发明授权
US07589587B2 Feedback amplifier circuit operable at low voltage by utilizing switched operational amplifier and chopper modulator
失效
反馈放大器电路通过利用开关运算放大器和斩波调制器在低电压下工作
- 专利标题： Feedback amplifier circuit operable at low voltage by utilizing switched operational amplifier and chopper modulator
- 专利标题（中）： 反馈放大器电路通过利用开关运算放大器和斩波调制器在低电压下工作
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申请号： US11896899申请日： 2007-09-06
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公开(公告)号： US07589587B2公开(公告)日： 2009-09-15
- 发明人: Takeshi Yoshida , Yoshihiro Masui , Atsushi Iwata , Kunihiko Gotoh
- 申请人： Takeshi Yoshida , Yoshihiro Masui , Atsushi Iwata , Kunihiko Gotoh
- 申请人地址： JP Kanagawa
- 专利权人： Semiconductor Technology Academic Research Center
- 当前专利权人： Semiconductor Technology Academic Research Center
- 当前专利权人地址： JP Kanagawa
- 代理机构： Wenderoth, Lind & Ponack, L.L.P.
- 优先权： JP2006-242728 20060907
- 主分类号： H03F1/02
- IPC分类号： H03F1/02
摘要：
In a feedback amplifier circuit, a first switching device executes an auto-zero operation by inputting a signal outputted from an amplifier to an input terminal of the amplifier during an auto-zero operation interval prior to an amplification interval. A first capacitor accumulates and holds an offset voltage at the output terminal of the amplifier during the auto-zero operation interval, and cancels an offset voltage at the input terminal of the amplifier by an accumulated and held offset voltage during an amplification interval subsequent to the auto-zero operation interval. A second switching device grounds the feedback point of the feedback circuit during the auto-zero operation interval. A second capacitor blocks a DC voltage, and accumulates and holds an offset voltage at an output terminal of the amplifier, and cancels an offset voltage at an input terminal of the amplifier by the accumulated and held offset voltage during an amplification interval.