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1. 发明申请

US20050035892A1 SPLIT CELL BOWTIE DIGITAL TO ANALOG CONVERTER AND METHOD 失效
标题翻译：分离单元数字数字到模拟转换器和方法
公开(公告)号：US20050035892A1
公开(公告)日：2005-02-17
申请号：US10739860
申请日：2003-12-18
申请人： Don Devendorf , Erick Hirata , Lloyd Linder , Christopher Langit , Roger Kosaka
发明人： Don Devendorf , Erick Hirata , Lloyd Linder , Christopher Langit , Roger Kosaka
IPC分类号： H03M1/06 , H03M1/74 , H03M1/80
CPC分类号： H03M1/0643 , H03M1/745
摘要： A DAC (10) including an operational amplifier (12) having an input terminal; a plurality of current paths coupled to the input terminal; a plurality of current sources (I1/2-I4/2); and an arrangement (11) for switchably coupling current from at least two of the cells to a respective one of the paths in response to an input signal. In a specific embodiment, the inventive DAC (10) further includes a first resistive element (2R1-2R4) disposed in each of the current paths, a second resistive element (R1-R4) disposed between the current paths, and a feedback resistor (RF) disposed between an output terminal of the amplifier and the input terminal thereof. In the illustrative embodiment, the coupling arrangement includes a plurality of switches (SW1-SW4); each of the switches is adapted to switch half of the current from a first source and half of the current from a second source into a respective one of the paths. The invention is adapted to lower the distortion of digital to analog converters by improving differential nonlinearities and integral nonlinearities, caused primarily by current source gradient errors, without the need for trimming.
摘要翻译：包括具有输入端的运算放大器（12）的DAC（10）耦合到所述输入端的多个电流通路; 多个电流源（I1 / 2-I4 / 2）; 以及用于响应于输入信号将来自至少两个单元的电流可切换地耦合到相应的一个路径的装置（11）。在具体实施例中，本发明的DAC（10）还包括设置在每个电流路径中的第一电阻元件（2R1-2R4），设置在电流路径之间的第二电阻元件（R1-R4）和反馈电阻器 RF）设置在放大器的输出端和其输入端之间。在说明性实施例中，耦合装置包括多个开关（SW1-SW4）; 每个开关适于将来自第一源的电流的一半和来自第二源的电流的一半切换到相应的一个路径。本发明适用于通过改善主要由电流源梯度误差引起的差分非线性和积分非线性来降低数模转换器的失真，而不需要修整。

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