A digital-mixing-based method for timing skew estimation in time-interleaved ADCs. (September 2019)

• Record Type: Journal Article
• Authors: Li, Xin; Ding, Desheng; Yan, Chenggang; Wu, Jianhui
• Is Part Of: Microelectronics journal. Volume 91(2019)
• Page Start: 46
• Page End: 52
• Publication Date: 2019-09
• Subjects: Analog-to digital converters -- Time-interleaved -- Mismatch -- Timing skew -- Estimation -- Digital-mixing-based; Microelectronics -- Periodicals; Microélectronique -- Périodiques; Microelectronics; Electronic journals; Journals - contents and abstracts; Periodicals; 621.3805
• DOI: 10.1016/j.mejo.2019.07.007
• Languages: English
• ISSNs: 0959-8324

Abstract

Abstract: Time-interleaving has been a popular choice for multi-GHz analog-to-digital converters (ADCs). Unfortunately, inherent defects such as offset, gain, timing-skew mismatches among sub-ADCs degrade overall performance seriously. At present, the method for eliminating offset and gain mismatch is fairly straightforward, however, calibration for timing-skew is still in a state of exploration. An efficient digital-mixing-based method to estimate timing skew in time-interleaved analog-to-digital converters (TI-ADCs) is proposed and verified. The timing skew can be estimated by digital-mixing and inverse sine function processing. The proposed method can greatly alleviate the effects of phase ambiguity. It is also insensitive to offset mismatch. A four-channel TI-ADC behavioral system of 10-bits 2 GS/s has been simulated to verify the performance of the method. Simulation results demonstrate that the method greatly improves the TI-ADC′s performance and is effective up to the severe timing skew mismatch.