并行采集系统通道失配误差测量及校正

并行时间交替采样结构是一种有效地提高采样率的方法,但在采用此结构的采集系统中,多个ADC通道间的失配误差严重影响采集系统的性能,国内外对失配误差的测量和校正多采用加测试信号的方法。该文通过理论分析得出一种不需要测试信号且适用信号范围广泛的误差测量算法,并对国外文献中盲算法估计时间误差的方法进行了改进。计算机仿真证实了该方法对误差的估计有极高的精确度,能有效地提高采集系统性能。

Measurement and Calibration of Channel Mismatch Errors in Time-Interleaved ADC

The time-interleaved ADC structure is one way to increase the sampling rate. However, channel mismatch errors of this structure will increasingly degrade the performance of the whole system. For this reason, adding test signal is widely used when measuring and calibrating the mismatch errors. This paper propose a method which measure mismatches without the need of any special calibration signal and therefore has wide applications. Furthermore, the method of error estimation of blind algorithm is improved. The computer simulations show that the method estimates errors with high accuracy and can improve the performance of the system effectively.