发明授权
- 专利标题： Differential current source circuit in DAC of current driving type
- 专利标题（中）： 电流驱动型DAC中的差分电流源电路
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申请号： US156627申请日： 1993-11-24
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公开(公告)号： US5406135A公开(公告)日： 1995-04-11
- 发明人: Kazuhiko Kasai , Kenji Matsuo , Shinji Fujii , Yasukazu Noine
- 申请人： Kazuhiko Kasai , Kenji Matsuo , Shinji Fujii , Yasukazu Noine
- 申请人地址： JPX Kawasaki
- 专利权人： Kabushiki Kaisha Toshiba
- 当前专利权人： Kabushiki Kaisha Toshiba
- 当前专利权人地址： JPX Kawasaki
- 优先权： JPX4-316927 19921126
- 主分类号： G05F3/24
- IPC分类号： G05F3/24 ; H03F3/45 ; H03K17/041 ; H03K17/693 ; H03M1/74 ; H03M3/02 ; H03F3/16
摘要：
A differential current source circuit includes three P-channel MOSFETs and two N-channel MOSFETs. Each source of first and second P-channel MOSFETs is connected to a power supply, and a bias voltage is applied to each gate of the MOSFETs. A current path of the first N-channel MOSFET is connected between a drain of the first P-channel MOSFET and a ground. A current path of the third P-channel MOSFET is connected between a drain of the second P-channel MOSFET and a current output terminal. A gate of the third P-channel MOSFET is connected to the drain of the first P-channel MOSFET. One end of a current path of the second N-channel MOSFET is connected to a connecting point of the first P-channel and first N-channel MOSFETs, and the other end is connected to a connecting point of the second P-channel and third P-channel MOSFETs. A digital signal is applied to a gate of the second N-channel MOSFET.
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