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用于高速DDS中电流舵DAC的基准电流源设计

更新时间:2020-09-11 06:52:07 大小:881K 上传用户:IC老兵查看TA发布的资源 标签:ddsdac 下载积分:2分 评价赚积分 (如何评价?) 打赏 收藏 评论(0) 举报

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介绍一种用于高速DDS中电流舵DAC的带隙基准电流源电路,在传统带隙基准源电路的基础上将产生△%。的两个三极管基极相连,使用两个运放分别将其集电极与基极钳至于相同电位,在保证三极管处于饱和区的基础上消除传统基准电路中由运放失调带来的误差‰,通过温度补偿电路,补偿V8E与温度T的非线性项。电路采用0.18μm的深N阱1P5M工艺,选用NPN型三极管,仿真结果表明tt条件下基准电压输出温漂系数≈10× 10-9/℃,基准电流输出温漂系数≈10× 10-9/℃。

A reference current source circuit for the current-steering DAC in the high speed DDS ( Digital Direct Fre- quency Synthesis)was introduced, as foundation of the traditional reference current source circuit, the base of the two triodes were connected which produced the AVBE ,and then two amplifiers,were added to make the collector and the base clamp at the same potential. So the transistors in the condition of the saturation region to delete the error Vo, that caused by the offset of the amplifiers. The Vos was eliminated in the reference current source circuit. In addition, a circuit for compensating the nonlinear term that is in the expression of VSE to T is proposed. Fabricated by 0.18 μm N-wells 1 P5 M pro...

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用于高速DDS中电流舵DAC的基准电流源设计.pdf 881K

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