Recursive Filters for Time-Interleaved ADC Mismatch Compensation
Recursive Filters for Time-Interleaved ADC Mismatch Compensation
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DOI：
10.1109/tcsi.2016.2538061
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发表时间：
2016-05
期刊：
影响因子：
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通讯作者：
Saihua Xu;Y. Lim;Jun Wei Lee
中科院分区：
文献类型：
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作者：
Saihua Xu;Y. Lim;Jun Wei Lee
时间交错模数转换器（TIADC）失配补偿滤波器传统上是有限脉冲响应（FIR）滤波器。使用FIR滤波器的优点是FIR滤波器本身稳定，而且设计技术容易获得。本文证明了无限冲激响应（IIR）滤波器可以设计用于补偿TIADC中的失配误差。介绍了两种实现稳定性的方法，一种是通过增加群延迟，另一种是通过限制分母系数的大小。仿真结果表明，对于给定的杂散频率功率，所提出的IIR TIADC补偿滤波器与传统的FIR TIADC补偿滤波器相比，乘法器系数的总数节省约30%。IIR补偿滤波器的重要方面，如噪声传播，在识别误差的存在下，滤波器的重新设计，以科普失配漂移的性能也进行了研究。
Time-interleaved analog-to-digital converter (TIADC) mismatch compensation filters are traditionally finite impulse response (FIR) filters. The advantages of using FIR filters are that FIR filters are inherently stable and that the design techniques are readily available. This paper demonstrates that infinite impulse response (IIR) filters can be designed to compensate for the mismatch error in the TIADC. Two methods for achieving stability are introduced; one is by increasing the group delay and the other is by constraining the magnitudes of the denominator coefficients. Simulation examples show that, for a given spurious frequency power, the proposed IIR TIADC compensation filter yields about 30% saving in the total number of multiplier coefficients when compared to the conventional FIR TIADC compensation filter. Important aspects of the IIR compensation filter such as noise propagation, performance in the presence of identification error, filter redesign to cope with mismatch drifting are also investigated.