A 3-to-10GHz 14-Band CMOS Frequency Synthesizer with Spurs Reduction for MB-OFDM UWB System

📋 论文概要

本文提出一种用于MB-OFDM UWB系统的3-10GHz 14频段CMOS频率合成器，采用单边带混频架构实现全频段覆盖，并引入杂散抑制技术以满足快速跳频（<9.5ns）要求。解决了传统多PLL或复杂分频器方案在面积和功耗上的局限。

💡 主要创新点

• 提出基于单PLL的14频段全频段频率合成架构，无需多个锁相环或复杂分频器。
• 采用杂散抑制技术降低单边带混频产生的寄生分量，满足UWB系统对频谱纯净度的要求。

🏷 关键词

📄 原文摘要

As proposed by MB-OFDM alliance, the spectrum for UWB communication system ranges from 3.1-to-10.6GHz, which is divided into 14 bands, each of 528MHz bandwidth, and categorized into 5 groups [1]. To meet the stringent frequency hopping time requirement (<9.5ns), several frequency synthesizers based on singlesideband (SSB) frequency mixing are proposed recently [2-4]. Nevertheless, these architectures require multiple PLLs [2] or sophisticated dividers [2,3] to provide adequate sub-harmonics for the full-band frequency synthesis. The only one capable of covering 14-band carrier generation in the literature requires 3stage cascaded SSB mixers in the signal chain [2]. As a consequence, they are susceptible to in-band spurs generation, harmonic pulling, and encounter difficulties in I/Q-carrier generation. In contrast to the prior arts, this paper proposes a 14-band CMOS I/Q frequency synthesizer based on a single-PLL architecture.

👥 作者与机构

Tai-You Lu, Wei-Zen Chen

National Chiao Tung University, Hsinchu, Taiwan