Invention Grant
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
- Patent Title: Current switch circuit and D/A converter, semiconductor integrated circuit, and communication device using the same
- Patent Title (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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Application No.: US12278367Application Date: 2007-10-23
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Publication No.: US07796073B2Publication Date: 2010-09-14
- Inventor: Tomohiro Ogawa , Heiji Ikoma
- Applicant: Tomohiro Ogawa , Heiji Ikoma
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: McDermott Will & Emery LLP
- Priority: JP2007-002608 20070110
- International Application: PCT/JP2007/070649 WO 20071023
- International Announcement: WO2008/084583 WO 20080717
- Main IPC: H03M1/66
- IPC: H03M1/66

Abstract:
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.
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