发明授权
US07796073B2 Current switch circuit and D/A converter, semiconductor integrated circuit, and communication device using the same
有权
电流开关电路和D / A转换器，半导体集成电路和使用其的通信装置
- 专利标题： Current switch circuit and D/A converter, semiconductor integrated circuit, and communication device using the same
- 专利标题（中）： 电流开关电路和D / A转换器，半导体集成电路和使用其的通信装置
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申请号： US12278367申请日： 2007-10-23
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公开(公告)号： US07796073B2公开(公告)日： 2010-09-14
- 发明人: Tomohiro Ogawa , Heiji Ikoma
- 申请人： Tomohiro Ogawa , Heiji Ikoma
- 申请人地址： JP Osaka
- 专利权人： Panasonic Corporation
- 当前专利权人： Panasonic Corporation
- 当前专利权人地址： JP Osaka
- 代理机构： McDermott Will & Emery LLP
- 优先权： JP2007-002608 20070110
- 国际申请： PCT/JP2007/070649 WO 20071023
- 国际公布： WO2008/084583 WO 20080717
- 主分类号： H03M1/66
- IPC分类号： H03M1/66
摘要：
In a current switch circuit A used for a current steering D/A converter, a current switch basic circuit 1 includes first and second transistors Tr121 and Tr122 included in a differential switch 12. A threshold voltage control circuit 5 has an output terminal Vbout controlling the substrate voltage to be outputted to the substrate terminal of each of the two transistors Tr121 and Tr122 included in the differential switch 12 for controlling the threshold voltage of the two transistors of the differential switch. Accordingly, the present invention improves the decrease in the dynamic range of the current switch basic circuit 1 dependent on the threshold of each of the two transistors in the differential switch 12 and realizes a wider output voltage range without causing deterioration in properties even in a case that the power voltage is reduced in the current switch basic circuit 1.