TITLE:
A Timing Skew Calibration Scheme in Time-Interleaved ADC
AUTHORS:
Jing Li, Yang Liu, Hao Liu, Shuangyi Wu, Ning Ning, Qi Yu
KEYWORDS:
Timing Skew; Background Calibration; Time-Interleaved; Analog-to-Digital Converters
JOURNAL NAME:
Journal of Computer and Communications,
Vol.1 No.6,
November
26,
2013
ABSTRACT: This paper proposes a digital
background calibration scheme for timing skew in time-interleaved
analog-to-digital converters (TIADCs). It detects the relevant timing error by
subtracting the output difference with the sum of the first derivative of the
digital output. The least-mean-square (LMS) loop is exploited to compensate the
timing skew. Since the calibration scheme depends on the digital output, all
timing skew sources can be calibrated and the main ADC is maintained. The
proposed scheme is effective within the entire frequency range of 0 ? fs/2.
Compared with traditional calibration schemes, the proposed approach is more
feasible and consumes significantly lesser power and smaller area.