Digital calibration technique based AC injection for continuous‐time sigma‐delta converters

Abstract

In this study, a digital calibration method applicable for a continuous‐time sigma‐delta analogue‐to‐digital converter is proposed using the AC injection technique. The proposed technique directly calibrates the integration accuracy of a converter instead of only trimming the capacitors. Compared with the existing calibration methods, the proposed method does not require complex timing logic processing or additional capacitors and does not adversely impact the dynamic performance of the converter. Furthermore, it ensures the accuracy of the converter, regardless of the non‐ideal effects of advanced processes.

Guest Editorial: Digital‐based and digital‐intensive analog integrated circuits and systems

“…Digital-assisted calibration: Even before the last developments of radical digital-in-concept analogue IC design approaches, digital techniques have been and are still a valuable asset to improve the performance of more traditional analogue and mixed-signal circuits [13]. In this framework the Letter "Digital calibration technique-based AC injection for continuous time sigma-delta converters" by Shengling Zhu et al [14], presents an innovative digital calibration method based on AC signal injection for continuous-time sigma-delta analogue-to-digital converters. Compared to calibration techniques proposed in previous art, the new method does not require complex timing logic, processing or additional capacitors and does not adversely impact the dynamic performance of the converter.…”