Code-independent output impedance: A new approach to increasing the linearity of current-steering DACs

Xueqing Li, Qi Wei, Huazhong Yang
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引用次数: 14

Abstract

This paper proposes a novel complementary current approach to eliminating the code-dependence in the output impedance of current-steering digital-to-analog converters (DACs), and increasing the spurious-free dynamic range (SFDR) significantly. A 14bit 1.0GS/s current-steering DAC design example shows an SFDR increase of 10∼15dB. In traditional designs, one major effect that degrades the linearity is the code-dependence of the DAC's output impedance, which becomes a bottleneck at high frequencies because of the parasitic capacitance in the current branches. By adding additional current sources and switches to keep the DAC's output impedance nearly constant at different digital input codes, the proposed approach increases the DAC's SFDR by tens of dBs.
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码无关输出阻抗:一种提高电流转向dac线性度的新方法
本文提出了一种新的互补电流方法来消除电流转向数模转换器(dac)输出阻抗中的码依赖性,并显著提高无杂散动态范围(SFDR)。一个14位1.0GS/s电流转向DAC设计示例显示SFDR增加10 ~ 15dB。在传统设计中,降低线性度的一个主要影响是DAC输出阻抗的代码依赖性,由于电流支路中的寄生电容,它在高频时成为瓶颈。通过增加额外的电流源和开关来保持DAC在不同数字输入码时的输出阻抗几乎恒定,该方法将DAC的SFDR提高了数十db。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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