Calibration Method Considering Second-Order Error Term of Timing Skew for A Novel Multi-Channel ADC
The mismatch of timing skew between ADC channels restricts the performance of time-interleaved analogto-digital converters (TIADCs) seriously. In our previous work, we proposed a novel 7-channel TIADC and its timing skew calibration based on dual-ADC mutual calibration, in which only the first-order term of timing skew is calibrated. In this paper, insufficiency of first-order calibration for timing skew is discussed and an improved calibration scheme, which calibrates the first two order terms of timing skew, is proposed. Simulation of the 14-bit TIADC with MATLAB shows that with timing skew in the range of ±0.027Ts, and the normalized input frequency finlfs=034, SNDR and SFDR of the output signal of the TIADC are only 50.7dBc and 53.2dBc, and reach 74.1dBc and 79.8dBc after first-order calibration. However, SNDR and SFDR achieve 86.1dBc and 105dBc after calibration through the improved scheme, and the TIADC performance is enhanced significantly.
Yong-sheng Yin Rui Zhang Jun Yang Ming-lun Gao
Institute of VLSI Design, Hefei University of Technology, Hefei, 230009, China
国际会议
2011 IEEE 9th International Conference on ASIC(2011年第九届IEEE国际专用集成电路大会)
厦门
英文
1020-1023
2011-10-25（万方平台首次上网日期，不代表论文的发表时间）