Digital Estimation and Compensation of Analog Errors in Frequency-Interleaved ADCs

作者：Song, Jinpeng^*; Tian, Shulin; Hu, Yu-Hen; Ye, Peng; Yang, Kuojun; Guo, Lianping; Wei, Wentao

来源：Journal of Circuits, Systems, and Computers, 2019, 28(8): 1950134.

DOI：10.1142/S0218126619501342

• Analog-to-digital converter (ADC)
• filter bank
• analog error
• frequency-interleaving
• pole-zero signal modeling
• time-varying system

A novel digital compensation scheme for measuring, estimating and correcting linear weakly time-varying analog errors in frequency-interleaved analog-to-digital converters (FI-ADCs) is presented. This method features three important improvements over existing approaches: First, the Wigner-Ville distribution (WVD) is used to better estimate the nonstationary analog channel frequency response (ACFR) spectrum. Secondly, the estimated ACFR spectrum is approximated with a rational polynomial model using the l(1)-norm metric. The corresponding l(1)-norm minimization problem is solved using a primal-relaxed dual global optimization (PRD-GOP) method. Thirdly, the digital compensation circuitry is designed utilizing a preconditioned biconjugate gradient stabilized (BICGSTAB) algorithm that yields a computationally efficient solution. Numerical experimentations have been conducted and the outcomes validate the feasibility and superior performance of this proposed method.

• 出版日期2019-7
• 单位电子科技大学