针对时间交替采样系统（TIADC）通道失配的校准问题,分析了TIADC通道失配现象误差的特征,建立了基于参考通道的系统校准模型,提出了一种多频参考误差法,通过快速频率估计及数值查表过程,即可完成有效的误差校准。进一步讨论了方法在系统全输入带宽内的适用性及其校准性能。实验仿真表明,多频参考误差法可将TIADC系统无杂散动态范围提高至少25 dB。
Abstract
Aiming at the problem of channel mismatch calibration in time-interleaved ADCs (TIADC), the characteristics of channel mismatch phenomena are firstly analyzed, then system calibration model is built based on reference channel, finally a new calibration approach called multi-frequency reference error method is introduced. This method can efficiently complete effective error compensation by fast frequency calculation and look up table. In addition to that, the applicability and calibration performance of the method in the whole input bandwidth of TIADC are further discussed. The simulation demonstrated that multi-frequency reference error method can improve the SFDR of TIADC beyond 25 dB.
关键词
计量学 /
多频参考误差法 /
通道失配 /
时间交替ADC系统
Key words
Metrology /
Multi-frequency reference error method /
Channel mismatch /
Time-interleaved ADC system
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