AI Article Synopsis
- The text discusses the rapid development of time-interleaved analog-to-digital converters (TIADCs) in high-speed applications, highlighting the significant problem of channel mismatch errors.
- A novel adaptive calibration method is proposed to address timing skew mismatch errors, detailing the algorithm's principles and its practical implementation in a four-channel TIADC-based digital oscilloscope with a high sampling rate of 10 GS/s.
- The experimental results indicate that the calibration method effectively reduces timing skew errors, achieving a notable spurious-free dynamic range and an effective number of bits, along with a comparison of the algorithm's complexity.
Article Abstract
Because of the exponential increase of sampling rate, time-interleaved analog-to-digital converter (TIADC) has a fast growth in the high-speed applications. However, the channel mismatch error is a serious challenge for the performance of TIADC. In this article, we address the timing skew mismatch error and propose a novel adaptive calibration method. The principle and operating process of the calibration algorithm are explained. To validate the proposed technique, we designed a four-channel TIADC-based digital oscilloscope with a sampling rate of 10 GS/s. Based on this instrumentation platform, (i) calibration algorithm was implemented by hardware; and (ii) a test platform consisting of advanced instruments and tools was setup to testify the effect and robustness of proposed algorithm. Moreover, the technical details of instrumentation are described for the first time. The experimental results show that the calibration algorithm significantly suppresses the distortions due to timing skew mismatch error. The TIADC-based instrumentation achieves spurious-free dynamic range of 52.48 dB and effective number of bits of 5.83 bit, respectively. Besides, the complexity of the proposed algorithm is compared and discussed.
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