Estimation and Correction of Gain Mismatch and Timing Error in Time-Interleaved ADCs Based on DFT

Abstract

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.

Keywords

• correction
• estimation
• gain mismatch
• time-interleaved analog-to-digital converter
• timing error