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本文提出了一种12位1.25GS/s的电流舵DAC，采用90nm CMOS工艺，通过优化电流源结构和开关驱动技术，在高达500MHz输入频率下实现了超过70dB的无杂散动态范围（SFDR），有效解决了高频动态失真问题。
The current-steering DACs are commonly used in generating high-frequency signals [1-4]. A current-steering DAC comprises current cells of various sizes. Each of them contains a current source and a current switch. The DAC static linearity, specified as differential nonlinearity (DNL) and integral nonlinearity (INL), is mainly determined by the mutual matching and the output resistance of the current sources. The DAC also exhibits dynamic distortion. It is manifested as spurious-free dynamic range (SFDR) degradation. The SFDR decreases rapidly with increasing input frequency. There are two major sources of dynamic distortion, code-dependent switching transients (CDST) and code-dependent output-loading variation (CDLV). Switching transients are temporal disturbances in DAC output when the current switches in current cells make transitions. The output loading of a DAC varies when the output impedances of current cells change due to
Wei-Hsin Tseng, Chi-Wei Fan, Jieh-Tsorng Wu
National Chiao Tung University, Hsinchu, Taiwan