An LTE SAW-Less Transmitter Using 33% Duty-Cycle LO Signals for Harmonic Suppression

📋 论文概要

该论文提出一种无SAW滤波器的LTE发射机，利用33%占空比本振信号抑制发射频谱中的谐波，从而降低了对额外滤波器的需求。解决了LTE系统对带外发射严格限制下的谐波干扰问题，提高了集成度和能效。

💡 主要创新点

• 采用33%占空比的本振信号，通过独特的混频器设计有效抑制三次、五次等奇次谐波。
• 在不使用外部SAW滤波器的情况下实现LTE发射机的谐波抑制，降低了成本与面积。

🏷 关键词

📄 原文摘要

With limited frequency allocation in the radio spectrum, spectral efficiency has always been the core development of communication systems. To accommodate the increase in demand for wireless data services, RF systems have been challenged to provide better in-channel SNR (EVM) and lower out-of-channel emission. As performance requirements become more stringent, second-order RF circuit impairments, that were previously insignificant, have become major design considerations. One example is the Long-Term-Evolution (LTE) [1]. Compared with previous generations, channel bandwidth has been expanded to 9MHz in most of the sub-GHz bands and 18MHz in the GHz bands. For spectral efficiency, the TX OFDM subcarriers are grouped into Resource Blocks (RBs) that can be dynamically allocated within the channel bandwidth. Noise and spurious emission requirements have become more challenging in the sub-GHz

👥 作者与机构

Yen-Horng Chen1, Neric Fong2, Bing Xu3, Caiyi Wang3

MediaTek, Hsinchu, Taiwan, 2MediaTek, San Jose, CA, 3MediaTek, Austin, TX