the common-mode potential at an output (17, 18) of a fully differential amplifier (32) by feeding forward a common-mode correction signal through the amplifier. An input signal (V.sub.IN+ -V.sub.IN-) is amplified in the amplifier to produce a differential output signal (V.sub.O- -V.sub.O+) at the output. A common potential of the differential inputs (37, 38) of the amplifier is sensed with a transistor (54, 56) biased to a reference voltage (V.sub.CM) and amplified through the amplifier to produce a common-mode correction signal to offset a common-mode component of the differential output signal. A feedback circuit (33-36) is used to develop the common potential from the common-mode component.
公开/授权文献
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