Background Multi-Rate LMS Calibration Circuit for 15MHz-BW 74dB-DR CT 2-2 MASH ΔΣ ADC in 28nm CMOS

📋 论文概要

该论文提出了一种应用于连续时间2-2 MASH ΔΣ ADC的背景多速率LMS校准电路，旨在解决实际产品中ADC因输入过大和PVT变化导致的稳定性问题，并实现了15MHz带宽和74dB动态范围。

💡 主要创新点

• 提出背景多速率LMS校准技术，在不中断ADC正常运行的情况下校准MASH结构中的级间不匹配和电路非理想性。
• 采用多速率处理，降低校准电路的数字复杂度，同时保持校准精度和收敛速度。
• 在28nm CMOS工艺中实现了高动态范围、宽带宽的CT ΔΣ ADC，适用于自动驾驶等要求高精度的应用。

🏷 关键词

📄 原文摘要

indispensable component for autonomous driving. A continuous-time (CT) ∆Σ ADC is expected to be suitable for this application due to its high precision and wide bandwidth as well as inherent anti-aliasing effect. However, the stable performance of the ADC against excessive input and PVT variations is a primary issue for real products which has so far not been addressed sufficiently. Since a high OSR for a wide-band CT ∆Σ ADC requires a prohibitively high sampling rate, the higher-order noise shaping [1] needs to be applied instead. In addition, the MASH structure [2-3] is preferred due to its robustness against the instability caused by excessive input. However, since the analog transfer function of a CT MASH ∆Σ ADC is vulnerable to PVT variations, significant

👥 作者与机构

Mitsuya Fukazawa1, Takashi Oshima2, Masaki Fujiwara1,

Katsuki$Tateyama1, Alsubaie Raed1, Masao Ito1, Tetsuya Matsumoto1, Tetsuo Matsui1 Renesas Electronics, Tokyo, Japan Hitachi, Tokyo, Japan 1 2 The mm-wave radar is an