SPLIT-ADC BASED DIGITAL BACKGROUND CALIBRATION FOR TIME-INTERLEAVED ADC  

作　　者：Zhang Rui Yin Yongsheng Gao Minglun 

机构地区：[1]Institute of Very Large Scale Integration,Hefei University of Technology,Hefei 230009,China

出　　处：《Journal of Electronics(China)》2012年第3期302-309,共8页电子科学学刊（英文版）

基　　金：Supported by the National Natural Science Foundation of China (No. 61076026)

摘　　要：A novel Time-Interleaved Analog-to-Digital Converter (TIADC) digital background calibration for the mismatches of offsets, gain errors, and timing skews based on split-ADC is proposed. Firstly, the split-ADC channels in present TIADC architecture are designed to convert input signal at two different channel sampling rates so that redundant channel to facilitate pair permutation is avoided. Secondly, a high-order compensation scheme for correction of timing skew error is employed for effective calibration to preserve high-resolution when input frequency is high. Numerical simulation performed by MATLAB for a 14-bit TIADC based on 7 split-ADC channels shows that Signal-to-Noise and Distortion Ratio (SNDR) and Spurious Free Dynamic Range (SFDR) of the TIADC achieve 86.2 dBc and 106 dBc respectively after calibration with normalized input frequency near Nyquist frequency.A novel Time-Interleaved Analog-to-Digital Converter （TIADC） digital background cali- bration for the mismatches of offsets, gain errors, and timing skews based on split-ADC is proposed. Firstly, the split-ADC channels in present TIADC architecture are designed to convert input signal at two different channel sampling rates so that redundant channel to facilitate pair permutation is avoided. Secondly, a high-order compensation scheme for correction of timing skew error is employed for effective calibration to preserve high-resolution when input frequency is high. Numerical simulation performed by MATLAB for a 14-bit TIADC based on 7 split-ADC channels shows that Signal-to-Noise and Distortion Ratio （SNDR） and Spurious Free Dynamic Range （SFDR） of the TIADC achieve 86.2 dBc and 106 dBc respectively after calibration with normalized input frequency near Nyquist frequency.

关 键 词：Time-Interleaved Analog-to-Digital Coverter (TIADC) Split architecture Digital background calibration Adaptive calibration High-order timing skew compensation 

分 类 号：TP335[自动化与计算机技术—计算机系统结构]