Blind equalization of time errors in a time-interleaved ADC system
Blind equalization of time errors in a time-interleaved ADC system
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DOI：
10.1109/tsp.2005.843706
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发表时间：
2005-04
影响因子：
5.4
通讯作者：
J. Elbornsson;F. Gustafsson;J. Eklund
中科院分区：
文献类型：
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作者：
J. Elbornsson;F. Gustafsson;J. Eklund
为了显著提高模数转换器（ADC）的采样速率，时间交错ADC系统是一个不错的选择。时间交织ADC系统的缺点是，由于制造过程中的误差，ADC并不完全相同。这意味着ADC系统中会引入时间、增益和失调失配误差。这些误差导致采样信号的失真。本文提出了一种时间失配误差的估计和补偿方法。该估计方法不需要关于输入信号的知识，除了对于完整的ADC系统，其频带应限于折叠频率/spl pi//T/sub s/。这意味着可以在ADC运行时估计误差。该方法也是自适应的时间误差的缓慢变化。的Cramer-Rao界（CRB）的时间误差估计也计算和Monte Carlo模拟相比。估计方法也已验证的测量从真实的时间交错ADC系统与16个ADC。
To significantly increase the sampling rate of an analog-to-digital converter (ADC), a time-interleaved ADC system is a good option. The drawback of a time-interleaved ADC system is that the ADCs are not exactly identical due to errors in the manufacturing process. This means that time, gain, and offset mismatch errors are introduced in the ADC system. These errors cause distortion in the sampled signal. In this paper, we present a method for estimation and compensation of the time mismatch errors. The estimation method requires no knowledge about the input signal, except that it should be band limited to the foldover frequency /spl pi//T/sub s/ for the complete ADC system. This means that the errors can be estimated while the ADC is running. The method is also adaptive to slow changes in the time errors. The Cramer-Rao bound (CRB) for the time error estimates is also calculated and compared to Monte Carlo simulations. The estimation method has also been validated on measurements from a real time-interleaved ADC system with 16 ADCs.