A split-based fully digital feedforward background calibration technique for timing mismatch in TIADC

被引：5

作者：

Chen, Hongmei ^{[1
]}

Yin, Yongsheng ^{[1
]}

Liu, Tao ^{[2
]}

Gan, Linhao ^{[1
]}

Xiao, Rui ^{[1
]}

Yan, Hui ^{[1
]}

Deng, Honghui ^{[1
]}

机构：

[1] Hefei Univ Technol, Inst VLSI Design, Hefei 230009, Peoples R China

[2] Sci & Technol Analog Integrated Circuit Lab, Chongqing 400060, Peoples R China

来源：

INTEGRATION-THE VLSI JOURNAL | 2020年 / 71卷

关键词：

Time-interleaved ADC; Split; Timing mismatch; Feedforward; TIME-INTERLEAVED ADC;

D O I：

10.1016/j.vlsi.2019.11.009

中图分类号：

TP3 [计算技术、计算机技术];

学科分类号：

0812 ;

摘要：

This paper presents a split-based feedforward calibration technique for timing mismatch of Time-Interleaved Analog-to-Digital Converter (TI-ADC). The timing mismatch is estimated by using the difference between corresponding sample points of paired split-sub-ADCs, and compensated by a non-derivative interpolation method. Compared with traditional feedback methods with LMS iterative, the proposed feedforward calibration method can achieve much higher calibration speed and the complexity of digital post-processing is greatly relaxed without using of any dummy channel or filters. In addition, it has good calibration effects in both single-tone and multi-tone input conditions. Applied in a 1 GS/s 12-bit TIADC, the simulation result shows a convergence time of 1 x 10(4)Ts under Nyquist frequency input with 2%Ts initial timing mismatch, and the peak signal to noise and distortion ratio of TI-ADC is improved from 37.54 dB to 67.60 dB with a normalized frequency of single-tone input signal f(i)(n)/f(s) = 0.474. For a multi-tone input signal which contains 10 evenly distributed frequency points in the Nyquist frequency range, after calibration, the signal to noise and distortion improves 28.33 dB.

引用

页码：105 / 114

页数：10