发明申请
- 专利标题： Differential amplifier circuit, operational amplifier circuit, light-receiving amplifier circuit using the same, function selection circuit, and light-receiving circuit using the same
- 专利标题（中）： 差分放大器电路，运算放大器电路，使用其的光接收放大器电路，功能选择电路和使用其的光接收电路
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申请号： US11257146申请日： 2005-10-25
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公开(公告)号： US20060038619A1公开(公告)日： 2006-02-23
- 发明人: Hideo Fukuda , Shinichi Miyamoto
- 申请人： Hideo Fukuda , Shinichi Miyamoto
- 申请人地址： JP Kadoma-shi
- 专利权人： Matsushita Electric Industrial Co., LTD.
- 当前专利权人： Matsushita Electric Industrial Co., LTD.
- 当前专利权人地址： JP Kadoma-shi
- 优先权： JP2004-173529 20040611
- 主分类号： H03F3/08
- IPC分类号： H03F3/08
摘要：
A differential amplifier circuit, an operational amplifier circuit, and a light-receiving amplifier circuit using the same are provided, by which the influence of an on resistance of an analog switch is reduced during the switching of gain resistances. An NPN transistor Q2 having an emitted connected in common is connected to an NPN transistor Q1 of a differential amplifier circuit including the NPN transistors Q1 and Q3, PNP transistors Q4 and Q5, and a constant-current source 11, and analog switches ASW-1c and ASW-2c are inserted and connected to the collectors of the NPN transistors Q1 and Q2 and connected to the base and collector of the PNP transistor Q4 and the base of the PNP transistor Q5. Further, analog switches ASW-1b and ASW-2b are connected to the bases of the NPN transistors Q1 and Q2, respectively.
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