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| alibration of Channel Mismatches in Time-interleaved ADCs Based on Multi-Frequency Reference Error Method |
| ZHANG Hao,SHI Yi-bing,WANG Zhi-gang,ZHU Zhao-xuan |
| School of Automation and Engineering, University of Electronic Science and Technology, Chengdu, Sichuan 611731, China |
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Abstract Aiming at the problem of channel mismatch calibration in time-interleaved ADCs (TIADC), the characteristics of channel mismatch phenomena are firstly analyzed, then system calibration model is built based on reference channel, finally a new calibration approach called multi-frequency reference error method is introduced. This method can efficiently complete effective error compensation by fast frequency calculation and look up table. In addition to that, the applicability and calibration performance of the method in the whole input bandwidth of TIADC are further discussed. The simulation demonstrated that multi-frequency reference error method can improve the SFDR of TIADC beyond 25 dB.
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2011, Vol. 32 
