Channel Mismatches Correction in Time-Interleaved ADCs Based on Hybrid Filter Bank Reconstruction  

作　　者：LIU Sujuan ZHUO Li JIANG Wenshu ZHANG Meihui 

机构地区：[1]College of Electronic Information and Control Engineering, Beijing University of Technology

出　　处：《Chinese Journal of Electronics》2014年第1期75-80,共6页电子学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.61106028);in part by the Scientific Research Project of Beijing Educational Committee(No.KM201110005006)

摘　　要：Time-interleaved analog-to-digital converter(TIADC) is an efficient way to achieve higher sampling rate for medium-to-high resolution applications. The performance of a TIADC suffers from the mismatch errors among the sub-channels. This paper presents a method to estimate the channel mismatches using the sub-channels output data. The proposed method introduces an equivalent transfer function for each channel to model and estimate the mismatch errors. A Hybrid filter bank(HFB)structure is used to both model the TIADC and reconstruct the desired uniformly sampled sequence based on the perfect reconstruction conditions of the HFB system.A four-channel 12-bit 400 MHz TIADC has been implemented in hardware to verify the proposed calibration method. The measured results show that the Spuriousfree dynamic range(SFDR) can be improved up to 74 d B after being corrected with 64-tap Finite-impulse response(FIR) filters.Time-interleaved analog-to-digital con- verter （TIADC） is an efficient way to achieve higher sam- pling rate for medium-to-high resolution applications. The performance of a TIADC suffers from the mismatch errors among the sub-channels. This paper presents a method to estimate the channel mismatches using the sub-channels output data. The proposed method introduces an equiv- alent transfer function for each channel to model and es- timate the mismatch errors. A Hybrid filter bank （HFB） structure is used to both model the TIADC and recon- struct the desired uniformly sampled sequence based on the perfect reconstruction conditions of the HFB system. A four-channel 12-bit 400MHz TIADC has been imple- mented in hardware to verify the proposed calibration method. The measured results show that the Spurious- free dynamic range （SFDR） can be improved up to 74dB after being corrected with 64-tap Finite-impulse response （FIR） filters.

关 键 词：Time-interleaved （TI） Analog-to-digitalconverter （ADC） Channel mismatch Hybrid filter bank（HFB）. 

分 类 号：TN792[电子电信—电路与系统] TN713