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5位1.5 GHz采样频率的Flash ADC的设计及数字后台校正实现

Keywords: Flash模数转换器,高速转换,Volterra级数,数字后台校正平台

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Abstract:

基于TSMC0.18μm工艺设计了一个单通道5位,1.5GHzFlash模数转换器(ADC),该ADC通过改进跟踪保持电路和采用动态比较器结构实现了数据的高速转换.仿真结果表明,当输入信号达到奈奎斯特频率时,信号与噪声加谐波失真比(SNDR)为24.04dB,无杂散动态范围(SFDR)为29.97dB.为进一步提高此ADC的性能,消除非线性,基于Volterra级数搭建了数字后台校正模型.对比仿真结果,校正后谐波明显下降,SNDR提高了4.91dB,SFDR提高了6.94dB,有效位数提高了约0.82位.

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