A 40.5-to-58.5GHz 36%-Fractional-Chirp-Bandwidth 18GHz-Absolute-Chirp-Bandwidth 2.2GHz/μs-Chirp-Rate 0.02%-Chirp-Error Post-Mixing Bandwidth-Extending Sawtooth-FMCW Frequency Synthesizer Employing a Chirp-Tracking ILFT and a Fractional-Bandwidth Doubler

📋 论文概要

本文提出了一种18GHz带宽的锯齿波FMCW合成器，采用chirp-tracking ILFT与前馈频率跟踪环路，以及分数带宽倍频器，实现了40.5至58.5GHz的36%分数带宽锯齿波调制，解决了高速率、大带宽FMCW信号的线性度问题。

💡 主要创新点

• 提出chirp-tracking ILFT结构，结合前馈与频率跟踪环路，实现快速chirp的鲁棒连续跟踪
• 设计分数带宽倍频器，支持锯齿波生成并同时扩展带宽和分数带宽，将chirp误差减半

🏷 关键词

📄 原文摘要

*Equally Credited Authors (ECAs) Abstract An 18GHz-bandwidth (BW) sawtooth-FMCW synthesizer is presented. First, a chirp-tracking ILFT with feed-forward and frequency-tracking loop ensures robust and continuous tracking of fast chirps. Second, a fractional-BW (FBW) doubler enables sawtooth generation and extends both the BW and FBW while halving the chirp error. The synthesizer measures a 36% FBW sawtooth FMCW chirp from 40.5 to 58.5GHz with a 0.02% chirp error at a chirp rate of 2.2GHz/&s without DCO-nonlinearity digital pre-distortion. Mm-Wave (mmW) FMCW radar systems require frequency synthesizers (FSs) with wide chirp absolute bandwidths (ABWs) and chirp fractional bandwidths (FBWs), as well as fast chirp rates and high chirp linearity. Sawtooth FMCW chirps are preferred over triangular ones for multi-object detection [1-6] but are more challenging to generate. Conventional sawtooth FMCW FSs rely on complex DCO-nonlinearity (NL) digital pre-distortion (DPD) to

👥 作者与机构

Yi Liu*, Zixi Jing*, Wen Yang, Hanlin Yang, Bodong Zhang, Howard Cam Luong

HKUST, Hong Kong, China