A Self-Calibrated 16GHz Subsampling-PLL-Based 30µs Fast Chirp FMCW Modulator with 1.5GHz Bandwidth and 100kHz rms Error

📋 论文概要

该论文提出了一种基于自校准16GHz子采样锁相环的快速调频连续波(FMCW)调制器，实现了30μs的快速啁啾时间、1.5GHz带宽和100kHz均方根频率误差，解决了自动驾驶雷达中速度-距离模糊和虚假检测问题。

💡 主要创新点

• 采用子采样锁相环结构实现低噪声高频啁啾调制，避免了传统分数N锁相环的量化噪声和复杂补偿。
• 引入自校准技术，自动校正子采样锁相环中的相位误差和非理想性，保证快速啁啾下的线性度。

🏷 关键词

📄 原文摘要

Sony Semiconductor Solutions, Atsugi, Japan 1 2 Frequency-modulated continuous-wave (FMCW) radars are critical for autonomous-driving applications. Sawtooth waveforms with short chirp time (<50μs) are desired to eliminate the speed-range ambiguity. The chirp signal needs to be linear to avoid spurious tones in the receiver baseband, which result in false detections. Furthermore, a wide chirping bandwidth (BWchirp > 4GHz) improves the range resolution to 3.75cm. To meet these requirements, fractionalN PLLs with two-point-modulation (TPM) scheme are presented in [1-3] with a relative rms FM error of 0.05% when normalized to the chirping bandwidth. In conventional FMCW PLLs, the lowpass signal injection is implemented through division ratio modulation in the PLL feedback path. However, the divider power consumption and noise are not negligible. In [4], a subsampling GMSK modulator improves the EVM. By using a high-resolution DTC, the divider quantization noise

👥 作者与机构

Qixian Shi1, Keigo Bunsen2, Nereo Markulic1, Jan Craninckx1

imec, Heverlee, Belgium