A 10b 2.6GS/s Time-Interleaved SAR ADC with Background Timing-Skew Calibration

📋 论文概要

该论文提出了一种10位2.6GS/s的时间交织SAR ADC，通过背景时序偏差校准技术解决了多通道采样中的时序失配问题，实现了高带宽和高能效，适用于WiGig和5G等射频应用。

💡 主要创新点

• 提出了一种背景时序偏差校准算法，无需中断ADC正常工作即可实时校正时序误差。
• 采用数字域校准方法，避免了模拟校正带来的反馈稳定性问题和额外抖动。

🏷 关键词

📄 原文摘要

Recent radio architectures, such as WiGig and 5G, require ADCs with bandwidth beyond 1GHz and ENOB of 6-to-8b while retaining excellent power efficiency for long battery life. Therefore, many time-interleaved SAR ADCs are used in a distributed sampling scheme, leaving the timing-skew problem to be resolved by calibration. Only a few timing-skew calibration algorithms have been reported for interleaved ADCs to correct timing error in the analog domain [1,2] or in the digital domain [3]. The drawback of analog correction includes the feedback-induced stability hazard and jitter introduced by the controlled delay line. Digital-domain correction takes advantage of technology scaling but the complex slope-extraction filter limits signal bandwidth. The reported ADC demonstrates a digital timingskew correction technique incorporated with a delta-sampling technique, and achieves a 2.6GHz sampling rate and a wide signal bandwidth.

👥 作者与机构

Chin-Yu Lin, Yen-Hsin Wei, Tai-Cheng Lee

National Taiwan University, Taipei, Taiwan