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Estimation and correction of gain mismatch and timing error in time-interleaved ADCs based on DFT

Guo L., Tian S., Wang Z.

Metrology and Measurement Systems

2014

Vol. 21, nr 3

535--544

Time-interleaved analog-to-digital converter (ADC) architecture is crucial to increase the maximum sample rate. However, offset mismatch, gain mismatch, and timing error between time-interleaved channels degrade the performance of time-interleaved ADCs. This paper focuses on the gain mismatch and timing error. Techniques based on Discrete Fourier Transform (DFT) for estimating and correcting gain mismatch and timing error in an M-channel ADC are depicted. Numerical simulations are used to verify the proposed estimation and correction algorithm.