Improved offline calibration for DAC mismatch in low OSR ΣΔ ADCs with distributed feedback
Improved offline calibration for DAC mismatch in low OSR ΣΔ ADCs with distributed feedback
复制标题
改进了具有分布式反馈的低 OSR ΣΔ ADC 中 DAC 失配的离线校准
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
P. Rombouts
中科院分区：
文献类型：
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作者：
M. Bock;Amir Babaie;P. Rombouts
我们提出了一种离线校准方法来纠正分布式反馈sigmadelta调制A/ d转换器中由于DAC元件失配引起的非线性。与以前的方法相比，改进之处在于不仅可以校准第一个反馈DAC，还可以校准耦合到后期的DAC。这在具有低OSR的Sigma δ调制器的情况下是需要的，其中第二反馈DAC的贡献不应被忽视。该技术基于双音输入信号的校准测量。
We present an offline calibration method to correct the non-linearity due to DAC element mismatch in distributed feedback SigmaDelta-modulation A/D-converters. The improvement over previous methods is that not only the first feedback DAC is calibrated, but also the DACs that are coupled to later stages can be calibrated as well. This is needed in the case of Sigma Delta modulators with a low OSR, where the contribution of the second feedback DAC should not be neglected. The technique is based on a calibration measurement with a two-tone input signal.